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《Journal of Nuclear Agricultural Sciences》 2008-06
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CORRELATION BETWEEN THE DISTRIBUTION OF PHOTOSYNTHATES OF FLAG LEAF AT FULL HEADING STAGE OF MAIN CROP AND YIELD OF POLINGENESIS RICE

ZHOU Wen-xin~1 YI Zhen-xie~1 TU Nai-mei~1 LI He-song~2(1.College of Agronomy,Hunan Agricultural University,Changsha,Hunan 410128; 2.College of Biological Science and Technology,Hunan Agricultural University,Changsha,Hunan 410128)  
Two line and three line hybrid rice combinations and their male parents were used as materials to study correlation between the distribution of photosynthates of flag leaf at full heading stage of main crop and the yield of paling enesis rice by(()~(14)C) trace technique.The results showed that:(1) 80%~90% of photosynthates of flag leaf at full heading stage was distributed to panicle in main crop and 10%~20% of remnant was in leaves and stems,and the most was in flag leaves.Only about 5% was in stems and sheathes,and the amount in different internodes of stems showed a trend of the 1~(st) the 2~(nd)the 3~(rd)the 4~(th) from the top.The ratio of remnant photosynthates in internodes below the 2nd to the total in stems was 1/3~2/3,and significant difference existed among varieties(combinations).(2) 52%~70% of remnant photosynthates in rice stubble was transported to palingenesis plants,and the part transported to panicles was most.(3) The more photosynthates distributed in stems and sheathes at maturity of main crop,especially in internodes below the 2nd from the top,the higher yield of palingenesis rice would get.(4) In this study,among four yield components,the grain number per panicle was the chief factor to affect yield of palingenesis rice.These results showed that choosing those varieties or combinations with bigger grain number per panicle and more remnant of photosynthates in stems and sheathes,especially in internodes below the 2nd at maturity of main crop would be benefit to gain higher yield of palingenesis rice under conditions in this study.
【Fund】: 国家自然科学基金项目(30370835);; 湖南省中青年基金资助项目(00TZYZ068);; 湖南省教育厅青年基金资助项目(02B011)
【CateGory Index】: S511
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