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首页> 外文期刊>African Journal of Biotechnology >Is salinity tolerance of rice lines concerned to endogenous ABA content or to the cellular ability for ABA synthesis under stress?
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Is salinity tolerance of rice lines concerned to endogenous ABA content or to the cellular ability for ABA synthesis under stress?

机译：水稻的耐盐性与内源ABA含量或胁迫下ABA合成的细胞能力有关吗？

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In this work we tested its putative relationship of Abscisic acid with the degree of tolerance to this abiotic stress. For this purpose, we have examined the responses of sensitive (IR29) and tolerant (IR651) varieties of indica rice (Oryza sativa?L.) to a range of salinity (0 (control) and 90 mM NaCl. Shoot and root dry weight reduced and leaf Na concentration increased in response to salinity for both cultivars with a higher extent of sensitivity. Tolerance of IR29 to saline stress was generally improved by ABA treatment and leaves Na content reduced to the level of their respective control treatment. This ABA effect was evident in IR29 with low tolerance, as their ability to recover from stress increased up to seven fold. Independence of the saline treatment and the absolute endogenous leaf ABA content in sensitive variety was significantly more than that of the tolerant one. However, with stress, the increase in endogenous ABA synthesis was higher in tolerant than in sensitive varieties. These data together with those obtained by using fluridone, an inhibitor of ABA synthesis, suggest first of all, that there was differential sensitivity to ABA in the tolerant and sensitive leaves cultivars and enhanced concentrations at tolerant levels acted primarily to maintain root and shoot growth and secondly, the differences in the level of tolerance to saline stress is related to their different capacity of ABA synthesis under stress conditions.
机译：在这项工作中，我们测试了脱落酸与这种非生物胁迫的耐受程度之间的推定关系。为此，我们研究了sensitive稻（Oryza sativa？L。）的敏感（IR29）和耐性（IR651）品种对盐度（0（对照）和90 mM NaCl）的响应。敏感性提高了两个品种对盐分的响应，降低了叶片中的Na含量，提高了叶片中的Na含量;通过ABA处理，IR29对盐胁迫的耐受性通常得到了提高，并且叶片中的Na含量降低到了各自的对照处理水平。在低耐受性的IR29中很明显，因为它们从胁迫中恢复的能力提高了7倍;在敏感品种中，盐水处理和绝对内源叶ABA含量的独立性明显高于耐性品种。耐性方面，内源ABA合成的增加要高于敏感品种，这些数据以及使用ABA合成抑制剂氟啶酮得到的数据首先表明，耐性和感性叶片品种对ABA的敏感性不同，在耐性水平上的浓度升高主要是为了维持根和茎的生长，其次，耐盐胁迫水平的差异与它们对ABA合成能力的不同有关。在压力条件下。

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