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首页> 外文期刊>International Journal of Biosciences >Abscisic acid and cytokinin-induced carbohydrate and antioxidant levels regulation in drought-resistant and -susceptible wheat cultivar during grain filling under field conditions
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Abscisic acid and cytokinin-induced carbohydrate and antioxidant levels regulation in drought-resistant and -susceptible wheat cultivar during grain filling under field conditions

机译：田间条件下抗旱和易感小麦品种灌浆过程中脱落酸和细胞分裂素诱导的碳水化合物和抗氧化剂水平调节

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摘要

The present investigation was conducted to determine the effect of cytokinin (CK), abscisic acid (ABA) and cytokinin/abscisic acid interaction (CK/ABA) on carbohydrate contents, oxidative stress and antioxidant components induced by drought stress in two wheat cultivars ( Triticum aestivum L.) of Pishgam and MV - 17 as tolerant and sensitive to drought during post - anthesis phase, respectively grown in field conditions during grain filling period. The most considerable effect of the treatments was exhibited 21 days after anthesis. Under drought conditions, the f lag leaf carbohydrate content including total soluble carbohydrate and reducing sugars increased in both cultivars while starch content was remarkably decreased in Pishgam as compared to MV - 17. Although Pishgam exhibited a significant increase in glucose, sucrose and fructose content but MV - 17 showed only a significant increase in fructose content. Relatively, CK/ABA increased total soluble carbohydrates, sucrose, an d fructose content more than other hormonal treatments. Also, ABA only reduced starch level of Pishgam, significantly. Nevertheless, level of glucose was significantly affected by none of the hormonal treatments. The tolerant cultivar exhibited less accumulation of hydrogen peroxide and malondialdehyde (MDA) in relation to more significant increa se of catalase (CAT) and peroxidase (POX) activities and α - tocopherol content under drought conditions. Among hormonal treatments, ABA and CK/ABA resulted in the highest activities of POX and CAT under both irrigation and drought conditions, respectively. But, higher accumulation of α - tocopherol was showed when CK foliar was applied. ABA and CK/ABA could decrease drought - induced hydrogen peroxide and MDA level, to some extent under drought conditions.
机译：本研究旨在确定细胞分裂素（CK），脱落酸（ABA）和细胞分裂素/脱落酸相互作用（CK / ABA）对两个小麦品种（Triticum）干旱胁迫诱导的碳水化合物含量，氧化胁迫和抗氧化成分的影响Pishgam和MV-17在花后期耐旱，对干旱敏感，分别在灌浆期在田间条件下生长。花后21天显示出最显着的治疗效果。在干旱条件下，与MV-17相比，两个品种的旗叶碳水化合物含量（包括总可溶性碳水化合物和还原糖）均增加，而Pishgam中的淀粉含量则显着降低。 MV-17显示果糖含量仅显着增加。相对而言，CK / ABA比其他激素治疗增加了总可溶性碳水化合物，蔗糖和果糖的含量。而且，ABA只能显着降低Pishgam的淀粉水平。然而，没有任何激素治疗对葡萄糖水平有显着影响。与干旱条件下过氧化氢酶（CAT）和过氧化物酶（POX）活性和α-生育酚含量的显着增加相比，耐性品种的过氧化氢和丙二醛（MDA）积累较少。在激素治疗中，ABA和CK / ABA分别在灌溉和干旱条件下导致POX和CAT的活性最高。但是，当施用CK叶面时显示出较高的α-生育酚积累。在干旱条件下，ABA和CK / ABA可以在一定程度上降低干旱引起的过氧化氢和MDA含量。

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