Relationship Between Grain Filling and Assimilation Supply in Two Winter Wheat Cultivars with Different Spike Type

doi:10.3321/j.issn:1000-7091.2004.02.012

Abstract

Abstract: Two winter wheat cultivars with large-spike type cultivar Yumai 66 and multiple-spike cultivar Yumai 49,were used to study their C metabolic characteristics and grain filling. Photosynthetic rate in flag leaf of Yumai 66 was superior to Yumai 49 during later filling stage,and WSC content in grain of Yumai 66 was higher than that of yumai 49 during 0-30 d after anthesis, which showed that source had strong supplying ability of assimilating matter. WSC content in flag leaf of Yumai 66 was lower than that of yumai 49 during later filling stage,and starch content was also lower than that of yumai 49 during the whole filling stage,it revealed that large-spike type cultivar maintained stronger flow activity and rapid translocation of assimilating matter. Changes of starch accumulating rate in grain appeared to be a single-peak curve,but the peak of Yumai 66 came a little later than that of Yumai 49,but it sustained a long time, the peak of yumai 66 was higher than that of Yumai 49. Grain filling rate had the same trend during the later stage, it presented significant positive correlation between grain filling rate and starch accumulating rate. It showed that Yumai 66 maintained stronger sink activity during the later stage and had much sink volume.

Key words: Winter wheat, Different spike-type varieties, Grain filling, Assimilating matter

CLC Number:

GUO Tian-cai, FENG Wei, XIA Bai-gen, FANG Bao-ting, WANG Shu-li. Relationship Between Grain Filling and Assimilation Supply in Two Winter Wheat Cultivars with Different Spike Type[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2004, 19(2): 44-48. doi: 10.3321/j.issn:1000-7091.2004.02.012.

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