报告题目🛷：The Karrikin Receptor KAI2 Promotes Drought Resistance in Arabidopsis thaliana
报告人：李伟强🤵🏽👩🏻🦽，日本理化学研究所研究员
主持人🚭：罗音 高级工程师
报告时间：2018年2月27日 10:00
报告地点：天美娱乐534小会议室
举办单位✌🏻🧗🏼：天美娱乐/科技处
报告人简介👵🏿🪹：1997 年毕业于南京农业大学，2009年在日本鸟取大学获得博士学位。2009年至2011年在日本理化学研究所植物科学研究中心做JSPS博士后🏋️，2011年至2015年4月先后在东京大学农学生命科学研究科和农业生物资源研究所做博士后研究员，2015年5月至今在日本理化学研究所担任研究员。主要研究领域为植物激素（细胞分裂素、独脚金内酯😾、Karrikin）信号转导元件对植物抗旱的分子🤒、生理😄、生化机理研究🖨。在Proc Natl Acad Sci ，Trends in Plant Science，Plant Journal🚴🏼♂️，Plant Cell Physiol，Plos Genet.🧑🏻🦯，Front Plant. Science等杂志发表学术论文或评述30余篇，其中一篇论文被Science杂志推荐阅读（Science2017, Vol 358, Issue 6368:1267-1268），著书5部🎩，分别获得河北省科技进步二等奖和国家专利各一项。
报告摘要💅：Drought causes substantial reductions in crop yields worldwide. Therefore, we set out to identify new chemical and genetic factors that regulate drought resistance in Arabidopsis thaliana. Karrikins (KARs) are a class of butenolide compounds found in smoke that promote seed germination, and have been reported to improve seedling vigor under stressful growth conditions. Here, we discovered that mutations in KARRIKIN INSENSITIVE2 (KAI2), encoding the proposed karrikin receptor, result in hypersensitivity to water deprivation. We performed transcriptomic, physiological and biochemical analyses of kai2 plants to understand the basis for KAI2-regulated drought resistance. We found that kai2 mutants have increased rates of water loss and drought-induced cell membrane damage, enlarged stomatal apertures, and higher cuticular permeability. In addition, kai2 plants have reduced anthocyanin biosynthesis during drought, and are hyposensitive to abscisic acid (ABA) in stomatal closure and cotyledon opening assays. We identified genes that are likely associated with the observed physiological and biochemical changes through a genome-wide transcriptome analysis of kai2 under both well-watered and dehydration conditions. These data provide evidence for crosstalk between ABA- and KAI2-dependent signaling pathways in regulating plant responses to drought. A comparison of the strigolactone-insensitive mutant d14 (DWARF14) to kai2 indicated that strigolactones also contributes to plant drought adaptation, although not by affecting cuticle development. Our findings suggest that chemical or genetic manipulation of KAI2 and D14 signaling may provide novel ways to improve drought resistance.
