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Trehalose phosphate synthase 5-dependent trehalose metabolism modulates basal defense responses in Arabidopsis thaliana

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Journal of Integrative plant Biology 2019年第4期61卷 509-527页

作者： Xuelan Wang Yan Du Diqiu Yu key laboratory of tropical plant resources and sustainable use Xishuangbanna Tropical Botanical Garden Chinese Academy of Sciences University of Chinese Academy of Sciences

Despite the recent discovery that trehalose synthesis is important for plant development and abiotic stress tolerance, the effects of trehalose on biotic stress responses remain relatively unknown. In this study, we demonstrate that TREHALOSE PHOSPHATE SYNTHASE 5(TPS5)-dependent trehalose metabolism regulates Arabidopsis thaliana defenses against pathogens(necrotrophic Botrytis cinerea and biotrophic Pseudomonas syringae).Pathogen infection increased trehalose levels and upregulated TPS5 expression. Application of exogenous trehalose significantly improved plant defenses against B. cinerea, but increased the susceptibility of plants to P. syringae. We demonstrate that elevated trehalose biosynthesis, in transgenic plants over-expressing TPS5, also increased the susceptibility to P. syringae, but decreased the disease elcit r symptoms caused by B. cinerea. The knockout of TPS5 prevented the accumulation of trehalose and enhanced defense responses against P. syringae. Additionally, we observed that a TPS5-interacting protein(multiprotein bridging factor 1c) was required for induced expression of TPS5 during pathogen infections. Furthermore, we show that trehalose promotes P. syringae growth and disease development, via a mechanism involving suppression of the plant defense gene, Pathogenesis-Related Protein 1. These findings provide insight into the function of TPS5-dependent trehalose metabolism in plant basal defense responses.

关键词： Trehalose phosphate synthase Arabidopsis thaliana^FA

Insight into the mode of action of 2,4-dichlorophenoxyacetic acid(2,4-D) as an herbicide

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Journal of Integrative plant Biology 2014年第2期56卷 106-113页

作者： Yaling Song key laboratory of tropical plant Resource and sustainable use Xishuangbanna Tropical Botanical Garden the Chinese Academy of Sciences

2,4-Dichlorophenoxyacetic acid （2,4-D） was the first synthetic herbicide to be commercially developed and has commonly been used as a broadleaf herbicide for over 60 years. It is a selective herbicide that kills dicots without affecting monocots and mimics natural auxin at the molecular level. Physiological responses of dicots sensitive to auxinic herbicides include abnormal growth, senescence,and plant death. The identification of auxin receptors, auxin transport carriers, transcription factors response to auxin, and cross-talk among phytohormones have shed light on the molecular action mode of 2,4-D as a herbicide. Here, the molecular action mode of 2,4-D is highlighted according to the latest findings, emphasizing the physiological process, perception, and signal transduction under herbicide treatment.

关键词： 2,4-D (2,4-dichlorophenoxyacetic acid) abscisic acid auxin ethylene herbicide metabolism

bHLH104 confers tolerance to cadmium stress in Arabidopsis thaliana

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Journal of Integrative plant Biology 2018年第8期60卷 691-702页

作者： Xiani Yao Yuerong Cai Diqiu Yu Gang Liang key laboratory of tropical plant resources and sustainable use Xishuangbanna Tropical Botanical Garden Chinese Academy of Sciences Kunming 650223 China University of Chinese Academy of Sciences Beijing 100049 China

Cd is a non-essential heavy metal that is toxic to both plants and animals. Here, we reveal that the transcription factor bHLH104 positively regulates Cd tolerance in Arabidopsis thaliana. We show that Fe deficiency-responsive genes were induced by Cd treat- ment, and that their upregulation was suppressed in bhlh104 loss-of-function mutants, but enhanced upon overexpression of bHLH104. Correspondingly, the bhlh104 mutants displayed sensitivity to Cd stress, whereas plants overexpressing bHLH104 exhibited enhanced Cd tolerance. Further analysis suggested that bHLH104 positivelyregulates four heavy metal detoxification-associated genes, IREG2, A4TP3, HA4A3 and NAS4, which play roles in Cd sequestration and tolerance. The bHLH104 overexpres- sion plants accumulated high levels of Cd in the root but low levels of Cd in the shoot, which might contribute to the Cd tolerance in those lines. The present study thus points to bHLH104 as a potentially useful tool for genetic engineering of plants with enhanced Cd tolerance.

关键词： bHLH104 confers tolerance to cadmium stress in Arabidopsis thaliana Cd Fe

The bHLH Transcription Factors MYC2, MYC3, and MYC4 Are Required for Jasmonate-Mediated Inhibition of Flowering in Arabidopsis

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Molecular plant 2017年第11期10卷 1461-1464页

作者： Houping Wang Yang Li Jinjing Pan Dengji Lou Yanru Hu Diqiu Yu key laboratory of tropical plant resources and sustainable use Xishuangbanna Tropical Botanical Garden Chinese Academy of Sciences Kunming Yunnan 660223 China University of Chinese Academy of Sciences Beijing 100049 China

Dear Editor,In plants, the floral transition is flexibly controlled by various environmental conditions and endogenous developmental cues. In Arabidopsis, six major flowering pathways respond to changes in these factors （Fornara et al., 2010）. The photoperiod, vernalization, and ambient pathways monitor exogenous signals from the environment such as day length, minimum winter temperature, and ambient temperature （Fornara et al., 2010）. By contrast, the autonomous, gibberellin, and age pathways respond to endogenous cues linked to developmental status （Fornara et al., 2010）. Accumulating evidence indicates that the six flowering pathways converge in a network to regulate floral integrator genes FLOWERING LOCUS T （FT）, TWIN SISTER OF FT （TSF）, and SUPPRESSOR OF OVEREXPRESSION OF CONSTANS1 （Fornara et al., 2010）.

关键词： The bHLH Transcription Factors MYC2 MYC3 MYC4 Are Required for Jasmonate-Mediated Inhibition of Flowering in Arabidopsis

bHLH121 Functions as a Direct Link that Facilitates the Activation of FIT by bHLH IVc Transcription Factors for Maintaining Fe Homeostasis in Arabidopsis

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Molecular plant 2020年第4期13卷 634-649页

作者： Rihua Lei Yang Li Yuerong Cai Chenyang Li Mengna Pu Chengkai Lu Yujie Yang Gang Liang cas key laboratory of tropical plant resources and sustainable use Xishuangbanna Tropical Botanical GardenChinese Academy of SciencesKunmingYunnan 650223China Center of Economic Botany Core Botanical GardensChinese Academy of SciencesMenglunMenglaYunnan 666303China University of Chinese Academy of Sciences Beijing 100049China

Iron(Fe)deficiency is prevalent in plants grown in neutral or alkaline *** have evolved sophisticated mechanisms that regulate Fe homeostasis,ensuring *** Arabidopsis,FER-LIKE IRON DEFICIENCY-INDUCED TRANSCRIPTION FACTOR(FIT)is a crucial regulator of Fe-deficiency *** is activated indirectly by basic helix-loop-helix(bHLH)IVc transcription factors(TFs)under Fed eficiency;how ever,it remains unclear which protein(s)act as the linker to mediate the activation of FIT by bHLH IVc *** this study,we characterize the functions of bHLH121 and demonstrate that it directly associates with the FIT *** found that loss-of-function mutations of bHLH121 cause severe Fedeficiency symptoms,reduced Feaccum ulation,and disrupted expression of genes associated with *** analysis showed that FIT is epistatic to bHLH121 and FIT overexpression partially rescues the bhlh121 *** investigations revealed that bHLH IVc TFs interact with and promote nuclear accumulation of *** demonstrated that bHLH121 has DNA-binding activity and can bind the prom oters of the FIT and bHLHlb genes,but we did not find that it has either direct transcriptional activation or repression activity tow ard these *** hile,we found that bHLH121 functions downstream of and is a direct target of bHLH IVc TFs,and its expression is induced by Fe deficiency in a bHLH IV c-dependent *** together,these results establish that bHLH121 functions together with bHLH IVc TFs to positively regulate the expression of FIT and thus plays a pivotal role in maintaining Fe homeostasis in Arabidopsis.

关键词： bHLH121 bHLH IVc bHLH lb FIT iron uptake Arabidopsis

WRKY transcription factors WRKY12 and WRKY13 interact with SPL10 to modulate age-mediated flowering

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Journal of Integrative plant Biology 2020年第11期62卷 1659-1673页

作者： Zhenbing Ma Wei Li Houping Wang Diqiu Yu School of Life Sciences University of Science and Technology of ChinaHefeiAnhui 230027China cas key laboratory of tropical plant resources and sustainable use Xishuangbanna Tropical Botanical Gardenthe Chinese Academy of SciencesKunming 650223China State key laboratory for Conservation and Utilization of Bio-resources in Yunnan Yunnan UniversityKunming 650091China School of Horticulture Anhui Agricultural UniversityHefei 230036China

WRKY12 and WRKY13 are two WRKY transcription factors that play important roles in the control of flowering time under short-day(SD)*** temporally regulated expression of WRKY12 and WRKY13 indicates that they may be involved in the age-mediated flowering ***,their roles in this pathway are poorly ***,we show that the transcription of WRKY12 and WRKY13 is directly regulated by SQUAMOSA PROMOTER BINDING-LIKE 10(SPLio),a transcription factor downstream of the age *** and activation analyses revealed that SPL10 functions as a positive regulator of WRKY12 and a negative regulator of *** mechanistic investigation revealed that WRKY12 and WRKY13 physically interact with SPL10 and that both of them bind to the promoter of ***,the WRKY12-SPL10 and WRKY13-SPL10 interactions facilitate and inhibit SPL10 transcriptional function,respectively,to regulate miRiy2b ***,our results show that WRKY12 and WRKY13 participate in the control of age-mediated flowering under SD conditions though physically interacting with SPLs and co-regulating the target gene miRi72b.

关键词： expression. WRKY SPL

ERF1 delays flowering through direct inhibition of FLOWERING LOCUS T expression in Arabidopsis

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Journal of Integrative plant Biology 2021年第10期63卷 1712-1723页

作者： Yanli Chen Liping Zhang Haiyan Zhang Ligang Chen Diqiu Yu cas key laboratory of tropical plant resources and sustainable use Xishuangbanna Tropical Botanical GardenChinese Academy of SciencesMengla 666303China University of Chinese Academy of Sciences Beijing 100049China key laboratory for plant Diversity and Biogeography of East Asia Kunming Institute of BotanyChinese Academy of SciencesKunming 650201China Center of Economic Botany Core Botanical GardensChinese Academy of SciencesMenglunMengla 666303China State key laboratory for Conservation and Utilization of Bio-resources in Yunnan Yunnan UniversityKunming 650091China

ETHYLENE RESPONSE FACTOR1(ERF1)is a key component in ethylene signaling,playing crucial roles in both biotic and abiotic stress ***,we demonstrate that ERF1 also has an important role during floral initiation in Arabidopsis *** or knockout of ERF1 accelerated floral initiation,whereas overexpression of ERF1 dramatically delayed floral *** contrasting phenotypes were correlated with opposite transcript levels of FLOWERING LOCUS T(FT).Chromatin immunoprecipitation(ChIP)assays revealed that ERF1 associates with genomic regions of the FT gene to repress its ***-10/ERF1RNAi plants showed a similar flowering phenotype to the ft-10 mutant,whereas the flowering of FTox/ERF1ox mimicked that of FTox plants,suggesting that ERF1 acts upstream of FT during floral ***,altered floral transition in ethylene-related mutants was also correlated with FT *** analysis suggested that ERF1 also participates in delay in flowering-time control mediated by the ethylene precursor 1-aminocyclopropane-1-carboxylic ***,ERF1 may act as a negative modulator of flowering-time control by repressing FT transcription in Arabidopsis.

关键词： Arabidopsis thaliana ethylene ETHYLENE RESPONSE FACTOR1 floral initiation FLOWERING LOCUS T

Oryza sativa FER-LIKE FE DEFICIENCY-INDUCED TRANSCRIPTION FACTOR(OsFIT/OsbHLH156)interacts with OsIRO2 to regulate iron homeostasis

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Journal of Integrative plant Biology 2020年第5期62卷 668-689页

作者： Gang Liang Huimin Zhang Yang Li Mengna Pu Yujie Yang Chenyang Li Chengkai Lu Peng Xu Diqiu Yu cas key laboratory of tropical plant resources and sustainable use Xishuangbanna Tropical Botanical GardenThe Innovative Academy of Seed DesignChinese Academy of SciencesKunming 650223China Center of Economic Botany Core Botanical GardensChinese Academy of SciencesMenglunMengla 666303China University of Chinese Academy of Sciences Beijing 100049China State key laboratory for Conservation and Utilization of Bio-resources in Yunnan Yunnan UniversityKunming 650091China

Iron(Fe)is indispensable for the growth and development of *** is well known that FER-LIKE FE DEFICIENCY-INDUCED TRANSCRIPTION FACTOR(FIT)is a key regulator of Fe uptake in ***,we identify the Oryza sativa FIT(also known as Osb HLH156)as the interacting partner of IRON-RELATED BHLH TRANSCRIPTION FACTOR 2(OsIRO2)that is critical for regulating Fe *** OsIRO2 protein is localized in the cytoplasm and nucleus,but OsFIT facilitates the accumulation of OsIRO2 in the ***-of-function mutations of OsFIT result in decreased Fe accumulation,severe Fe-deficiency symptoms,and disrupted expression of Feuptake *** contrast,OsFIT overexpression promotes Fe accumulation and the expression of Fe-uptake *** analyses indicate that OsFIT and OsIRO2 function in the same genetic *** analyses suggest that OsFIT and OsIRO2 form a functional transcription activation complex to initiate the expression of Fe-uptake *** findings provide a mechanism understanding of how rice maintains Fe homeostasis.

关键词： homeostasis maintain finding

ICE1 interacts with IDD14 to transcriptionally activate QQS to increase pollen germination and viability

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Journal of Integrative plant Biology 2024年第8期66卷 1801-1819页

作者： Landi Luo Yan Zheng Xieshengyang Li Qian Chen Danni Yang Zhijia Gu Ya Yang Yunqiang Yang Xiangxiang Kong Yongping Yang cas key laboratory of tropical plant resources and sustainable use Xishuangbanna Tropical Botanical GardenThe Chinese Academy of SciencesXishuangbanna 666303China Germplasm Bank of Wild Species Yunnan Key Laboratory for Crop Wild Relatives OmicsKunming Institute of BotanyThe Chinese Academy of SciencesKunming 650201China School of Agriculture Yunnan UniversityKunming 650091China key laboratory for plant Diversity and Biogeography of East Asia Kunming Institute of BotanyThe Chinese Academy of SciencesKunming 650201China

In flowering plants,sexual reproductive success depends on the production of viable pollen ***,the mechanisms by which QUA QUINE STARCH(QQS)regulates pollen development and how transcriptional activators facilitate the transcription of QQS in this process remain poorly ***,we demonstrate that INDUCER OF CBF EXPRESSION 1(ICE1),a basic helix–loop–helix(b HLH)transcription factor,acts as a key transcriptional activator and positively regulates QQS expression to increase pollen germination and viability in Arabidopsis thaliana by interacting with INDETERMINATE DOMAIN14(IDD14).In our genetic and biochemical experiments,overexpression of ICE1 greatly promoted both the activation of QQS and high pollen viability mediated by ***14 additively enhanced ICE1 function by promoting the binding of ICE1 to the QQS *** addition,mutation of ICE1 significantly repressed QQS expression;the impaired function of QQS and the abnormal anther dehiscence jointly affected pollen development of the ice1-2 *** results also showed that the enhancement of pollen activity by ICE1 depends on ***,QQS interacted with CUT1,the key enzyme for long-chain lipid *** interaction both promoted CUT1 activity and regulated pollen lipid metabolism,ultimately determining pollen hydration and *** results not only provide new insights into the key function of QQS in promoting pollen development by regulating pollen lipid metabolism,but also elucidate the mechanism that facilitates the transcription of QQS in this vital developmental process.

关键词： transcriptional metabolism jointly