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

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

2013 06
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Effect of Hot Weather on Seed-setting and Grain Quality of Rice
TAN Jiang LI Yongchao PAN Xiaowu LIU Wenqiang SHENG Xinnian LI Xiaoxiang
(1Hunan Rice Research Institute, Hunan Academy of Agricultural Sciences, Changsha 410125, China) (2Longping Branch, Graduate School of Central South University, Changsha 410125, China)
rice seed setting rate grain quality high temperature correlation Cluster Analysis

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 flowering stage. The seed setting rate of all varieties decreased with increasing temperature, with an extremely significant correlation with the daily mean highest temperature at the heading stage and a significant correlation with the daily mean highest temperature 3 days before flowering. 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 significant or significant correlation with temperature in the corresponding stage. Cluster analysis showed that materials with similar heat-resistance had a higher similarity coefficient.


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