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A Pivotal Role of DELLAs in Regulating Multiple hormone Signals

Molecular Plant 2016年第1期9卷 10-20页

作者： Jean-Michel Daviere Patrick Achard Institut de Biologie Moleculaire des Plantes (IBMP) UPR2357 associe avec l'Universite de Strasbourg 12 rue General Zimmer 67084 Strasbourg Cedex France

Plant phenotypic plasticity is controlled by diverse hormone pathways, which integrate and convey infor- mation from multiple developmental and environmental signals. Moreover, in plants many processes such as growth, development, and defense are regulated in similar ways by multiple hormones. Among them, gibberellins （GAs） are phytohormones with pleiotropic actions, regulating various growth processes throughout the plant life cycle. Previous work has revealed extensive interplay between GAs and other hor- mones, but the molecular mechanism became apparent only recently. Molecular and physiological studies have demonstrated that DELLA proteins, considered as master negative regulators of GA signaling, inte- grate multiple hormone signaling pathways through physical interactions with transcription factors or reg- ulatory proteins from different families. In this review, we summarize the latest progress in GA signaling and its direct crosstalk with the main phytohormone signaling, emphasizing the multifaceted role of DELLA proteins with key components of major hormone signaling pathways.

关键词： gibberellins DELLAs hormone crosstalk plant development phenotypic plasticity

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Ethylene signaling in rice and Arabidopsis: New regulators and mechanisms

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Journal of Integrative Plant Biology 2021年第1期63卷 102-125页

作者： He Zhao Cui-Cui Yin Biao Ma Shou-Yi Chen Jin-Song Zhang State Key Lab of Plant Genomics Institute of Genetics&Developmental BiologyInnovation Academy for Seed DesignChinese Academy of SciencesBeijing 100101China Biology and Agriculture Research Center School of Chemistry and Bioloqical EngineeringUniversity of Science and Technology BeijingBeijing 100024China College of Advanced Agricultural Sciences University of Chinese Academy of SciencesBeijing 100049China

Ethylene is a gaseous hormone which plays important roles in both plant growth and development and stress responses. Based on studies in the dicot model plant species Arabidopsis, a linear ethylene signaling pathway has been established,according to which ethylene is perceived by ethylene receptors and transduced through CONSTITUTIVE TRIPLE RESPONSE 1(CTR1) and ETHYLENE-INSENSITIVE 2(EIN2) to activate transcriptional reprogramming. In addition to this canonical signaling pathway, an alternative ethylene receptor-mediated phosphor-relay pathway has also been proposed to participate in ethylene signaling. In contrast to Arabidopsis, rice, a monocot, grows in semiaquatic environments and has a distinct plant structure. Several novel regulators and/or mechanisms of the rice ethylene signaling pathway have recently been identified,indicating that the ethylene signaling pathway in rice has its own unique features. In this review,we summarize the latest progress and compare the conserved and divergent aspects of the ethylene signaling pathway between Arabidopsis and rice. The crosstalk between ethylene and other plant hormones is also reviewed. Finally, we discuss how ethylene regulates plant growth, stress responses and agronomic traits. These analyses should help expand our knowledge of the ethylene signaling mechanism and could further be applied for agricultural purposes.

关键词： Arabidopsis ethylene signaling hormone crosstalk rice

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Ambivalent response in pathogen defense: A double-edged sword?

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Plant Communications 2022年第6期3卷 190-207页

作者： Chi-Yeol Kim Hyeunjeong Song Yong-Hwan Lee Department of Agricultural Biotechnology Seoul National UniversitySeoul 08826Korea Plant Immunity Research Center Seoul National UniversitySeoul 08826Korea Research Institute of Agriculture and Life Sciences Seoul National UniversitySeoul 08826Korea Interdisciplinary Program in Agricultural Genomics Seoul National UniversitySeoul 08826Korea Center for Fungal Genetic Resources Seoul National UniversitySeoul 08826Korea

Plants possess effective immune systems that defend against most microbial *** plant immunity research has focused on the classic binary defense model involving the pivotal role of small-molecule hormones in regulating the plant defense signaling *** most of our current understanding comes from studies that relied on information derived from a limited number of pathosystems,newer studies concerning the incredibly diverse interactions between plants and microbes are providing additional insights into other novel ***,we review the roles of both classical and more recently identified components of defense signaling pathways and stress hormones in regulating the ambivalence effect during responses to diverse *** of their different lifestyles,effective defense against biotrophic pathogens normally leads to increased susceptibility to necrotrophs,and vice *** these opposing forces,the plant potentially faces a trade-off when it mounts resistance to a specific pathogen,a phenomenon referred to here as the ambivalence *** also highlight a novel mechanism by which translational control of the proteins involved in the ambivalence effect can be used to engineer durable and broad-spectrum disease resistance,regardless of the lifestyle of the invading pathogen.

关键词： ambivalence effect crop protection hormone crosstalk pathogen plant defense susceptibility(S)gene

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