Functional Plant Biology最新文献

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Photochemical and non-photochemical chlorophyll fluorescence dynamics in reproductive structures of semi-arid rangeland perennial bunchgrasses. 半干旱草原多年生束草生殖结构的光化学和非光化学叶绿素荧光动态。
IF 2.9 4区 生物学
Functional Plant Biology Pub Date : 2026-04-24 DOI: 10.1071/FP25308
Erik P Hamerlynck, Rory C O'Connor
{"title":"Photochemical and non-photochemical chlorophyll fluorescence dynamics in reproductive structures of semi-arid rangeland perennial bunchgrasses.","authors":"Erik P Hamerlynck, Rory C O'Connor","doi":"10.1071/FP25308","DOIUrl":"10.1071/FP25308","url":null,"abstract":"<p><p>Photosynthesis by flag leaves and florets supporting reproductive development and seed provisioning is critical to North American sagebrush steppe bunchgrass populations that rely exclusively on sexual reproduction. How reproductive structures vary between species in ability to dissipate excess light energy has not been established. To address this, we determined optimal (Fv/Fm) and light-adapted (φPSII) PSII quantum yield and regulated (φNPQ) and non-regulated (φNO) PSII non-photochemical quantum yields of flag leaves, and basal and distal florets of the exotic crested wheatgrass (Agropyron cristatum) and the native bluebunch wheatgrass (Psudoroegnaria spicata) in the field over reproductive period. The species differed in φNPQ primarily in basal and distal florets, with higher φNPQ in bluebunch wheatgrass concurrent with lower Fv/Fm and φPSII compared to crested wheatgrass. Fv/Fm was also lower in bluebunch wheatgrass flag leaves, but with concurrent higher φNO, not φNPQ. Species divergence in floret photochemical and non-photochemical parameters resulted from changes in bluebunch wheatgrass over the post-anthesis grain filling period, while crested wheatgrass performance was consistent over the reproductive period. These results demonstrate that crested wheatgrass, which is better capable of consistently producing viable seed cohorts, possesses physiological mechanisms that more effectively protect PSII functional integrity.</p>","PeriodicalId":12483,"journal":{"name":"Functional Plant Biology","volume":"53 4","pages":""},"PeriodicalIF":2.9,"publicationDate":"2026-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147689228","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Selenium nanoparticles as a rooting agent of rice plants to tolerate low phosphate stress. 纳米硒对水稻低磷胁迫生根的影响。
IF 2.9 4区 生物学
Functional Plant Biology Pub Date : 2026-04-24 DOI: 10.1071/FP25225
Nga T P Mai, Van Phuong Nguyen, Minh Khue Nguyen, The Khue Nguyen, Dang Luong Nguyen, Dinh Khiem Nguyen, Thi Kim Anh Le, Huong Thi Mai To, Thi Van Anh Le, Thi Kieu Oanh Nguyen, Thi Huong Le
{"title":"Selenium nanoparticles as a rooting agent of rice plants to tolerate low phosphate stress.","authors":"Nga T P Mai, Van Phuong Nguyen, Minh Khue Nguyen, The Khue Nguyen, Dang Luong Nguyen, Dinh Khiem Nguyen, Thi Kim Anh Le, Huong Thi Mai To, Thi Van Anh Le, Thi Kieu Oanh Nguyen, Thi Huong Le","doi":"10.1071/FP25225","DOIUrl":"10.1071/FP25225","url":null,"abstract":"<p><p>Nanoparticles offer promising applications in agriculture due to their unique physicochemical properties. This study investigated selenium nanoparticles (SeNPs) as a rooting agent to improve rice tolerance to low phosphate stress. IR64 rice was grown in media with varying SeNP concentrations (0-25 ppm), and plants were analyzed at 2 and 6 weeks for phenotypic traits, histology, biochemistry, and gene expression. At 2 weeks, 25 ppm SeNPs led to a threefold increase in root length versus untreated controls. Histological analysis revealed increased root perimeter and diameter, along with reduced aerenchyma perimeter. After 6 weeks under phosphate starvation, SeNP-treated plants showed higher phosphate and selenium content in roots and shoots, increased shoot length and weight, and reduced root length, weight, and phenolic content. Gene expression analysis showed that SeNPs upregulated key phosphate deficiency response genes, including OsPAP21, OsPT9, OsSPX, and OsPHR2. The most dramatic change was observed in OsSPX expression, which increased nearly 250-fold in shoots under full phosphate conditions. This is the first study to demonstrate that SeNPs promote root growth, enhance phosphate uptake, and regulate gene expression, suggesting SeNPs may serve as a sustainable strategy to boost phosphate use efficiency in rice cultivation.</p>","PeriodicalId":12483,"journal":{"name":"Functional Plant Biology","volume":"53 4","pages":""},"PeriodicalIF":2.9,"publicationDate":"2026-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147573282","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Reducing drought stress in rice (Oryza sativa L.) through silicon-induced improvements in photosynthetic pigments, leaf gas exchange, biomass, and antioxidant activities. 通过硅诱导水稻光合色素、叶片气体交换、生物量和抗氧化活性的改善来减轻干旱胁迫。
IF 2.9 4区 生物学
Functional Plant Biology Pub Date : 2026-04-24 DOI: 10.1071/FP25317
Thi Thi Myint, Pratibha Rawat, Myint Aye, Nyo Mar Htwe, Bhupendra Mathpal, Deepti Shankhdhar, Shailesh Chandra Shankhdhar
{"title":"Reducing drought stress in rice (Oryza sativa L.) through silicon-induced improvements in photosynthetic pigments, leaf gas exchange, biomass, and antioxidant activities.","authors":"Thi Thi Myint, Pratibha Rawat, Myint Aye, Nyo Mar Htwe, Bhupendra Mathpal, Deepti Shankhdhar, Shailesh Chandra Shankhdhar","doi":"10.1071/FP25317","DOIUrl":"10.1071/FP25317","url":null,"abstract":"<p><p>Drought impacts sustainable crop production by disrupting the fundamental metabolic processes of plants leading to reduced photosynthesis, leaf gas exchange, and oxidative damage. Silicon can mitigate the negative consequences of water stress. In a field experiment in 2020 and 2021, we applied silicon foliar spray to rice (Oryza sativa L.) genotypes at different growth stages (tillering, panicle initiation, 50% flowering, and milky stage) to determine how silicon can enhances water stress tolerance. Almost all measured parameters increased with silicon across the rice genotypes. When compared with control, silicon-treated plants had higher total chlorophyll (increased by 13.12% in genotype US-312 in 2020; and 11.3% in genotype 27P63 in 2021) and contents of chlorophyll a (increased by 11.2% in US-312) and chlorophyll b (increased by 11.5% in 27P63), total dry matter (increased by 23.53% in genotype IIRRH-143), photosynthetic rate (increased by 15.0% in genotype US-312), total dry matter (increased by 23.53% in genotype IIRRH-143), stomatal conductance (increased 28.34% in genotype 27P63 and 19.35% in genotype US-312), and transpiration rate (increased 3.97% in genotype DRR Dhan-48 at flowreing; 7.77% in genotype IIRRH-143 by 7.77% at anthesis). Intercellular CO2 concentration and proline content was also enhanced with silicon application. Intercellular CO2 concentration increased 25.83% in genotype IIRRH-143, and proline content increased 37.95% in genotype DRR Dhan-48 in 2020, and increased 33.72% in genotype US-314 in 2021. The antioxidant superoxide dismutase was also increased. Our findings show that silicon application alleviated the adverse effects of drought stress, and may be a strategy for mitigating drought stress for rice production in water-deficit conditions.</p>","PeriodicalId":12483,"journal":{"name":"Functional Plant Biology","volume":"53 4","pages":""},"PeriodicalIF":2.9,"publicationDate":"2026-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147768030","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Transcriptomic and metabolomic insights into high-temperature acclimation mechanisms of Anoectochilus roxburghii. 刺梨高温驯化机制的转录组学和代谢组学研究。
IF 2.9 4区 生物学
Functional Plant Biology Pub Date : 2026-04-24 DOI: 10.1071/FP25109
Shuhe Zhang, Haiming Li, Hui Zou, Heping Li, Jiangbo Lin, Yimin Dai
{"title":"Transcriptomic and metabolomic insights into high-temperature acclimation mechanisms of Anoectochilus roxburghii.","authors":"Shuhe Zhang, Haiming Li, Hui Zou, Heping Li, Jiangbo Lin, Yimin Dai","doi":"10.1071/FP25109","DOIUrl":"10.1071/FP25109","url":null,"abstract":"<p><p>Anoectochilus roxburghii (A. roxburghii) is a valuable herb in traditional Chinese medicine, valued for its medicinal properties. Wild A. roxburghii is rare and requires specific environmental conditions, making artificial cultivation challenging. High-temperature acclimation in plants - physiological and biochemical adjustments to tolerate elevated temperatures - has practical applications in agriculture. Our previous study showed that high-temperature acclimation enhances the heat tolerance of the A. roxburghii accession 'Meihuashan', though the molecular basis remains unclear. In this study, we conducted transcriptomic and metabolomic analyses on control (CK), 3-day high-temperature acclimated (T1, 35°C), and 4-day high-temperature acclimated (T2, 35°C) 'Meihuashan' plants. RNA sequencing identified 79,086 unigenes and 12,404 protein-coding genes. Gene ontology and pathway enrichment analyses revealed that metabolic pathways were significantly enriched in the high-temperature response. Subsequent untargeted metabolomic analysis detected 1014 metabolites in the high-temperature treatment group, with 157 differentially expressed metabolites. Orthogonal partial least square-discriminant analysis revealed differentially expressed metabolites associated with flavone, phenylpropanoid, and alkaloid biosynthesis, along with amino acid, lipid, and carbohydrate metabolism. Integrated analysis further highlighted the central role of the carbon fixation pathway, in which key enzyme-encoding genes (e.g. PCK1, GOT2, ALDOA, TPI1) and their corresponding metabolites exhibited significant co-variation under high-temperature stress. These findings suggest that metabolic changes involving amino acids, lipids, and carbohydrates may play a key role in the high-temperature acclimation of 'Meihuashan'.</p>","PeriodicalId":12483,"journal":{"name":"Functional Plant Biology","volume":"53 4","pages":""},"PeriodicalIF":2.9,"publicationDate":"2026-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147722397","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Water deficit induced by polyethylene glycol leads to the depletion of phenolic compounds but did not alter lignification in roots of Scots pine (Pinus sylvestris). 聚乙二醇引起的水分亏缺导致酚类化合物的消耗,但不改变苏格兰松(Pinus sylvestris)根的木质素化。
IF 2.9 4区 生物学
Functional Plant Biology Pub Date : 2026-04-24 DOI: 10.1071/FP26003
Yury V Ivanov, Alexander V Kartashov, Alexandra I Ivanova, Galina V Glushko, Vladimir V Kuznetsov
{"title":"Water deficit induced by polyethylene glycol leads to the depletion of phenolic compounds but did not alter lignification in roots of Scots pine (Pinus sylvestris).","authors":"Yury V Ivanov, Alexander V Kartashov, Alexandra I Ivanova, Galina V Glushko, Vladimir V Kuznetsov","doi":"10.1071/FP26003","DOIUrl":"10.1071/FP26003","url":null,"abstract":"<p><p>Global climate change is accompanied by an increase in the frequency and severity of droughts, which negatively impact plant growth. One of the protective mechanisms that allows plants to withstand the negative drought effects is the lignification of vascular and dermal tissues, which prevents water loss. Despite some progress in research on lignification in model and crop plants, the characteristics of lignin accumulation in conifers need further investigation. In this study, we examined the adaptation of Scots pine (Pinus sylvestris) seedlings to water deficit at weak (-0.15 MPa) and strong (-0.5 MPa) intensities induced by polyethylene glycol 6000. Our results showed that water deficit did not cause oxidative stress in the seedlings. The most significant effect of water deficit was the depletion of phenolic compounds (flavonoids, catechins, and proanthocyanidins) in seedling roots during the stress imposition period, despite no changes in the phenolic content of the needles. In this context, the lignin content in plant roots was maintained at a level comparable to that of the control. These findings indicate that root lignification in Scots pine seedlings is a stress-resistant process that is important for protecting roots under drought conditions.</p>","PeriodicalId":12483,"journal":{"name":"Functional Plant Biology","volume":"53 4","pages":""},"PeriodicalIF":2.9,"publicationDate":"2026-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147498085","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Non-coding RNAs as convergent control hubs integrating abiotic and biotic stress responses in crops. 非编码rna作为整合作物非生物和生物胁迫反应的收敛控制枢纽。
IF 2.9 4区 生物学
Functional Plant Biology Pub Date : 2026-04-24 DOI: 10.1071/FP25345
Aiman Hina, Mirza Naveed Shahzad, Ahtsham Ul Hassan, Tayyaba Sanaullah, Muhammad Tehseen Azhar, Madiha Habib, Muhammad Faheem Khan, Rana Muhammad Ateeq Ahmad, Usman Aslam, Usman Khalique, Aleksandra O Utkina, Asim Abbasi
{"title":"Non-coding RNAs as convergent control hubs integrating abiotic and biotic stress responses in crops.","authors":"Aiman Hina, Mirza Naveed Shahzad, Ahtsham Ul Hassan, Tayyaba Sanaullah, Muhammad Tehseen Azhar, Madiha Habib, Muhammad Faheem Khan, Rana Muhammad Ateeq Ahmad, Usman Aslam, Usman Khalique, Aleksandra O Utkina, Asim Abbasi","doi":"10.1071/FP25345","DOIUrl":"10.1071/FP25345","url":null,"abstract":"<p><p>Non-coding RNAs (ncRNAs) have emerged as central regulators of how plants perceive, integrate, and respond to environmental and biological challenges. Once regarded as transcriptional noise, diverse ncRNA classes, including microRNAs (miRNAs), small interfering RNAs (siRNAs), long non-coding RNAs (lncRNAs), circular RNAs (circRNAs), enhancer RNAs (eRNAs), and piwi-interacting RNA (piRNAs), are now recognized as powerful modulators of gene regulatory networks that shape stress signalling, developmental plasticity, and immune competence. Acting across epigenetic, transcriptional, and post-transcriptional levels, ncRNAs orchestrate chromatin remodelling, RNA stability, redox homeostasis, and hormone signalling to balance growth and defense. This review synthesizes evidence that ncRNA-mediated regulation is highly convergent: identical ncRNA modules are repeatedly recruited across abiotic and biotic stresses and funnel diverse signals through shared regulatory nodes involving hormone networks, reactive oxygen species, and master transcriptional hubs. We highlighted how redox-ncRNA feedback loops, chromatin-embedded ncRNA activity, and cross-layer interactions among miRNAs, siRNAs, lncRNAs, and circRNAs generate synergistic control over stress responses. This review further discusses how ncRNAs encode stress memory and priming, enabling plants to respond more efficiently to recurrent challenges, while also imposing regulatory trade-offs that constrain growth, development, and yield. Despite rapid discovery, ncRNA research remains limited by incomplete mechanistic validation, uncertain epigenetic stability, weak integration with systems biology, and unresolved biosafety and regulatory issues. Addressing these barriers will be essential for translating ncRNA biology into predictive and deployable strategies. By leveraging their capacity to unify signalling and adaptive regulation, ncRNAs represent promising molecular entry points for developing resilient, climate-ready crops.</p>","PeriodicalId":12483,"journal":{"name":"Functional Plant Biology","volume":"53 4","pages":""},"PeriodicalIF":2.9,"publicationDate":"2026-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147722432","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Expression of VvNLRs in Arabidopsis thaliana activates defense-responsive pathways to counter biotic stress. VvNLRs在拟南芥中的表达激活防御反应途径以对抗生物胁迫。
IF 2.9 4区 生物学
Functional Plant Biology Pub Date : 2026-04-24 DOI: 10.1071/FP25385
Naina Garewal, Neetu Goyal, Jaishree, Monika Bhuria, Nandni Goyal, Hanny Chauhan, Kashmir Singh
{"title":"Expression of VvNLRs in Arabidopsis thaliana activates defense-responsive pathways to counter biotic stress.","authors":"Naina Garewal, Neetu Goyal, Jaishree, Monika Bhuria, Nandni Goyal, Hanny Chauhan, Kashmir Singh","doi":"10.1071/FP25385","DOIUrl":"10.1071/FP25385","url":null,"abstract":"<p><p>Powdery mildew, caused by Erysiphe necator, is a major fungal disease affecting grapevines, leading to significant yield and quality losses. Plants defend against pathogens through pattern-triggered immunity (PTI) and effector-triggered immunity (ETI), with nucleotide-binding leucine-rich repeat receptors (NLRs) playing a crucial role in ETI. Hormonal signaling pathways, including salicylic acid (SA), jasmonic acid (JA), and ethylene (ET), further regulate immune responses. This study functionally characterizes two NLR genes (XP_010660247.1 and XP_003633889.1) responsive to powdery mildew in Arabidopsis thaliana. Using transgenic plants overexpressing these genes individually and in combination, we analyzed their expression patterns in response to E. necator infection and various phytohormones. Real time analysis demonstrated varied tissue-specific expression profiles across all transgenic lines. XP_010660247.1 lines exhibited early and sustained immune response post E. necator infection, indicating robust activation of the SA pathway. XP_003633889.1 lines showed delayed but prolonged activation of SA pathway genes, suggesting nuanced temporal dynamics in fungal resistance. Stacked NLR lines showed further delay in activation of SA pathway genes possibly due to mutual cross-interference in gene activation. Enhanced JA/SA pathway activation indicates heightened defense against biotic stress response. Crosstalk between JA and abscisic acid (ABA) pathways was evidenced by MYC2 upregulation in response to methyl jasmonate and ABA treatments. The ET pathway demonstrated nuanced activation with sensitivity to ET elicitor 1-aminocyclopropane-1-carboxylic acid but the inability to further activate the ET pathway in transgenic lines. Our findings provide insights into plant immune mechanisms and offer potential strategies for engineering powdery mildew-resistant grapevine varieties.</p>","PeriodicalId":12483,"journal":{"name":"Functional Plant Biology","volume":"53 4","pages":""},"PeriodicalIF":2.9,"publicationDate":"2026-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147498069","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Morphological-physiological responses of three species of Agropyron to drought stress in Xinjiang, China. 新疆三种稻草对干旱胁迫的形态生理响应
IF 2.9 4区 生物学
Functional Plant Biology Pub Date : 2026-03-20 DOI: 10.1071/FP25179
Yuqing Wang, Juan Qiu, Yan Meng, Qian Li
{"title":"Morphological-physiological responses of three species of Agropyron to drought stress in Xinjiang, China.","authors":"Yuqing Wang, Juan Qiu, Yan Meng, Qian Li","doi":"10.1071/FP25179","DOIUrl":"10.1071/FP25179","url":null,"abstract":"<p><p>Agropyron species are recognized as pivotal components of arid grasslands because they supply drought-resistant forage and support ecosystem recovery. To systematically evaluate the drought resistance of this genus, this study examined 13 populations of Agropyron species (three populations of Agropyron cristatum, six populations of Agropyron cristatum var. pectinatum, and four populations of Agropyron mongolicum) under three soil moisture gradients (80%, 50%, and 30% of field capacity) at the seedling stage. A multi-dimensional assessment framework was constructed by integrating morphological and physiological traits using a membership function model and grey relational analysis. The results indicated that drought stress significantly increased root length by 21.54%, leaf water content by 12.99%, and proline accumulation by 31.56%. Agropyron species mitigate desertification through key drought survival strategies, including stomatal regulation, osmoprotectant accumulation, and enhanced antioxidant activity. Based on the membership function scores, the species drought tolerance was ranked as A. cristatum > A. mongolicum > A. cristatum var. pectinatum. These findings establish quantitative criteria for selecting drought-resistant germplasm and reveal the phenotypic plasticity strategies in Triticeae. Moreover, they indicate that A. cristatum represents a key scientific resource for ecological stabilization and desertification control in the arid regions of Xinjiang.</p>","PeriodicalId":12483,"journal":{"name":"Functional Plant Biology","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2026-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146046137","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Carbon isotope composition of soluble sugars in leaves of C3 and C4 grasses. C3和C4禾草叶片可溶性糖的碳同位素组成。
IF 2.9 4区 生物学
Functional Plant Biology Pub Date : 2026-03-20 DOI: 10.1071/FP25356
Walter Krystler Israel, Hilary Stuart-Williams, Oula Ghannoum
{"title":"Carbon isotope composition of soluble sugars in leaves of C3 and C4 grasses.","authors":"Walter Krystler Israel, Hilary Stuart-Williams, Oula Ghannoum","doi":"10.1071/FP25356","DOIUrl":"10.1071/FP25356","url":null,"abstract":"<p><p>This study examined the carbon isotope composition (δ13C) of soluble sugars (glucose, fructose, sucrose) and cellulose in leaves of C3 and C4 grasses, including NAD-ME and NADP-ME subtypes, grown under controlled conditions. Using a novel compound-specific isotope analysis, we investigated post-photosynthetic fractionation and its relationship to stomatal conductance and intrinsic water-use efficiency (WUEi). C3 species were more 13C-depleted than C4 species due to differences in photosynthetic pathways. In C3 grasses, sucrose, glucose, and cellulose were enriched in 13C relative to bulk tissue, while fructose was more depleted, likely reflecting isotope discrimination by invertase. In C4 grasses, all sugars were more enriched in 13C than bulk tissue, especially sucrose. This pattern reflects the spatial separation of sugar synthesis and transport between mesophyll and bundle sheath cells, causing isotopic shifts during transport and metabolic cycling. Fructose and glucose δ13C showed opposite discrimination patterns between NADP ME and NAD ME species, indicating subtype specific differences in carbohydrate processing, including sucrose turnover and invertase related fractionation. These contrasting signals highlight key metabolic divergence between C4 subtypes with sucrose δ13C unchanged across subtypes. Across C4 grasses, δ13C did not correlate with WUEi, confirming that the CO2-concentrating mechanism decouples δ13C from Anet. However, bulk leaf and cellulose δ13C correlated negatively with stomatal conductance (gs), indicating that δ13C reflects long-term gs rather than instantaneous gas exchange. Thus, δ13C can indicate integrated stomatal behavior but not WUEi. This study provides the first compound-specific δ13C evidence of metabolic divergence between photosynthetic types and C4 subtypes. Fructose versus glucose emerged as key metabolites for tracing differences in carbohydrate metabolism, offering new potential for improving crop water-use efficiency through isotopic and genetic screening.</p>","PeriodicalId":12483,"journal":{"name":"Functional Plant Biology","volume":"53 3","pages":""},"PeriodicalIF":2.9,"publicationDate":"2026-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147467544","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Role of non-structural carbohydrates in the sustainable production of apples (Malus domestica). 非结构性碳水化合物在苹果可持续生产中的作用
IF 2.9 4区 生物学
Functional Plant Biology Pub Date : 2026-03-20 DOI: 10.1071/FP25232
Reema Prakash, Oluyoye Idowu, Bruno Holzapfel, Xinyi Zhang, Jason P Smith, Joanne R Ashnest
{"title":"Role of non-structural carbohydrates in the sustainable production of apples (Malus domestica).","authors":"Reema Prakash, Oluyoye Idowu, Bruno Holzapfel, Xinyi Zhang, Jason P Smith, Joanne R Ashnest","doi":"10.1071/FP25232","DOIUrl":"10.1071/FP25232","url":null,"abstract":"<p><p>Consistent yield and production of high-quality fruits are key drivers for sustainable apple industry. Flowering and fruiting in apple (Malus domestica) can be limited by non-structural carbohydrates. Apples flower profusely, and as strong sinks, both flowers and fruits compete with vegetative parts of the tree for carbohydrate allocation. Low sugar availability results in inconsistent blooms and regular cropping disruptions, leading to low yields and substantial economic losses. Various crop thinning strategies are used to reduce crop load and improve carbohydrate allocation for better fruit quality and return bloom. The implementation times of these strategies in the current season can significantly alter the sugar balance, affecting flower formation in the following season. This review examines various roles of non-structural carbohydrates in apple tree physiology, with a focus on flower and fruit development. It appraises the fundamentals of effective carbohydrate management for achieving long-term sustainability in apple production. A dual carbon transport system in apples ensures a more stable and efficient supply of sugars to the sinks and enables carbohydrates to perform essential roles in signalling, structural support during flower formation, floral metabolism, pollination, fruit set, fruit development, fruit metabolism, and fruit quality enhancement. Understanding the vital functions of carbohydrates in tree dormancy, flowering, and fruiting calls for a more efficient implementation of fruit thinning strategies at the earliest possible time during the reproductive phase.</p>","PeriodicalId":12483,"journal":{"name":"Functional Plant Biology","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2026-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146124546","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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