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Analysis on Correlationship of Net Photosynthetic Rate with Yield and Its Components of Ratooning Rice

ZHANG Jian-fu1,ZHU Yong-sheng1,CAI Qiu-hua1,ZHUO Chuan-ying2,ZHANG Shang-shou2,ZHENG Rong-he2,XIE Hua-an1 (1Key Laboratory of Crop Germplasm Utilization between Fujian and Taiwan,Ministry of Agriculture,China/Fuzhou Branch,Chinese National Center for Rice Improvement/Fujian Engineering Laboratory of Crop Molecular Breeding/ Fujian Key Laboratory of Rice Molecular Breeding/Rice Research Institute,Fujian Academy of Agricultural Sciences,Fuzhou 350003,China;2 Extension Center of Agricultural Technology,Youxi County,Youxi 365104,China)  
The net photosynthetic rate of flag leaf was measured at the filling stage and maturity stage of ratooning rice with thirteen hybrid rice combinations as materials.The net photosynthetic rate at the filling stage of ratooning rice was significantly higher than that at the maturity stage,and the difference in the photosynthetic rate at the filling stage was more than that at the maturity stage among all the combinations,and the net photosynthetic rate was significantly different at the same stage among different combinations.The net photoynthetic rate at the filling stage was positively correlated with the yield of ratooning rice,and that at the maturity stage was significantly and negatively correlated with the yield of ratooning rice.In addition,the net photosynthetic rate at the filling stage was significantly and positively correlated with the seed setting rate.
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