Effects of Drought Stress on Pollen Sterility, Grain Yield, Abscisic Acid and Protective Enzymes in Two Winter Wheat Cultivars.
Effects of Drought Stress on Pollen Sterility, Grain Yield, Abscisic Acid and Protective Enzymes in Two Winter Wheat Cultivars.
复制标题
干旱胁迫对两个冬小麦品种花粉不育、产量、脱落酸和保护酶的影响
DOI：
10.3389/fpls.2017.01008
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发表时间：
2017
影响因子：
5.6
通讯作者：
Liu M
中科院分区：
文献类型：
--
作者：
Dong B;Zheng X;Liu H;Able JA;Yang H;Zhao H;Zhang M;Qiao Y;Wang Y;Liu M
干旱胁迫导致小麦花粉败育是导致小麦籽粒减少的一个不利因素。探讨干旱条件下小麦花粉育性的机制，有助于培育耐逆高产小麦品种。本文以2个中国小麦品种为材料，研究了小孢子期不同程度干旱胁迫下花粉育性与抗逆性之间的关系。两个品种在低水分条件下，籽粒数减少较多。总体而言，在所有胁迫条件下，耐旱品种（金麦47）的籽粒数减少量均小于干旱敏感品种（石栾02 -1）。与石栾02 -1相比，金麦47在逆境下叶片光合速率、穗部碳水化合物积累、花粉库强度、花粉发育和育性等方面表现出上级的生理表现。此外，晋麦47穗内源脱落酸含量的增加低于石栾02 -1。PEG胁迫下，耐旱品种晋麦47的超氧化物歧化酶（SOD）和过氧化物酶（POD）活性均高于干旱敏感品种石栾02 -1。这些生理性状的变化可能有助于更好的花粉发育和雄性育性，最终导致在干旱胁迫下保持籽粒数量。
Drought stress induced pollen sterility is a detrimental factor reducing grain number in wheat. Exploring the mechanisms underlying pollen fertility under drought conditions could assist breeding high-yielding wheat cultivars with stress tolerance. Here, by using two Chinese wheat cultivars subjected to different levels of polyethylene glycol (PEG)-induced drought stress, possible links between pollen fertility and stress tolerance were analyzed under different levels of drought stress at the young microspore stage. In both cultivars, higher grain number reduction was observed under condition of lower water availability. Overall, the drought tolerant cultivar (Jinmai47) exhibited less grain number reduction than the drought sensitive cultivar (Shiluan02-1) under all stress conditions. Compared with Shiluan02-1, Jinmai47 exhibited superior physiological performance in terms of leaf photosynthetic rate, ear carbohydrate accumulation, pollen sink strength, pollen development and fertility under stress. Moreover, Jinmai47 showed a lower increase in endogenous abscisic acid in ears than Shiluan02-1. Furthermore, higher levels of superoxide dismutase (SOD) and peroxidase (POD) activities were also found in the drought tolerant cultivar Jinmai47 under PEG stress, compared with the drought sensitive cultivar Shiluan02-1. Changes in these physiological traits could contribute to better pollen development and male fertility, ultimately leading to the maintenance of grain number under drought stress.