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Acta Agron Sin ›› 2009, Vol. 35 ›› Issue (12): 2296-2303.doi: 10.3724/SP.J.1006.2009.02296

• RESEARCH ACTIVITIES • Previous Articles     Next Articles

Evaluation of Drought Tolerance and Fertility Traits for Rice Maintainer Lines Extensively Used in China

TAO Long-Xing,FU Guan-Fu,SONG Jian,LE Ming-Kai,WANG Xi*   

  1. National Key Laboratory of Rice Biology，China National Rice Research Institute，Hangzhou 310006，China
  • Received:2009-05-19 Revised:2009-08-26 Online:2009-12-10 Published:2009-10-13
  • Contact: WANG Xi,E-mail:wangxi359@sina.com

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Abstract:

By monitoring soil moisture using both soil moisture meter and soil sampling method, we evaluated the drought tolerance of maintainer lines at panicle stage. Results showedthat: (1) the maintainer lines K22-B, Jin 23-B, and II-32-B were drought-insensitive at panicle stage, while Zhenshan 97-B, Zhong 9-B, and Xieqingzao-B were drought-sensitive; (2) the tested maintainer lines were more sensitive to drought stress at flowering stage (from pollen filling stage to spikelets filling stage) than at booting stage (from meiosis stage of pollen mother cell to pollen filling stage); (3) drought stress at booting stage mainly injured the spikelet fertility and there was a positive correlation between stress index and percentage of unfilled grains (r = 6988**), and drought stress at flowering stage injured both the fertility and plumpness of spikelets, the percentage of unfilled grains and the percentage of non-fully filled grains exhibited a positive correlation with stress index (r = 0.7660** and r = 0.5230 respectively); (4) there was no correlation between drought tolerance at panicle stage and grain setting characteristics under normal condition．

Key words: Rice maintainer line, Drought stress, Stress index, Flowering stage

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