Environmental and Experimental Botany最新文献

{"title":"PagbZIP75 decreases the ROS accumulation to enhance salt tolerance of poplar via the ABA signaling","authors":"Jia Hu ,&nbsp;Siyuan Nan ,&nbsp;Lieding Zhou ,&nbsp;Changhong Yu ,&nbsp;Yajing Li ,&nbsp;Kai Zhao ,&nbsp;Shuhui Du ,&nbsp;Youzhi Han ,&nbsp;Shengji Wang","doi":"10.1016/j.envexpbot.2024.106051","DOIUrl":"10.1016/j.envexpbot.2024.106051","url":null,"abstract":"<div><div>Poplar (<em>Populus</em> L.) is a fast-growing economic timber plant that is susceptible to salt stress. Here, <em>PagbZIP75</em> (<em>Potri.014G120800</em>), which was isolated from 84 K poplar and upregulated in response to salt treatment, was investigated by generating overexpression (OE) and repression (RNAi) transgenic lines to elucidate its role in poplar salt stress tolerance through molecular and physiological approaches. PagbZIP75 localized in the nucleus and cell membrane but lacked transcriptional activation activity in yeast cells. Expression pattern analysis revealed that <em>PagbZIP75</em> was induced by salt stress, peaking at 12 hours in roots and stems and 24 hours in leaves. Under salt stress, OE exhibited enhanced growth and a more robust root system compared to non-transgenic 84 K poplar (WT) and RNAi. DAB and NBT staining results demonstrated lower levels of reactive oxygen species (ROS) in OE leaves, alongwith reduced electrolyte leakage rate and superoxide anion (O₂^-) content, while the proline content and superoxide dismutase (SOD) activity were significantly elevated under salt stress. Based on the RNA-seq data, multilayered hierarchical gene regulatory network (ML-hGRN) around <em>bZIP75</em> was illustrated and indicated that <em>PagbZIP75</em> was induced by ABA hormone along with 10 salt-related co-expressed genes. Yeast one-hybrid (Y1H) experiments indicated the binding of PagAREB1 protein to the 0–208 bp upstream fragments of <em>PagbZIP75</em>, and dual luciferase assays (LUC) confirmed a negative interaction between AREB1 and bZIP75. Overall, this study provides a theoretical foundation for the enhancement of poplar salt tolerance by <em>PagbZIP75</em> through the reduction of ROS accumulation via ABA signaling.</div></div>","PeriodicalId":11758,"journal":{"name":"Environmental and Experimental Botany","volume":"228 ","pages":"Article 106051"},"PeriodicalIF":4.5,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142720401","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Light-nutrient interaction orchestrates leaf dynamics, nitrogen assimilation, and cellular energetics in Agastache rugosa (Fisch. & C.A.Mey.) Kuntze","authors":"Khairul Azree Rosli ,&nbsp;Azizah Misran ,&nbsp;Latifah Saiful Yazan ,&nbsp;Puteri Edaroyati Megat Wahab","doi":"10.1016/j.envexpbot.2024.106044","DOIUrl":"10.1016/j.envexpbot.2024.106044","url":null,"abstract":"<div><div>Light and nutrients are vital environmental factors shaping plant growth and metabolism, yet their interactive effects on leaf dynamics, nitrogen assimilation, and cellular energetics remain largely unexplored. We aimed to investigate these processes in <em>Agastache rugosa</em> (Fisch. &amp; C.A.Mey.) Kuntze under two light levels; high-light (HL, 0 % shade) and low-light (LL, 50 % shade) combined with four nutrient levels; low (NPK1, 40 mg kg⁻¹), moderate (NPK2, 80 mg kg⁻¹), high (NPK3, 120 mg kg⁻¹) and very high (NPK4, 160 mg kg⁻¹). High-light conditions and high-nutrient levels (HL-NPK3) synergistically enhanced leaf mass area by 44 % with net photosynthesis rates and nitrate reductase activity increasing by up to 17.62 ± 0.89 µmol CO₂ m⁻² s⁻¹ and 0.34 ± 0.02 μmol NO₂ cm⁻² h⁻¹ each. Low-light and moderate-nutrient levels (LL-NPK2) triggered a 42 % increase in specific leaf area and threefold higher photosynthetic nitrogen use efficiency. Unexpectedly, high-light and moderate-nutrient levels (HL-NPK2) elicited peak vacuolar H⁺-ATPase and H⁺-pyrophosphatase activities at 15.6 % and 53.1 % each. This study also found significant positive correlations between chlorophyll content, nitrate reductase (r = 0.62, P &lt; 0.01), and vacuolar H⁺-ATPase activity (r = 0.58, P &lt; 0.01), suggesting a mechanism for maintaining high photosynthetic capacity and efficient nitrogen assimilation. The clustering of leaf area index, specific leaf area, and photosynthetic nitrogen use efficiency (similarity of &gt; 70 %) suggests optimized leaf structure and nitrogen use in light-limited but nutrient-rich environments. Our findings show how <em>A</em>. <em>rugosa</em> adjusts its physiology in response to environmental conditions, with implications for understanding plant adaptation and improving cultivation practices.</div></div>","PeriodicalId":11758,"journal":{"name":"Environmental and Experimental Botany","volume":"229 ","pages":"Article 106044"},"PeriodicalIF":4.5,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745156","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Rocky soils alter the diurnal photosynthetic behavior of xerophytic species by regulating hydraulic properties","authors":"Xiulong Zhang ,&nbsp;Fanglan Li ,&nbsp;Lulu Xie ,&nbsp;Weikai Bao","doi":"10.1016/j.envexpbot.2024.106045","DOIUrl":"10.1016/j.envexpbot.2024.106045","url":null,"abstract":"<div><div>Functional relationships between photosynthetic behavior and hydraulic properties are essential to characterize plant drought adaptation strategies. However, little is known about such relationships in response to varying rock fragment content (RFC), which could induce severe soil water deficit. We evaluated the leaf hydraulic properties and the timing of diurnal depression of photosynthesis in three xerophytic shrub species grown under different RFC levels (0, 25, 50, 75 % v v⁻¹). We found that studied species grown in 25 % RFC soil conditions had higher leaf hydraulic conductance (<em>K</em>_leaf) and reached maximum photosynthetic rate (<em>A</em>_max) in the morning, while those grown in 75 % RFC soil conditions had lower <em>K</em>_leaf, but reached their <em>A</em>_max in the afternoon. In addition, species in 75 % RFC soil conditions also exhibited low leaf hydraulic vulnerability and narrow leaf hydraulic safety margins. Our results indicate that RFC modifies the diurnal gas exchange dynamics of xerophytic species by decreasing leaf hydraulic vulnerability and hydraulic safety margins. Specifically, species surviving in 75 % RFC soils are less vulnerable to drought induced water loss, and carbon assimilation depression were later than in 25 % or 0 % RFC soil conditions. However, when faced with severe drought, these species with latter CO₂ uptake depression are at higher risk of hydraulic failure, because their safety margins are relatively narrow. Our results contribute to the knowledge of drought adaptation strategies in xerophytic species native to dry-hot rocky mountains.</div></div>","PeriodicalId":11758,"journal":{"name":"Environmental and Experimental Botany","volume":"228 ","pages":"Article 106045"},"PeriodicalIF":4.5,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700706","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Physiological and biochemical changes induced by drought stress during the stem elongation and anthesis stages in the Triticum genus","authors":"Sumitra Pantha ,&nbsp;Benjamin Kilian ,&nbsp;Hakan Özkan ,&nbsp;Frederike Zeibig ,&nbsp;Michael Frei","doi":"10.1016/j.envexpbot.2024.106047","DOIUrl":"10.1016/j.envexpbot.2024.106047","url":null,"abstract":"<div><div>Drought stress negatively influences the growth, development, and grain yield of wheat by disrupting its morphological, physiological, and biochemical processes. This study examined the effects of drought stress during the stem elongation and anthesis developmental stages of species within the <em>Triticum</em> genus along with their drought adaptation mechanisms under fully watered and drought conditions. We tested the following two hypotheses: (1) drought tolerance mechanisms for osmotic and stomatal regulation that lead to oxidative stress are correlated between the stem elongation and anthesis stages and affect grain yield loss, and (2) compared with modern cultivars, wild wheat cultivars exhibit greater drought tolerance. To test these hypotheses, a greenhouse pot experiment was conducted using 17 genotypes of wild wheat relatives and landraces, with modern cultivars included for comparison. Drought stress was induced during the stem elongation and anthesis stages until the average soil moisture was approximately 15 % and 18 %, respectively, of the pot’s water holding capacity. The soil moisture was maintained at 80–90 % for the fully watered treatment. An examination of physiological and biochemical traits revealed that drought significantly reduced stomatal conductance (gsw) and relative water content (RWC) during both developmental stages. However, significant increases occurred in the malondialdehyde (MDA) content during both stages and in the proline content during the anthesis stage. Drought stress significantly decreased the number of days to heading and anthesis, indicating that drought escape occurs under severe drought stress. Furthermore, drought significantly decreased morphological and yield-related traits, with the greatest reduction (51 %) occurring in grain yield. Weakly significant positive associations of biochemical and some physiological traits between the stem elongation and anthesis stages partially confirmed our first hypothesis, whereas our results relating to the second hypothesis were inconclusive. We observed genotype-dependent responses to drought stress during both stages for various measured traits. No associations of RWC, proline, or MDA with grain yield were found. However, stomatal conductance was negatively correlated with grain yield under drought stress at the anthesis stage. Certain wild wheat genotypes and landraces exhibited drought avoidance, escape, and tolerance mechanisms, which positively contributed to grain yield. We identified <em>T. monococcum</em> subsp. <em>sinskajae</em>, <em>T. boeoticum</em> and <em>T. dicoccoides</em> as the most drought-tolerant genotypes. The findings of this study provide important insight for understanding the drought adaptation traits and their use in wheat breeding programs.</div></div>","PeriodicalId":11758,"journal":{"name":"Environmental and Experimental Botany","volume":"228 ","pages":"Article 106047"},"PeriodicalIF":4.5,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142703034","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analyses of the bHLH gene family in Populus trichocarpa reveal roles of four PtbHLHs in regulating the drought stress response","authors":"Haizhen Zhang ,&nbsp;Shuhan Ye ,&nbsp;Nan Wang,&nbsp;Ziping Xu,&nbsp;Shufang Gong","doi":"10.1016/j.envexpbot.2024.106046","DOIUrl":"10.1016/j.envexpbot.2024.106046","url":null,"abstract":"<div><div>As one of the largest families of transcription factors in plants, the basic helix-loop-helix (bHLH) transcription factor family regulates a wide range of functions in plants. However, little is known about the functions of bHLH family members in <em>Populus trichocarpa</em> during plant growth and in the response to drought stress. In our study, 190 <em>PtbHLH</em> genes were identified in the <em>P. trichocarpa</em> genome and classified into 21 groups. Analyses of microarray datasets showed that most <em>PtbHLH</em> members not only have multiple functions in poplar growth, but also respond rapidly to drought stress in the leaves or roots. We selected four genes, <em>PtbHLH35</em>, <em>PtbHLH121</em>, <em>PtbHLH137,</em> and <em>PtbHLH152,</em> which were highly expressed in leaves or roots under drought stress, for functional validation analyses. These genes encoded nucleus-localized bHLH transcription factors. Transient expression of <em>PtbHLH35</em>, <em>PtbHLH121,</em> and <em>PtbHLH152</em> in <em>P. trichocarpa</em> improved drought tolerance by activating the antioxidant system to eliminate reactive oxygen species and reduce the degree of cell damage in the leaves under drought stress. Overexpression of <em>PtbHLH137</em> improved drought tolerance by activating antioxidant enzymes in the roots to eliminate reactive oxygen species, and by increasing the abscisic acid content in the roots in response to drought stress. Together, our findings provide insights into the functions of <em>PtbHLH</em> family members in growth and in the response to drought.</div></div>","PeriodicalId":11758,"journal":{"name":"Environmental and Experimental Botany","volume":"228 ","pages":"Article 106046"},"PeriodicalIF":4.5,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142702577","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Assessing salt resilience in mustard: Growth, yield, tolerance indicators, and metabolite profiling to decipher the mechanism of salt tolerance in selected cultivars","authors":"Varisha Khan ,&nbsp;Noushina Iqbal ,&nbsp;Shahid Umar ,&nbsp;Sayeed Ahmad","doi":"10.1016/j.envexpbot.2024.106033","DOIUrl":"10.1016/j.envexpbot.2024.106033","url":null,"abstract":"<div><div>Salt stress is a major constraint on agricultural productivity, particularly affecting crop growth and yield. This study aims to evaluate salt resilience in mustard (<em>Brassica juncea</em>) by investigating variations in growth, yield, and physiological tolerance indicators among selected cultivars. Advanced analytical techniques, including Near-Infrared Spectroscopy (NIRS) and Gas Chromatography-Mass Spectrometry (GC-MS) profiling, were employed to decipher the mechanisms underlying salt tolerance. NIRS was utilized for its rapid, non-destructive analysis of biochemical variations among the cultivars, while GC-MS profiling provided a detailed understanding of the metabolomic changes induced by salt stress. This integrated approach enabled the identification of crucial metabolites and biomarkers associated with salt tolerance and yield enhancement. The results indicated significant cultivar-specific differences in metabolic profiles which correlated with growth and yield (pod number, pod length,pod biomass, seed number and seed weight) under salt stress. The most resilient cultivar demonstrated increased accumulation of osmoprotectants, antioxidants, and other stress-related metabolites. These findings underscore the importance of specific traits and metabolites in conferring salt tolerance.</div><div>This comprehensive study offers valuable insights for breeding programs aimed at developing salt-tolerant mustard cultivars, thereby contributing to sustainable agriculture in saline environments.</div></div>","PeriodicalId":11758,"journal":{"name":"Environmental and Experimental Botany","volume":"228 ","pages":"Article 106033"},"PeriodicalIF":4.5,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700707","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Field versus controlled environmental experiments to evaluate the heat stress response of barley (Hordeum vulgare L.)","authors":"Ádám Horváth ,&nbsp;Zita Berki ,&nbsp;Krisztina Balla ,&nbsp;Judit Bányai ,&nbsp;Marianna Mayer ,&nbsp;András Cseh ,&nbsp;Tibor Kiss ,&nbsp;Ildikó Karsai","doi":"10.1016/j.envexpbot.2024.106038","DOIUrl":"10.1016/j.envexpbot.2024.106038","url":null,"abstract":"<div><div>The complexity of heat stress hinders both the exploration of the genetic basis of stress response and breeding of genotypes with increased stress tolerance. Our main goal was to analyze and compare the possibilities of evaluating heat stress responses of barley cultivars in field sowing and controlled environmental experiments. For this purpose, a four-year field-sown experiment was carried out at one location in a panel of 190 winter and facultative barleys. In parallel, a subset of 28 cultivars were included into controlled environmental tests, where their reactions were determined to single heat stress treatment applied at heading and to combined heat stresses applied at first node appearance and then at heading. Based on the grain-yield related parameters, seven distinct clusters of the cultivars could be established with specific reaction patterns across the years. There was one year with close to optimal weather conditions and one year, when heat stress occurred during flowering and grain setting, making it possible to evaluate the heat stress responses of the 190 barley genotypes. In the heat stress prone 2022 year, the general trends were a strong reduction in the reproductive tiller number and a slight reduction in the fertility. In several groups, these negative effects were compensated with significant increases in grain number per ears and with strong increases in the average grain weight. Under controlled conditions, heat stress significantly reduced most of the grain-yield related traits. Among the more tolerant genotypes, two basic response types could be distinguished. One group was able to better preserve the grain number and weight in the main ear under heat stress, while the other was more able to allocate resources into the side tillers during the recovery period. In the combined heat stress, the average trait values were similar to those in the single stress or even lower, and there was no general priming effect clearly detectable. In the case of the 28 genotypes, there were significant correlations between the stress-induced changes in grain-yield related traits measured under field and under controlled conditions, underlining the possibility of combining the information originating from the two different environments.</div></div>","PeriodicalId":11758,"journal":{"name":"Environmental and Experimental Botany","volume":"228 ","pages":"Article 106038"},"PeriodicalIF":4.5,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700577","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A novel NAC transcription factor from Haloxylon ammodendron promotes reproductive growth in Arabidopsis thaliana under drought stress","authors":"Jianshun Liang ,&nbsp;Xiashun Liu ,&nbsp;Lei Xu ,&nbsp;Rongbo Mu ,&nbsp;Nengshuang Shen ,&nbsp;ShanShan Li ,&nbsp;Cong Cheng ,&nbsp;Yanping Ren ,&nbsp;Li Ma ,&nbsp;Bo Wang ,&nbsp;Zhengpei Yao ,&nbsp;Hua Zhang","doi":"10.1016/j.envexpbot.2024.106043","DOIUrl":"10.1016/j.envexpbot.2024.106043","url":null,"abstract":"<div><div>Maintaining the growth of reproductive branches during the summer is crucial for the seed setting of the perennial xerophytic plant <em>H. ammodendron</em> (<em>Haloxylon ammodendron</em>). In this study, we screened and cloned the NAC transcription factor <em>HaNAC12</em> from the transcriptomes of different tissue of the desert plant <em>H. ammodendron</em> and from the transcriptome of seedlings under drought stress. Real-time quantitative fluorescence analysis showed that the expression level of <em>HaNAC12</em> in reproductive branches was higher than that in vegetative branches. It was able to respond to treatments of drought, high salinity and low-temperature stress, as well as to the external induction of plant hormones such as IAA, ABA, SA and MeJA. The GFP- <em>HaNAC12</em> fusion protein localized to the nucleus of tobacco epidermal cells. Heterologous expression of <em>HaNAC12</em> revealed that the transgenic <em>Arabidopsis</em> exhibited enhanced drought resistance and showed early flowering after natural drought stress, promoting reproductive growth. Transcriptomic analysis indicated that fatty acid metabolic pathways were upregulated in transgenic <em>Arabidopsis thaliana</em>. DNA affinity purification analysis showed that HANAC12 binds to elements in the downstream target genes primarily associated with the linoleic acid metabolic pathway. The total fatty acid content in the reproductive branches of transgenic <em>Arabidopsis</em> and <em>H. ammodendron</em> is greater than that in the wild-type <em>Arabidopsis</em> and the vegetative branches of <em>H. ammodendron</em>. Under drought stress, plants can adapt to arid conditions by increasing the proportion of unsaturated fatty acids, thereby enhancing membrane fluidity, reducing membrane damage, and maintaining the requirements for cell division and growth. Therefore, <em>HaNAC12</em> may improve the drought resistance of <em>Arabidopsis</em> and promote reproductive growth under drought stress by regulating fatty acid metabolism.</div></div>","PeriodicalId":11758,"journal":{"name":"Environmental and Experimental Botany","volume":"228 ","pages":"Article 106043"},"PeriodicalIF":4.5,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700709","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Grafting semi-wild tomato GZ-05 rootstocks improved cold tolerance via the signalling of melatonin and jasmonic acid","authors":"Jianming Wei ,&nbsp;Yunzhou Li ,&nbsp;Ping Tan ,&nbsp;Dalong Zhang ,&nbsp;Yan Liang","doi":"10.1016/j.envexpbot.2024.106042","DOIUrl":"10.1016/j.envexpbot.2024.106042","url":null,"abstract":"<div><div>Tomato (<em>Solanum lycopersicum</em>) cultivation in the off-season is significantly hindered by cold stress; hence, utilising stress-resistant rootstocks in grafting is a critical solution. This study used 30 semi-wild tomato GZ-05 plants as rootstocks and Ailsa Craig (AC) tomatoes as scions. After cold stress, the scion tolerance index, leaf ion permeability, and other physiological and biological indicators were used to determine the most tolerant plants. To understand the molecular basis of GZ-05 rootstock cold stress resistance, RNA sequencing and reverse transcription polymerase chain reaction techniques were used to compare the varying genes expressed in the grafted AC/GZ-05 and self-grafted AC/AC plant scion leaves. The results indicated that genes associated with melatonin (MT) and jasmonic acid (JA) production and their signalling pathways were considerably altered. The initial MT and JA levels in the GZ-05-grafted plant scions were high, and when they were exposed to cold stress, the amount of active MT and JA in AC/GZ-05 heterologous grafts were great. Using clustered regularly interspaced short palindromic repeats (CRISPR)/CRISPR-associated protein 9, we knocked out the MT synthesis gene (<em>SlCOMT14</em>) and JA synthesis gene (<em>SlLoxD</em>) and found that GZ-05 plant cold stress tolerance decreased. External tests were conducted to evaluate the GZ-05 <em>SlCOMT14</em> and <em>SlLoxD</em> knockout lines. Source spraying with MT and methyl jasmonate showed that knockout strain cold stress tolerance could be recovered. SlICE1, a tomato cold stress tolerance transcription factor, was silenced, resulting in decreased tolerance to MT- and JA-induced cold stress. The MT/JA-inducer of C-repeat binding factor (CBF) expression 1-CBF pathway may be the mechanism by which the semi-wild tomato GZ-05 rootstock confers cold tolerance to plants. This study has uncovered the molecular mechanism by which grafting semi-wild tomato GZ-05 rootstocks increases plant cold tolerance, thereby laying the groundwork for the utilisation of Guizhou's native semi-wild tomato germplasm resources.</div></div>","PeriodicalId":11758,"journal":{"name":"Environmental and Experimental Botany","volume":"228 ","pages":"Article 106042"},"PeriodicalIF":4.5,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700708","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Nutrient mediation of sink strength in the Orobanche minor – Red clover association","authors":"Mao Hattori,&nbsp;Clarissa Frances Frederica ,&nbsp;Louis John Irving","doi":"10.1016/j.envexpbot.2024.106041","DOIUrl":"10.1016/j.envexpbot.2024.106041","url":null,"abstract":"<div><div>Holoparasites are non-photosynthetic plants which derive all their growth requirements from their host plant and are thought to act as a very strong sink for host resources. Here, we grew red clover plants in split-root boxes to explore the effect of nutrient supply to <em>Orobanche minor</em> parasitized or unparasitized host roots. Where nutrients were supplied to parasitized roots, parasite growth was strongly promoted at the expense of the host. Conversely, host growth did not differ significantly from unparasitized controls where nutrients were supplied to unparasitized roots. While ¹⁵N labelling suggested both strong parasitic ammonium abstraction and reduced nitrate uptake in parasitized roots, the total N content of systems where nutrients were fed to parasitized roots was approximately 26 % higher than control plants, suggesting that changes in host and parasite growth rates were due to changes in sink strength, rather than nutrient uptake. Parasitism and nutrient supply had strong effects on leaf carbohydrate metabolism but did not affect photosynthetic rates or leaf N concentration. In the second experiment, we investigated the importance of light level on the host – parasite relationship, concluding that parasitism had a diminished effect on host growth under low light conditions. Total system mass was unaffected by the apparent sink strength of the parasite. Our results suggest a dynamic relationship between host shoot and parasite sink strengths, mediated by changes in nutrient status.</div></div>","PeriodicalId":11758,"journal":{"name":"Environmental and Experimental Botany","volume":"228 ","pages":"Article 106041"},"PeriodicalIF":4.5,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142654395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}