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首页> 外文期刊>Journal of Agronomy and Crop Science/Zeitschrift fur acker-und pflanzenbau >Acquired Thermo-Tolerance and Trans-Generational Heat Stress Response at Flowering in Rice
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Acquired Thermo-Tolerance and Trans-Generational Heat Stress Response at Flowering in Rice

机译：水稻开花期获得的耐热性和转基因热胁迫响应

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摘要

In rice, pre-exposure to sublethal treatment followed by harsh lethal treatment is known to improve tolerance of different abiotic stresses at the vegetative stage within and across generations. Our major aim was to test the phenomenon of thermo-tolerance at flowering across (trans)-generations and within generation using rice cultivars contrasting for heat stress tolerance at flowering. To test trans-generational response, plants were exposed to higher temperature at flowering stage and seeds obtained from previous generations were exposed to heat stress during flowering, which recorded significantly lower fertility when exposed to the same degree of stress in their subsequent generations. A pre-acclimation to moderately high acclimating temperatures imposed over three different durations during the vegetative and initial reproductive stage showed positive response in the tolerant N22, particularly under severe heat stress (40 degrees C). This finding indicates the possibility of acquiring ameliorative thermo-tolerant mechanisms at anthesis, restricted to tolerant genetic backgrounds to combat subsequent harsh conditions within the same generation. However, trans-generational memory was ineffective in mitigating spikelet sterility losses in both tolerant and susceptible backgrounds. Rice is extremely sensitive to heat stress during flowering; hence, similar exercise across other crops of interest needs to be carried out before generalizing conclusions.
机译：在水稻中，先暴露于亚致死处理，然后再进行严格的致死处理，可以提高水稻在代代之间和代代之间的营养阶段对不同非生物胁迫的耐受性。我们的主要目标是使用水稻品种对比开花时的热胁迫耐受性，来测试（反式）世代和世代内部开花时的耐热现象。为了测试跨世代的反应，在开花期将植物置于较高的温度下，将从前几代获得的种子在开花过程中置于热胁迫下，当在其后代中以相同程度的胁迫暴露时，其生育力明显降低。在营养和初始生殖阶段，在三个不同的持续时间内施加的预适应到适中的高适应温度在耐性N22中表现出积极的响应，尤其是在严重的热应激（40摄氏度）下。这一发现表明，有可能在开花期获得改良的耐热机制，但仅限于耐受的遗传背景，以抗击同一代中的后续严酷条件。然而，在耐受和易感背景下，跨代记忆均无法有效缓解小穗不育性的丧失。水稻在开花过程中对热胁迫极为敏感。因此，在总结结论之前，需要对其他感兴趣的作物进行类似的研究。

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