影响拟南芥萌发和环境胁迫期间糖酵解及发酵基因诱导的突变
Mutations affecting induction of glycolytic and fermentative genes during germination and environmental stresses in Arabidopsis.
作者信息
Conley T R, Peng H P, Shih M C
机构信息
Department of Biological Sciences, 204 Chemistry Building, University of Iowa, Iowa City, Iowa 52242, USA.
出版信息
Plant Physiol. 1999 Feb;119(2):599-608. doi: 10.1104/pp.119.2.599.
Abstract
Expression of the alcohol dehydrogenase gene (ADH) of Arabidopsis is known to be induced by environmental stresses and regulated developmentally. We used a negative-selection approach to isolate mutants that were defective in regulating the expression of the ADH gene during seed germination; we then characterized three recessive mutants, aar1-1, aar1-2, and aar2-1, which belong to two complementation groups. In addition to their defects during seed germination, mutations in the AAR1 and AAR2 genes also affected anoxic and hypoxic induction of ADH and other glycolytic genes in mature plants. The aar1 and aar2 mutants were also defective in responding to cold and osmotic stress. The two allelic mutants aar1-1and aar1-2 exhibited different phenotypes under cold and osmotic stresses. Based on our results we propose that these mutants are defective in a late step of the signaling pathways that lead to increased expression of the ADH gene and glycolytic genes.
摘要
已知拟南芥乙醇脱氢酶基因（ADH）的表达受环境胁迫诱导并在发育过程中受到调控。我们采用负选择方法来分离在种子萌发过程中调控ADH基因表达存在缺陷的突变体；然后我们鉴定了三个隐性突变体aar1-1、aar1-2和aar2-1，它们属于两个互补群。除了在种子萌发过程中的缺陷外，AAR1和AAR2基因的突变还影响了成熟植株中ADH和其他糖酵解基因的缺氧和低氧诱导。aar1和aar2突变体在对冷胁迫和渗透胁迫的响应中也存在缺陷。两个等位突变体aar1-1和aar1-2在冷胁迫和渗透胁迫下表现出不同的表型。基于我们的结果，我们提出这些突变体在导致ADH基因和糖酵解基因表达增加的信号通路的后期步骤中存在缺陷。
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