Response of Photosynthetic Capacity Heterosis to Nitrogen Rate in Maize
Field experiment was conducted in which two typical commercial maize hybrids Xianyu335 and Zhengdan958 and their parental inbred lines were grown at N 0 kg/ha(N0) and N 150 kg/ha(N150) respectively,to test nitrogen rate consequences on the relationship of photosynthetic capacity heterosis and yield heterosis.Photosynthetic capacity indexes such as Pn,Gs,Ci and Tr did not express heterosis at N0,yield heterosis was mainly come from heterosis of total dry matter and LAI.At N 150,besides the colony quantitative traits such as DM and LAI kept heterosis,the individual leaf photosynthetic functional traits such as Pn,Gs,Tr and SPAD value expressed strong heterosis.N 150 kg/ha application resulted in an increase in yield heterosis by 36.6％ compared to that at N0,and increases in heterosis of Pn,Gs,Tr and SPAD value separately by 35.8％,55.3％,50.9％ and19.6％,but the heterosis of total dry matter and LAI did not increase.The improvement of yield heterosis of maize hybrids under nitrogen application conditions primarily attributed to the increase in heterosis of photosynthetic capacity,it had nothing to do with the heterosis of total dry matter and LAI.
NETL
NSTL
万方数据
维普
