Abstract
The dynamic correlation between yield and above-and below-ground biomass and the dynamic partition of biomass of high,medium and low yield lines were studied by using the population of recombinant inbred lines NJRIKY derived from a cross between parents with different biomass and yield potential levels to obtain some information for dynamic control of biomass accumulation in high yield breeding and management of soybean.The results obtained were as follows:(1)Yield was significantly and positively correlated with above-and below-ground biomass accumulation,their correlation increased during the growing stages and the peak correlation occurred at seed filling stage(R5–R6)with r=0.76 for below-ground biomass and 0.79 for above-ground biomass.(2)The high yield lines(2 500–2 800 kg ha- 1)had a significantly higher below-ground and above-ground biomass accumulation than the medium yield and low yield lines.Both below-and above-ground biomass accumulation reached the peak at seed filling stage with the highest below-ground biomass of 660–700 kg ha- 1and above-ground biomass of 720–780 kg ha- 1at R5.(3)The composition of high yield lines was not consistent in the two years.Lines with decreased yield had also a decreased biomass,which demonstrated reduction of biomass accumulation caused by different environments was the reason for yield decrease.(4)The dynamic partition of biomass to stem and petiole during growing stages in high yield lines(30.8%and 10.6%at R5,respectively)was significantly higher than that in medium and low yield lines and the dynamic partition of biomass to leaf and root during growing stages in high yield lines(34.1%and 9.7%at R5,respectively)was significantly lower than that in medium and low yield lines.The results implied that the more increase of yield in the future depends on the comprehensive ge- netic improvement of both biomass and harvest index and the successive advancement of growth regulation technology in soy-bean.
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