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《ACTA BOTANICA BOREALI-OCCIDENTALIA SINICA》 1998-04
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EFFECT OF SOURCE SINK MANIPULATION ON PHOTOSYNTHETIC RATE AND PARTITIONING OF 14 C ASSIMILATE DURING GRAIN FILLING IN WINTER WHEAT PLANT

He Mingrong,Wang Zhenlin and Cao Hongming ( Shandong Agricultural University ,Taian 271018)  
Wheat cultivars of different grain weight (representing small of large grain cultivars respectively) were selected as experimental materials,the effect of removal of top two spikelets on 1000 grain weight,grain number per ear,grain weight per ear,average grain filling rate,average increment rate of ear weight,photosynthetic rate and partitioning of 14 C assimilate during grain filling in winter wheat plant were studied.When top two spikelets were removed at anthesis,the grain weight increased,grain number per ear decreased or unchanges,but the decrease percentage in grain number per ear was much smaller than that in spikelets removed,the average grain filling rate and average in crement rate of grain weight per ear increased accordingly,resulting in compensatory increase of grain weight per ear.Compared with large grain cultivars,the increase degree in grain of small grain cultivars were much higher.Resulting from strenthen sink activity,the photosynthetic rate of small grain cultivars at middle and final stage of grain filling and partitioning of 14 C assimilate into grain of all cultivars were increased.Conclusively,both the photosynthetic rate and the partitioning of 14 C assimilate were controled by sink activity,but the regulation way and degree were dependent on the types of cultivar.
【CateGory Index】: S512.101
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