Physiological Basis on the Yield in Japonica Rice with Different N Application Efficiency during the Later Development Stage

doi:10.7668/hbnxb.2013.05.031

Abstract

Abstract: The objective of this study was to identify the difference of photosynthesis in Japonica rice of Jiangsu under different nitrogen applications;7 rice genotypes including three middle Japonica rice( Wuyujing 3,Nanjing 45,02102) and five late Japonica rice(Wuyunjing 7,Nanjing 44,Nanjing 46,Nanjing 5055) in the pot experiments were chosen to measure their photosynthesis characteristics,NR,GS,GOGAT,GDH and antioxidant enzyme activi-ties of flag leaves at the flowering stage under different nitrogen applications (150. 0 kg/ha:LN、300. 0 kg/ha:MN, 450. 0 kg/ha:HN ) and their yield component were investigated after harvest. The results showed that the grain weight per plant of Nanjing 45 were 118. 47%,129. 11%,132. 58%,respectively of those in the control Wuyujing 3 under LN,MN and HN,while those of Nanjing 44 were 1.79%,25.10%and 29.79%,respectively higher than the control Wuyunjing 7 in corresponding treatments. With the amount of nitrogen increases,rice plants increase the a-bility to use high light intensity and alleviate the decrease of the maximum net photosynthetic rate ( Pnmax ) of flag leaves at the 21 d after flowering;Under high concentrations of CO₂,the rice varieties increased P nmax by improving their apparent carboxylation efficiency ( ACE) under MN condition. From the perspective of antioxidant capacity,the increase of superoxide dismutase ( SOD ) was one of the important antioxidant enzymes. Analysis results show that the photosynthetic capacity at 7 d after flowering was more related to the weight of grains. On the other hand, the photosynthetic ability and the antioxidant capacity of at 35 d after flowering were more related to their seed-setting rate.The super rice varieties such as Nanjing 44 and Nanjing 45 are more suitable for the cultivation in medium ni-trogen conditions by inducing the NR and the antioxidant capacity of different time after flowering,which they resul-ted in the high photosynthetic capability to obtain the high yield. Selection the rice varieties with high ability of pho-tosynthesis would be an important strategy both for high yield and to decrease the N application in future. It would be helpful to increase the yield and reduce the N application by breeding the rice variety with high photosynthetic a -bility in future.

Key words: Rice, Photosynthesis, Nitrogen, CO2, Antioxidant enzyme, Yield

CLC Number:

S511.22

JIN Lei, LI Xia, WEI Xiao-dong, LIU Xiao-long, WANG Cai-lin, ZHONG Wei-gong. Physiological Basis on the Yield in Japonica Rice with Different N Application Efficiency during the Later Development Stage[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2013, 28(5): 175-186. doi: 10.7668/hbnxb.2013.05.031.

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