Response of Malondialdehyde Content in Leaves and Yield Traits of Super Hybrid Rice to Water Deficit

Abstract

Abstract: With three super hybrid rice combinations (Liangyoupeijiu, Guodao 6 and Ⅱ you 602) and a conventional hybrid rice combination Shanyou 63 as materials, response of the malondialdehyde (MDA) content in leaves and yield traits for these rice materials to water deficit from panicle initiation to 30 days after flowering(DAF) was studied in a pot experiment. Water deficit accelerated membrane lipid peroxidation, thus led to an increase in MDA content in rice leaves. Moreover, the MDA content rose with the leaf position down. The MDA contents in the 3rd leaf from top was the highest, followed by the 2nd leaf from top and the flag leaf. The MDA content in rice leaves was enhanced under water deficit, especially in the lower position leaves, which caused damage to enzyme and cell membrane, ultimately affected cell normal physiological metabolism. Water deficit had various influence on yield and its components. The yield reduction due to water deficit during 0-15 DAF and 15-30 days after panicle initiation(DAPI) amounted to 27.5% and 26.9%, respectively, followed by 15-30 DAF(24.2%). Compared with normal water supply, the yield of rice under water deficit declined significantly, which was mainly caused by obvious reduction of seed setting rate and 1000grain weight. The changes in the MDA content responded to water deficit correlated with plant growth and development, final output of rice grains at a certain extent. Water deficit exerted less influence on MDA content in rice leaves and yield traits of super hybrid rice combinations than that of conventional hybrid rice combination. Based on the relationship between stress degree and effect, stress lasting time and effect, the opinion on the relationship between growing course and effect was put forward and discussed.

Key words: super hybrid rice, water deficit, malondialdehyde content, yield traits, physiological response

摘要： 通过严格控制土壤水分的盆栽试验，研究了超级杂交稻组合叶片丙二醛（MDA）含量对不同水分亏缺的生理响应及产量性状受到的影响，分析了叶片MDA含量与产量性状间的关系。结果表明,不同生育时段的水分亏缺均导致叶片MDA含量显著增加，受影响程度随控水时段的推迟而加重。随着叶位的降低，叶片MDA含量呈显著上升趋势，倒3叶最高，其次是倒2叶，剑叶相对较低，水分亏缺导致叶片尤其是下部叶片的MDA含量显著升高。水分亏缺均导致产量显著降低，开花至花后15 d和穗分化后15~30 d的控水处理影响较大，其次是花后15~30 d的控水处理，各组合减产均在20%以上，原因主要在于结实率和千粒重下降。叶片MDA含量的生理响应与稻株生长发育和最终产量表现存在相关性，不同组合的叶片MDA含量和产量性状对水分亏缺的响应有所不同，超级杂交稻组合所受影响小于普通杂交稻组合。作物对水分亏缺的响应除了表现胁迫程度效应关系和胁迫时间效应关系，还存在生育进程效应关系。

关键词: 超级杂交水稻, 水分亏缺, 丙二醛含量, 产量性状, 生理响应

ZHANG Weixing ,ZHU Defeng ,ZHAO Zhi ,LIN Xianqing ,ZHANG Yuping,CHEN Huizhe. Response of Malondialdehyde Content in Leaves and Yield Traits of Super Hybrid Rice to Water Deficit[J]. Chinese Journal of Rice Science.

张卫星朱德峰赵致林贤青, 张玉屏, 陈惠哲. 超级杂交稻叶片丙二醛含量以及产量性状对水分亏缺的响应[J]. 中国水稻科学.

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