Plant Biology最新文献_第7页

Effects of cotyledon removal on the root growth and physiology properties during early seedling stage of Ricinus communis under salt stress. 盐胁迫下去除子叶对蓖麻幼苗早期根系生长及生理特性的影响

IF 3.4 3区生物学

Plant Biology Pub Date : 2026-08-01 Epub Date: 2026-06-02 DOI: 10.1111/plb.70235

X Deng, R Lin, H Liu, L Pan, Y Li, S Mao, S Yu, J Lin

{"title":"Effects of cotyledon removal on the root growth and physiology properties during early seedling stage of Ricinus communis under salt stress.","authors":"X Deng, R Lin, H Liu, L Pan, Y Li, S Mao, S Yu, J Lin","doi":"10.1111/plb.70235","DOIUrl":"10.1111/plb.70235","url":null,"abstract":"Castor (Ricinus communis L.) is an important oilseed crop species that demonstrates strong adaptability to saline-alkaline conditions. Early seedling development is the most vulnerable period to salinity stress during plant establishment. Cotyledons, as the earliest emerging photosynthetic organs, play a crucial role in supporting seedling establishment and contributing to salt stress tolerance. However, the effects of cotyledon removal (CR) on root adaptive strategies and physiological regulation under salt stress remain unclear. Here, the growth, root ultrastructure, ion homeostasis, antioxidant defences, and carbon-nitrogen metabolism of castor roots with the degree of CR (no cotyledon removed, NR; one cotyledon removed, OR; both cotyledons removed, TR) were measured under both salt and non-salt treatments. The results showed that CR inhibited biomass accumulation and damaged root architecture, and the scanning electron microscopy (SEM) analysis revealed that TR induced loss of root hairs and severe epidermal damage. Under saline conditions, CR had a more significant effect, leading to elevated Na+ concentrations and reduced K+ content in castor roots. In addition, TR treatment decreased MDA content and antioxidant enzyme activity under 150 mM NaCl, compared with NR seedlings. Moreover, CR adversely affected root carbon and nitrogen metabolism. Principal component analysis (PCA) further highlighted distinct physiological profiles, with TR150 samples clustering separately due to severe ionic and oxidative imbalances. Together, these findings provide new insight into the physiological functions of cotyledons and the above and below ground interactions of castor plants under salt conditions.","PeriodicalId":220,"journal":{"name":"Plant Biology","volume":" ","pages":"1614-1627"},"PeriodicalIF":3.4,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13358673/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148147575","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Kinetochore size correlates with chromosome size in Star of Bethlehem (Ornithogalum kochii Parl., Asparagaceae). 伯利恒之星（Ornithogalum kochii Parl）着丝粒大小与染色体大小的相关性。Asparagaceae)。

IF 3.4 3区生物学

Plant Biology Pub Date : 2026-08-01 Epub Date: 2026-04-14 DOI: 10.1111/plb.70215

K Panda, M Hroneš, F Zedek

{"title":"Kinetochore size correlates with chromosome size in Star of Bethlehem (Ornithogalum kochii Parl., Asparagaceae).","authors":"K Panda, M Hroneš, F Zedek","doi":"10.1111/plb.70215","DOIUrl":"10.1111/plb.70215","url":null,"abstract":"Chromosome segregation during cell division relies on the kinetochore, a multiprotein complex that mediates attachment of chromosomes to spindle microtubules. Biophysical considerations predict that kinetochore size should scale with chromosome size to meet increasing mechanical demands during segregation, yet empirical evidence for such scaling within karyotypes remains limited, particularly in species with modest chromosome size variation. Here, we investigated the relationship between chromosome size and kinetochore size in Star of Bethlehem (Ornithogalum kochii, Asparagaceae), a species from a genus with moderate intra-karyotype chromosome size variation (2.4-4.5-fold). Using immunolabelling of the conserved outer kinetochore protein KNL1 and linear mixed-effects modelling, we analysed 172 chromosomes across multiple metaphases, slides and individuals. We detected a strong positive scaling relationship between chromosome size and kinetochore size, demonstrating that cytogenetic approaches can resolve chromosome-kinetochore scaling even across relatively narrow size gradients. Our results demonstrate that kinetochore size scales with chromosome size even in species with modest intra-karyotype chromosome size variation, supporting the generality of chromosome-kinetochore scaling. Together with evidence from taxa exhibiting more extreme karyotype heterogeneity, this pattern suggests that centromere and kinetochore architecture is shaped by both functional constraints on chromosome segregation and long-term evolutionary processes such as centromere drive. Viewed in a broader context, chromosome-kinetochore scaling may also be relevant for processes beyond segregation, as evolutionary changes in centromere and kinetochore architecture could indirectly influence recombination rates through their effects on chromosome size.","PeriodicalId":220,"journal":{"name":"Plant Biology","volume":" ","pages":"1737-1742"},"PeriodicalIF":3.4,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13358698/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147669255","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Resisting Xylella fastidiosa: xylem anatomical changes in the susceptible olive cultivar Cellina di Nardò after long-term infection. 抗苛养木木菌：长期感染后易感橄榄Cellina di Nardò木质部解剖结构的变化。

IF 3.4 3区生物学

Plant Biology Pub Date : 2026-08-01 Epub Date: 2026-03-25 DOI: 10.1111/plb.70210

E Sabella, D Greco, E Nutricati, A Frontini, L De Bellis, M Vergine, A Luvisi

{"title":"Resisting Xylella fastidiosa: xylem anatomical changes in the susceptible olive cultivar Cellina di Nardò after long-term infection.","authors":"E Sabella, D Greco, E Nutricati, A Frontini, L De Bellis, M Vergine, A Luvisi","doi":"10.1111/plb.70210","DOIUrl":"10.1111/plb.70210","url":null,"abstract":"The Xylella fastidiosa subsp. pauca (Xfp) disease has destroyed the olive cultivations of Salento, a peninsula in the extreme south-east of Italy, and is dangerously moving northwards. Cellina di Nardò is among the cultivars most susceptible to the pathogen. However, in recent years, spontaneous canopy restoration was observed in some naturally infected plants. In this work, we investigated xylem morphological changes, resembling a response to drought stress, in plants of the susceptible cultivar Cellina di Nardò more than 10 years after the appearance of Xfp in Apulia. Results showed a significant reduction in xylem vessel diameter and frequency in 1-year-old branches, two anatomical traits already associated to Xfp resistance in several species, as well as a change in vessel placement and in the number of stand-alone (or solitary) xylem vessels. In fact, confocal microscope studies demonstrated a rise in stand-alone vessels while decreasing the number of clustered vessels. Reduced contact points in the xylem network can slow down the pathogen movement from one xylem vessel to another in host plants. The same set of observations reports the absence of bacterial vessel occlusions in new branches of Cellina di Nardò plants with an asymptomatic canopy. In summary, these findings provide novel insights into the olive trees' adaptive response to Xfp.","PeriodicalId":220,"journal":{"name":"Plant Biology","volume":" ","pages":"1628-1640"},"PeriodicalIF":3.4,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13358715/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147508246","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Locally adapted Arabidopsis thaliana accessions show transcriptomic plasticity in a multi-timescale analysis of whole-genome gene expression in a natural environment. 局部适应拟南芥材料在自然环境中全基因组基因表达的多时间尺度分析中显示出转录组可塑性。

IF 3.4 3区生物学

Plant Biology Pub Date : 2026-08-01 Epub Date: 2026-03-20 DOI: 10.1111/plb.70204

A Martínez-Pérez, R de la Mata, F J Romero-Campero, R Gómez, M Calonje, J M Romero, M T Ruiz, F Valverde, F X Picó

{"title":"Locally adapted Arabidopsis thaliana accessions show transcriptomic plasticity in a multi-timescale analysis of whole-genome gene expression in a natural environment.","authors":"A Martínez-Pérez, R de la Mata, F J Romero-Campero, R Gómez, M Calonje, J M Romero, M T Ruiz, F Valverde, F X Picó","doi":"10.1111/plb.70204","DOIUrl":"10.1111/plb.70204","url":null,"abstract":"Discerning the genes, regulatory networks and environmental cues involved in plant development represents a major goal in the plant sciences. However, genes and regulatory networks have not evolved in controlled environmental conditions but in natural environments. Hence, conducting experiments in natural settings is of paramount importance to dissect the underlying mechanisms of plant development realistically. We undertook common garden experiments in a natural environment in two contrasting years to quantify whole-genome gene expression patterns over diurnal, seasonal and annual timescales across the life-cycle phenology of Arabidopsis thaliana. Natural accessions were locally adapted to their environments by adjusting key life-history traits across an altitudinal gradient in southern Spain. We found that accession, seasonal (across developmental stages) and diurnal (morning and afternoon) comparisons chiefly structured whole-genome gene expression. We detected most of the differentially expressed genes from various biological functions and flowering-related regulatory pathways as shared among all natural accessions. Nevertheless, accessions more similar in early flowering time also exhibited more similar gene expression patterns. We also detected several flowering time genes from all known regulatory pathways across timescales, particularly from the photoperiod and circadian clock pathways. Overall, our results stressed the remarkable plasticity in both life-cycle phenology and whole-genome gene expression patterns in natural A. thaliana accessions, showed that local adaptation in fitness-related life-history traits can also be detected at the whole-genome gene expression level and highlighted the value of natural accessions with respect to laboratory strains for in natura gene expression experiments.","PeriodicalId":220,"journal":{"name":"Plant Biology","volume":" ","pages":"1641-1656"},"PeriodicalIF":3.4,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13358670/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147484047","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

RGPA-GCN: Graph convolutional networks for rice gene-phenotype association prediction. RGPA-GCN：用于水稻基因表型关联预测的图卷积网络。

IF 3.4 3区生物学

Plant Biology Pub Date : 2026-08-01 Epub Date: 2026-03-22 DOI: 10.1111/plb.70212

J Luo, X Wang, X Li, Q Zhou, Y Xiang, Z Yue, Y Gao

{"title":"RGPA-GCN: Graph convolutional networks for rice gene-phenotype association prediction.","authors":"J Luo, X Wang, X Li, Q Zhou, Y Xiang, Z Yue, Y Gao","doi":"10.1111/plb.70212","DOIUrl":"10.1111/plb.70212","url":null,"abstract":"Rice plays a pivotal role as a vital food source for human consumption. Identifying gene-phenotype associations (GPAs) can significantly enhance the tolerance of rice to environmental stress and its overall yield. Nevertheless, the experimental process of discovering GPAs is not only consume a lot of resources but also time-consuming. The computational screening for GPAs has emerged as an essential tool to complement and expedite biological experiments. In this study, we tackle the prediction of GPAs by framing it as a node classification task, and introduce RGPA-GCN, an innovative computational approach leveraging graph convolutional networks. RGPA-GCN constructs a topology graph through the application of the k-nearest neighbor method for effective information aggregation. The nodes within this graph encapsulate both gene functional similarity and phenotype semantic similarity, enhancing the accuracy of our predictions. Notably, the RGPA-GCN approach demonstrates its ability to predict both unknown GPAs and previously unseen genes or phenotypes. Leveraging 5-fold cross-validation, RGPA-GCN exhibits commendable performance, outperforming six classical machine learning methods, and three state-of-the-art models. Additionally, the ablation studies on the sampler and the case studies involving five different phenotypes yields promising results, underscoring the effectiveness of this approach.","PeriodicalId":220,"journal":{"name":"Plant Biology","volume":" ","pages":"1698-1708"},"PeriodicalIF":3.4,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13358646/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147497125","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dust reduces plant female fitness by absorbing secretions and occupying surfaces of the stigma. 灰尘通过吸收分泌物和占据柱头表面来降低植物雌性的适应性。

IF 3.4 3区生物学

Plant Biology Pub Date : 2026-08-01 Epub Date: 2026-06-09 DOI: 10.1111/plb.70220

H Wang, M Q Zhang, J X Yang, S N Zheng, W Guo

{"title":"Dust reduces plant female fitness by absorbing secretions and occupying surfaces of the stigma.","authors":"H Wang, M Q Zhang, J X Yang, S N Zheng, W Guo","doi":"10.1111/plb.70220","DOIUrl":"10.1111/plb.70220","url":null,"abstract":"As a major component of air pollution in urban environments, dust particles are similar in size to pollen grains. When deposited on the stigma, dust may occupy the space for pollen deposition and reduce the adhesion of pollen, potentially leading to a decrease in plant female fitness. Unfortunately, to date, the relevant evidence remains scarce. A dust simulation experiment was conducted on 29 plant species at the Yan'an Botanical Garden. The effects of dust deposition on the stigmatic surfaces were examined using microscopy, and female fitness was compared between experimental (dust) and control (non-dust) groups. We demonstrated that dust significantly occupied stigma surfaces and absorbed stigma secretions. The dust simulation treatment significantly decreased the fruit and seed set but did not influence the fruit length or weight. Moreover, plants with wet or more exposed stigmas showed greater susceptibility to dust, evidenced by relatively lower fruit and seed set in both the non-dust and dust treatments. Dust significantly reduces the reproduction of plants by altering the microenvironment of the flower stigma, including absorbed stigma secretions and occupied stigma surfaces, and its principal effect is observed during the critical pre-fertilization phase. Although our study significantly advances the understanding of the harmful effects of pollutants on plant reproduction, much remains to be learned and the underlying mechanisms need to be investigated in the future.","PeriodicalId":220,"journal":{"name":"Plant Biology","volume":" ","pages":"1551-1559"},"PeriodicalIF":3.4,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13358665/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148209377","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Seed dormancy and germination of three Corydalis species, disjunct relict species in East Asia. 东亚三种堇属植物的种子休眠和萌发。

IF 3.4 3区生物学

Plant Biology Pub Date : 2026-08-01 Epub Date: 2026-06-13 DOI: 10.1111/plb.70239

C W Kim, J L Walck, S N Hidayati, C H Ko, Y H Rhie, S Y Lee

{"title":"Seed dormancy and germination of three Corydalis species, disjunct relict species in East Asia.","authors":"C W Kim, J L Walck, S N Hidayati, C H Ko, Y H Rhie, S Y Lee","doi":"10.1111/plb.70239","DOIUrl":"10.1111/plb.70239","url":null,"abstract":"Disjunct congeneric species are common in the temperate flora of Europe, East Asia and eastern North America. However, it is unclear whether the kind of seed dormancy is maintained after divergence. This study aimed to determine the type of seed dormancy of three Corydalis species native to Korea and examine whether the dormancy trait has been conserved after long-term separation. We examined embryo growth and germination characteristics of C. remota, C. incisa and C. speciosa through phenology experiments, controlled temperature experiments, stratification treatments and GA3 application. All three species had underdeveloped embryos at dispersal and exhibited morphophysiological dormancy (MPD). C. remota and C. incisa required exposure to warm followed by cold temperatures for embryo growth and germination, and gibberellic acid (GA3) treatment failed to promote germination, indicating that both species have deep simple regular MPD. By contrast, C. speciosa embryos grew and germinated under cold conditions, and while germination was further enhanced by prior warm exposure, GA3 did not overcome dormancy, suggesting that C. speciosa has non-deep complex regular MPD. In all three species, embryo growth occurred in late autumn to winter with germination and seedling emergence in late winter to early spring. Whereas all three species had the same class of dormancy (MPD), differences in temperature responses were found among them. This pattern, consistent with findings from congeneric members on other continents, indicates that MPD is conserved within the genus, whereas specific dormancy levels have diversified in response to regional environmental conditions.","PeriodicalId":220,"journal":{"name":"Plant Biology","volume":" ","pages":"1573-1586"},"PeriodicalIF":3.4,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13358664/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148248522","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Anatomical adaptation mechanism of parthenocarpy tomato leaves of iaa9-3 and iaa9-5 to heat stress conditions. 孤雌番茄iaa9-3和iaa9-5叶片对热胁迫的解剖适应机制

IF 3.4 3区生物学

Plant Biology Pub Date : 2026-08-01 Epub Date: 2026-04-05 DOI: 10.1111/plb.70205

I Cartika, A Nuraini, R Kirana, R Budiarto, M H I S Jaya, E Suminar, J S Hamdani, H Ezura, S Mubarok

{"title":"Anatomical adaptation mechanism of parthenocarpy tomato leaves of iaa9-3 and iaa9-5 to heat stress conditions.","authors":"I Cartika, A Nuraini, R Kirana, R Budiarto, M H I S Jaya, E Suminar, J S Hamdani, H Ezura, S Mubarok","doi":"10.1111/plb.70205","DOIUrl":"10.1111/plb.70205","url":null,"abstract":"Heat stress significantly constrains tomato (Solanum lycopersicum) productivity, necessitating the development of heat-tolerant varieties to sustain production amid climate change. This study investigated the leaf anatomical adaptations of parthenocarpic tomato mutants iaa9-3 and iaa9-5 in response to heat stress to understand their tolerance mechanisms. The experiment was conducted in a greenhouse using a split-plot design with four replications under two environmental conditions: normal and heat stress. Leaf anatomical characteristics, including stomatal, trichome, and mesophyll attributes, were observed using a digital microscope and compared between the mutants and the wild-type (WT-MT). Both mutants exhibited significant anatomical changes compared to WT-MT. Under heat stress, iaa9-3 and iaa9-5 showed increased stomatal length but decreased width, guard cell thickness, and stomatal density. Additionally, both mutants displayed increased trichome length and density, reduced leaf cell density, and consistently higher thickness of the leaf, epidermis, palisade, and spongy layers than WT-MT across both environments. These findings strengthen the understanding of the IAA9 gene's role in regulating plant anatomy and physiology under thermal stress. The superior anatomical traits of these mutants provide a scientific basis for breeding new tomato varieties that are more resilient to climate change-induced heat stress.","PeriodicalId":220,"journal":{"name":"Plant Biology","volume":" ","pages":"1657-1668"},"PeriodicalIF":3.4,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13358634/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147621252","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Transgenerational somatic mutations and epigenetic imprints on selected DNA repair gene promoters in Arabidopsis thaliana due to pesticides. 杀虫剂引起的拟南芥DNA修复基因启动子的跨代体细胞突变和表观遗传印记。

IF 3.4 3区生物学

Plant Biology Pub Date : 2026-08-01 Epub Date: 2026-04-16 DOI: 10.1111/plb.70216

S Janardhanan, R Ramachandran, C Dominic, B Vinod, E P Amritha, A K Singh, J M Shah

{"title":"Transgenerational somatic mutations and epigenetic imprints on selected DNA repair gene promoters in Arabidopsis thaliana due to pesticides.","authors":"S Janardhanan, R Ramachandran, C Dominic, B Vinod, E P Amritha, A K Singh, J M Shah","doi":"10.1111/plb.70216","DOIUrl":"10.1111/plb.70216","url":null,"abstract":"Pesticides are known to induce genome instability. Reports on eukaryotes, including humans, mostly covers chromosomal aberrations and DNA strand breaks. Studies on scoring of the rates of loci-specific somatic mutations such as point mutations (PM), somatic homologous recombination (SHR), frameshift mutation (FSM), and transpositions due to pesticides are mostly confined to prokaryotes, using Ames test. Analogous eukaryotic model systems though are available for Drosophila, mouse and certain cell lines, reports using these are meagre, possibly due to the lethality of commercially-used pesticide doses and/or difficulty in assessing large population. DNA replication/repair being conserved among higher eukaryotes, the GUS reporter-based Arabidopsis thaliana system was used to score loci-specific mutations such as PM, SHR, FSM and transpositions. DNA repair gene expression and DNA methylation were studied using real-time PCR and methylation sensitive restriction enzyme digestion PCR, respectively. Four commercially used pesticides not only increased the rates of PM, SHR and FSM, and caused epimutations on selected DNA repair gene promoters, but also induced heritable transgenerational memory. While SHR rates were significantly high in the untreated progeny, FSM rates were high even in the grand progeny. Expression of 15 DNA repair genes increased under at least one of the pesticidal treatments. Eight of 21 DNA repair gene promoters showed altered methylation. MRE11A promoter showed demethylation in the untreated progeny due to all four pesticides. Malathion-induced demethylation was retained in the grand progeny also. Thus this work gauges the severity of various pesticides on inducing heritable loci-specific mutations/epimutations in a non-target system.","PeriodicalId":220,"journal":{"name":"Plant Biology","volume":" ","pages":"1709-1724"},"PeriodicalIF":3.4,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13358713/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147697047","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

On the relationship between Photosystem II thermotolerance and irreversible heat damage in leaves of Rhizophora mangle. 根霉叶片光系统II耐热性与不可逆热损伤的关系研究。

IF 3.4 3区生物学

Plant Biology Pub Date : 2026-08-01 Epub Date: 2026-05-05 DOI: 10.1111/plb.70223

K Winter, M Garcia, C R Krüger Nuñez, J Aranda, A Virgo

{"title":"On the relationship between Photosystem II thermotolerance and irreversible heat damage in leaves of Rhizophora mangle.","authors":"K Winter, M Garcia, C R Krüger Nuñez, J Aranda, A Virgo","doi":"10.1111/plb.70223","DOIUrl":"10.1111/plb.70223","url":null,"abstract":"Global temperatures are on the rise and may, together with more frequent and more intense heat waves, adversely affect plant performance and survival. Measurements of Photosystem II (PSII) chlorophyll a fluorescence are a widely used tool to assess the high-temperature limits of PSII, but information on how decreases in PSII competence relate to permanent leaf tissue damage and plant survival is limited. Temperature response curves of dark-level F0 fluorescence were established for the tropical mangrove Rhizophora mangle. Three fluorescence parameters were determined as follows: (i) the temperature at which F0 began to sharply rise (Tcrit); Tcrit is the most studied and often the only studied parameter in F0 heat-stress tests; (ii) the temperature at which maximal F0 fluorescence occurred (Tmax); and (iii) the temperature at which F0 was 50% of Tmax = T50. Tcrit was 49.6 °C, T50 51.3 °C and Tmax 54.5 °C. Leaf heating experiments that included 2 weeks of post-culture of leaves showed that severe tissue damage and sustained reductions in Fv/Fm, a measure of maximum quantum yield of PSII chemistry in the dark-adapted state, were associated with temperatures close to Tmax, but not Tcrit and T50. The results improve our ability to interpret F0-temperature response curves in the context of heat-induced leaf mortality, draw attention to the significance of Tmax in assessing permanent heat damage in leaves of Rhizophora mangle and highlight the fact that in F0-temperature response experiments, the widely used heat tolerance parameter Tcrit may grossly underestimate the capacity of leaves to prevent irreversible heat damage.","PeriodicalId":220,"journal":{"name":"Plant Biology","volume":" ","pages":"1596-1601"},"PeriodicalIF":3.4,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13358702/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147831374","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0