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首页> 美国卫生研究院文献>Physiology and Molecular Biology of Plants >Bread wheat progenitors: Aegilops tauschii (DD genome) and Triticum dicoccoides (AABB genome) reveal differential antioxidative response under water stress
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Bread wheat progenitors: Aegilops tauschii (DD genome) and Triticum dicoccoides (AABB genome) reveal differential antioxidative response under water stress

机译：面包小麦的祖先：Aegilops tauschii（DD基因组）和Triticum dicoccoides（AABB基因组）显示了水分胁迫下的不同抗氧化反应

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Antioxidant enzymes are known to play a significant role in scavenging reactive oxygen species and maintaining cellular homeostasis. Activity of four antioxidant enzymes viz., superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX) and glutathione reductase (GR) was examined in the flag leaves of nine Aegilops tauschii and three Triticum dicoccoides accessions along with two bread wheat cultivars under irrigated and rain-fed conditions. These accessions were shortlisted from a larger set on the basis of field performance for a set of morpho-physiological traits. At anthesis, significant differences were observed in enzyme activities in two environments. A 45% elevation in average GR activity was observed under rain-fed conditions. Genotypic variation was evident within each environment as well as in terms of response to stress environment. Aegilops tauschii accession 3769 (86% increase in SOD, 41% in CAT, 72% in APX, 48% in GR activity) and acc. 14096 (37% increase in SOD, 32% CAT, 25% APX, 42% GR) showed up-regulation in the activity of all the four studied antioxidant enzymes. Aegilops tauschii accessions—9809, 14189 and 14113 also seemed to have strong induction mechanism as elevated activity of at least three enzymes was observed in them under rain-fed conditions. T. dicoccoides, on the other hand, maintained active antioxidative machinery under irrigated condition with relatively lower induction under stress. A significant positive correlation (r = 0.760) was identified between change in the activity of CAT and GR under stress. Changes in plant height, spike length and grain weight were recorded under stress and non-stress conditions on the basis of which a cumulative tolerance index was deduced and accessions were ranked for drought tolerance. Overall, Ae. tauschii accession 3769, 14096, 14113 (DD-genome) and T. dicoccoides accession 7054 (AABB-genome) may be used as donors to combine beneficial stress adaptive traits of all the three sub-genomes into a synthetic hexaploid for improving wheat for water stress conditions.
机译：已知抗氧化酶在清除活性氧和维持细胞稳态方面起着重要作用。在9个tauschii和3个Triticum dicoccoides品种和2个面包小麦的旗叶中检测了4种抗氧化酶的活性，即超氧化物歧化酶（SOD），过氧化氢酶（CAT），抗坏血酸过氧化物酶（APX）和谷胱甘肽还原酶（GR）。灌溉和雨养条件下的栽培品种。根据田间表现的一系列形态生理特征，从较大的一组入选这些入种。在花期，在两种环境中观察到酶活性的显着差异。在雨水喂养条件下，观测到的平均GR活性提高了45％。基因型变异在每个环境中以及在对胁迫环境的响应方面都是明显的。牛肝菌（Aegilops tauschii）保藏号3769（SOD增加86％，CAT增加41％，APX增加72％，GR活性增加48％）。 14096（SOD增加37％，CAT 32％，APX 25％，GR 42％）显示出所有四种研究的抗氧化酶的活性均上调。 tauschii牛肝菌（9809、14189和14113）似乎也具有很强的诱导机制，因为在雨水条件下观察到它们中至少三种酶的活性升高。另一方面，T。dicoccoides可以在灌溉条件下保持活性抗氧化机制，而在压力下诱导则相对较低。在压力下CAT和GR的活性变化之间发现显着正相关（r = 0.760）。在胁迫和非胁迫条件下记录植物高度，穗长和粒重的变化，在此基础上推导累积耐性指数，并为耐旱性对种质进行排名。总体来说，爱tauschii品种3769、14096、14113（DD基因组）和T. dicoccoides品种7054（AABB基因组）可以用作供体，将所有三个亚基因组的有益胁迫适应性状组合到合成六倍体中，以改良小麦用于水压力条件。

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