水分胁迫下梨树叶片中脱落酸与甜菜碱水平的变化  

Changes of the Levels of Abscisic Acid and Betaine in the Pear Leaves under Water Stress

作　　者：宋志辉[1] 任永玲[2] 闫根柱[3] 顾蓉[2] 高秀萍[1,4] 

机构地区：[1]山西省农业科学院旱地农业研究中心,山西太原030031 [2]山西省农业科学院,山西太原030031 [3]山西省农业科学院农产品贮藏保鲜研究所,山西太原030031 [4]农业部黄土高原作物基因资源与种质创制重点实验室,山西太原030031

出　　处：《山西农业科学》2015年第7期807-809,共3页Journal of Shanxi Agricultural Sciences

基　　金：山西省自然科学基金项目(2010011039-3)

摘　　要：脱落酸(ABA)是公认的植物感应干旱等环境胁迫的信号分子,甜菜碱是植物在干旱等环境胁迫下体内积累的渗透保护物质。但ABA是否参与了干旱诱导植物叶片中甜菜碱生物合成的信号转导过程,目前还存在争议。以梨树为试材,应用活体试验和离体试验一致证明,在梨树(Pyrus bretschneideri Redh.cv.Suli)遭受水分胁迫期间,叶片中ABA浓度显著增加,与此同时,甜菜碱水平也显著增加,表明水分胁迫下梨树叶片中甜菜碱水平是随ABA内源水平的升高而升高,这为ABA介导干旱胁迫原初物理信号、启动细胞内甜菜碱的生物合成与积累提供了又一明确的证据。Abscisic acid（ABA）is a putative signal molecule that plants sense environmental stresses such as drought. Betaine is an osmoprotectant accumulated in plants in response to drought and other environmental stresses. However, it is yet at present in contradictory views whether or not ABA involves in the signaling pathway by which drought induces the betaine biosynthesis in plant leaves. In the study, the results obtained both with potted pear（Pyrus bretschneideri Redh.）plants and with the detached leaves showed that the betaine content simultaneously significantly increased while the ABA concentration significantly increased in the leaves during water stress period, which suggested that the betaine level increased with the increasing of ABA concentration in the pear leaves under water stress.

关 键 词：梨树 水分胁迫 ABA 甜菜碱 

分 类 号：S661.2[农业科学—果树学]