Effects of abscisic acid (ABA) on grain filling processes in wheat
Effects of abscisic acid (ABA) on grain filling processes in wheat
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DOI：
10.1023/a:1006223925694
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发表时间：
1999-07-01
影响因子：
4.2
通讯作者：
Baker, DA
中科院分区：
文献类型：
--
作者：
Ahmadi, A;Baker, DA
研究了原位水分胁迫对胚乳内源脱落酸(ABA)含量的影响以及ABA在小麦一些重要产量调节过程中的体外应用。水分胁迫导致在接近停止生长时胚乳的 ABA 含量显着增加。在离体穗培养基中应用ABA可降低粒重。外源施加最高浓度（0.1 mM）的 ABA 会减少蔗糖向谷物的转运，并降低完整谷物的淀粉合成能力。培养基中低 ABA 浓度 (0.001 mM) 会刺激离体谷物对体外蔗糖的吸收和转化，但会受到较高浓度的抑制。 ABA的施用对蔗糖合酶（SS）和尿苷二磷酸葡萄糖焦磷酸化酶（UDP-Gppase）活性没有影响，而腺苷二磷酸葡萄糖焦磷酸化酶（ADP-Gppase）、可溶性淀粉合酶（SSS）和颗粒结合淀粉合酶（GBSS）活性降低。这些结果提出了水分胁迫引起的内源ABA水平升高导致籽粒生长减缓的可能性。
The effect of in situ water stress on the endogenous abscisic acid (ABA) content of the endosperm and the in vitro application of ABA on some important yield regulating processes in wheat have been studied. Water stress resulted in a marked increase in the ABA content of the endosperm at the time close to cessation of growth. Application of ABA to the culture medium of detached ears reduced grain weight. Exogenously applied ABA, at the highest concentration (0.1 mM) reduced transport of sucrose into the grains and lowered the starch synthesis ability of intact grains. In vitro sucrose uptake and conversion by isolated grains was stimulated by low ABA concentrations (0.001 mM) in the medium but was inhibited by higher concentrations. ABA application had no effect on sucrose synthase (SS) and uridine diphosphate glucose pyrophosphorylase (UDP-Gppase) activities, whereas adenosine diphosphate glucose pyrophosphorylase (ADP-Gppase), soluble starch synthase (SSS), and granule-bound starch synthase (GBSS) activities were reduced. These results raise the possibility that water stress-induced elevated levels of endogenous ABA contribute to reduced grain growth.