DOI: 10.3724/SP.J.1145.2013.00935

Chinese Journal of Appplied Environmental Biology (应用与环境生物学报) 2013/19:6 PP.935-940

Effect of Hot Weather on Seed-setting and Grain Quality of Rice

A multiple sowing experiment was conducted with 19 rice lines (9311 and N22 as control) in Hunan, China to investigate the seed setting rate, grain quality, and their correlation with temperature at corresponding stages. The similarity coefficients among different rice lines were analyzed with cluster analysis. Seeds were sown for three times at a 7 day interval. The result showed that all varieties suffered a high temperature above 38 ℃ at fl owering stage. The seed setting rate of all varieties decreased with increasing temperature, with an extremely signi fi cant correlation with the daily mean highest temperature at the heading stage and a signi fi cant correlation with the daily mean highest temperature 3 days before fl owering. However, different rice lines showed a different reduction of seed setting rate. Head rice rate and area of white core belly also showed an extremely signi fi cant or signi fi cant correlation with temperature in the corresponding stage. Cluster analysis showed that materials with similar heat-resistance had a higher similarity coeffi cient. Fig 5, Tab 3, Ref 19

Key words:rice,seed setting rate,grain quality,high temperature,correlation,Cluster Analysis

ReleaseDate:2015-04-15 08:42:19

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