From epoxycarotenoids to ABA: the role of ABA 8'-hydroxylases in drought-stressed maize roots.
From epoxycarotenoids to ABA: the role of ABA 8'-hydroxylases in drought-stressed maize roots.
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DOI：
10.1016/j.abb.2010.07.005
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发表时间：
2010-12-01
影响因子：
3.9
通讯作者：
Wurtzel ET
中科院分区：
文献类型：
--
作者：
Vallabhaneni R;Wurtzel ET
植物的耐旱能力，一个潜在的主要限制产量和生产，是受脱落酸（阿坝）。阿坝在细胞质中由质体类胡萝卜素途径衍生的前体合成，随后通过阿坝羟化酶的作用失活。内源阿坝的积累受其合成和催化作用的双重控制。阿坝8′-羟化酶（ABA 8 Ox），也称为CYP 707 A，被认为是调节阿坝水平的关键步骤之一，控制许多生理过程。为了研究这种酶的作用，鉴定了玉米ABA 8 Ox基因家族成员。然后分析了ABA 8 Ox基因在玉米干旱胁迫响应过程中不同组织和根中的表达。发现这些基因在所有组织中表达，对每个组织具有高度特异性和一定程度的重叠。玉米ABA 8 Ox 1a和ABA 8 Ox 1b是干旱胁迫下调节阿坝催化的主要转录组分。系统发育和基因结构分析进行扩展的影响，并推断阿坝catalysts在其他谷类作物的原因。
The ability of plants to withstand drought, a potentially major constraint to yield and production, is influenced by abscisic acid (ABA). ABA is synthesized in the cytosol from plastid carotenoid pathway derived precursors, and later inactivated by the action of ABA hydroxylases. Endogenous accumulation of ABA is controlled by both its synthesis and catabolism. Enzymatic activity of ABA 8′-hydroxylase (ABA8Ox), also referred to as CYP707A, is considered one of the key steps in modulating ABA levels that control numerous physiological processes. To investigate the role of this enzyme, maize ABA8Ox gene family members were identified. ABA8Ox gene expression was then analyzed in different tissues and roots during the drought-stress response in maize. These genes were found to be expressed in all tissues, with a high degree of specificity to each tissue and some degree of overlap. Maize ABA8Ox1a and ABA8Ox1b were shown to be the major transcript components for regulating ABA catabolism in drought-stressed roots. Phylogenetic and gene-structure analyses were performed to extend the implications and infer the cause of ABA catabolism in other cereal crops.
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影响因子：
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