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Journal of Henan Agricultural University. 2019, (05) Core

Effects of submergence stress on partition of dry matter and yield of rice plantChinese Full TextEnglish Full Text (MT)

CHENG Tian;HU Jichao;LIN Zijing;Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disaster, Nanjing University of Information Science ＆ Technology;

Abstract: In order to quantitatively estimate and evaluate the losses of rice after flooding, a pot experiment was conducted to study the effects of different submergence stress and duration on dry matter partition and yield reduction of rice in different growth stages. The results showed that:（1） The partitioning coefficient of dry matter in different organs of rice plant of indica and japonica all changed under submergence stress at different growth stages. With submergence stress, the dry matter partitioning coefficient of leaves had a maximum increment followed by stem while it was decreased in root and a most decrease in panicle. The tendency of increase or decrease enlarged with the increase of submergence days.（2） Under the submergence stress, yields of all tested rice plants were reduced. The yield reduction caused by full submergence stress was greater than that by semi-submergence stress. With the increase of submergence durations, the yield reduction was increased; the degree of yield reduction at different growth stages was as following: flowering stage ＞ jointing stage ＞ filling stage ＞ tillerring stage. Additionally, indica rice had better flood resistance than that of japonica rice. In this study, the dry matter partitioning coefficient of different organs at different growth stages had a good quantitative relationship with the relative depth of flooding and the days of flooding. The regression coefficients were higher than 0.6 and met the requirement of the test for significance. The equations could describe the changes of rice plant growth and yield with the increase of the depth and duration of submergence stress. The quantified equations obtained by statistics analysis could lay a foundation for improving the deficiency of quantitative effects of submergence stress in rice growth model.
Keywords：

submergence stress; paddy rice; dry matter partitioning; yield;

  • DOI：

    10.16445/j.cnki.1000-2340.2019.05.003

  • Series：

    (D) Agriculture

  • Subject：

    Crop

  • Classification Code：

    S511

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