干旱胁迫和脱落酸对杨树根内皮层发育的影响  

Effects of drought stress and ABA on the development of endodermis in poplar root

作　　者：于洋 刘春浩 樊守金[1] 贺新强[2] YU Yang;LIU Chun-hao;FAN Shou-jin;HE Xin-qiang(Key Lab of Plant Stress Research,College of Life Sciences,Shandong Normal University,Jinan Shandong 250014;College of Life Sciences,Peking University,Beijing 100871,China)

机构地区：[1]山东师范大学生命科学学院逆境植物重点实验室,山东济南250014 [2]北京大学生命科学学院,北京100871

出　　处：《电子显微学报》2020年第3期300-306,共7页Journal of Chinese Electron Microscopy Society

基　　金：国家自然科学基金资助项目(No.31570581).

摘　　要：植物根中的内皮层发育一般经历两个阶段,首先形成可以阻挡质外体运输途径的木质素沉积,即凯氏带形成阶段;其次生成可以阻断跨细胞运输的木栓质沉积,即凯氏带加厚阶段。内皮层凯氏带的形成与加厚导致了外界的水和溶质只能通过共质体运输途径进入中柱,保障了植物从外界向内部运输物质时的选择能力。本文通过对84K杨树施加聚乙二醇(PEG)模拟干旱胁迫以及施加脱落酸(ABA),发现PEG模拟的干旱胁迫和ABA均能够促进凯氏带加厚,ABA参与了凯氏带木栓化形成,为植物根内皮层发育调控研究提供了新的实验依据。The development of endodermis in plant roots generally goes through two stages:formation stage of Casparian strip with the lignin deposition,which can block the apoplastic pathway,and thickening stage of Casparian strip with suberin lamellae formation,which can block the coupled trans-cellular pathway.The formation and thickening of the Casparian strip in the endodermis results in that the external water and solute can only enter the stele through the symplastic pathway,which guarantees the selection ability of plants when they transport materials from the outside to the inside.Through the application of PEG and ABA on 84 K poplar(Populus alba×P.glandulosa cv′84k′),it was found that PEG simulated drought stress and ABA could promote the thickening of Casparian strip,and ABA signal participated in the formation of suberin lamellae in Casparian strip,which laid a foundation for further research on the regulation of root endodermis development.

关 键 词：干旱胁迫 凯氏带 内皮层 脱落酸 杨树 

分 类 号：S792.11[农业科学—林木遗传育种] Q336[农业科学—林学]