Exogenous Application of Plant Growth Regulators Induce Chilling Tolerance in Direct Seeded Super and Non-super Rice Seedlings through Modulations in Morpho-physiological Attributes

文献类型： 外文期刊

第一作者： Mo, Z. W.

作者： Mo, Z. W.;Ashraf, U.;Pan, S. G.;Kanu, A. S.;Duan, M. Y.;Tian, H.;Tang, X. R.;Mo, Z. W.;Ashraf, U.;Pan, S. G.;Kanu, A. S.;Duan, M. Y.;Tian, H.;Tang, X. R.;Li, W.

作者机构：

关键词： antioxidant enzymes;chilling stress;rice seedlings;survival rates

期刊名称：CEREAL RESEARCH COMMUNICATIONS （ 影响因子：0.85； 五年影响因子：1.067 ）

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收录情况： SCI

摘要： Recently, super rice has gained much importance due to its high yield potential while exogenous application of plant growth regulators (PGRs) is an important aspect in plant development and defense responses under stress conditions. In this study we conducted two pot experiments. Firstly, four super rice cultivars, viz. Peizataifeng, Huayou 213, Yuxiangyouzhan and Huahang 31 were subjected to a series of five chilling temperatures, i.e. 11 degrees C, 12 degrees C, 13 degrees C, 14 degrees C and 15 degrees C (day/night) for about 25-27 days. Secondly, seeds of Peizataifeng (super rice) and Yuejingsimiao 2 (non-super rice) were then treated with different combinations of salicylic acid (SA), brassinolide (BR), calcium chloride (CaCl2) and fulvic acid (FA) and then exposed to chilling stress at 13 degrees C for four days. Resultantly, Peizataifen (super rice) was found with the lowest seedling survival rate at all chilling temperatures among all four super rice cultivars, however, it was still found more resistant when compared with Yuejingsimiao 2 (non-super rice) in the second experiment. Furthermore synergistic effect of all PGRs alleviated low temperature stress in both rice cultivars by improving seedling survival rates, leaf area, seedling dry weight, seedling height, root morphology and by modulating antioxidant enzymes, improving proline content and lowering lipid peroxidation.

分类号： S5

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