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Acta Agron Sin ›› 2009, Vol. 35 ›› Issue (12): 2243-2251.doi: 10.3724/SP.J.1006.2009.02243

• TILLAGE & CULTIVATION · PHYSIOLOGY & BIOCHEMISTRY • Previous Articles     Next Articles

Photosynthetic Characteristics of Flag Leaf in Rice Genotypes with Different N Use Efficiencies

WEI Hai-Yan1,2,ZHANG Hong-Cheng1,2,*,MA Qun1,DAI Qi-Gen1,2,HUO Zhong-Yang1,2，XU Ke12，ZHANG Qing1，HUANG LI-Fen1   

  1. 1Jiangsu Province Key Laboratory of Crop Genetics and Physiology；2Innovation Center of Rice Cultivation Technology in Yangtze Valley,Ministry of Agriculture,Yangzhou University,Yangzhou 225009,China
  • Received:2009-05-08 Revised:2009-07-19 Online:2009-12-10 Published:2009-10-13
  • Contact: ZHANG Hong-Cheng,E-mail:hczhang@yzu.edu.cn

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Abstract:

N is yet the most important and largest input required in rice production although over use of N causes so many environment problems. N use efficiency is different in different rice genotypes. Therefore it is necessary to identify the physiological mechanism of N absorption and utilization in different rice genotypes. In this research, field experiment with 225 kg ha-1 N fertilizer application was carried out in 2006 on the farm of Yangzhou University, Jiangsu province, China. Twelve rice genotypes (six N-efficient and six N-inefficient) selected from one hundred and twenty rice cultivars grown in Yangzhou during 2004 and 2005 were adopted to investigate the photosynthetic characteristics of flag leaf in rice genotypes with different N use efficiencies. Relationships between photosynthetic physiological characteristics of flag Leaf and N use efficiency as well as seed setting abilities were also analyzed. Results showed that, during the period of grain filling, the photosynthetic indexes of flag leaf including chlorophyll content, nitrogen content, net photosynthetic rate, the photosynthetic function duration, the maximum photochemical efficiency (Fv/Fm), the potential photochemical efficiency of photosystem II (Fv/Fo), the actual photochemical efficiency of photosystem II (ΦPSII), the photochemical quenching coefficient (qP) and the non-photochemical quenching coefficient (qN) of N efficient genotypes were obviously higher than those of N inefficient genotypes. All photosynthetic indexes of flag leaf above positively correlated to N use efficiency and seed setting abilities. And it could be concluded that, for N efficient genotypes, they had better characteristics of photosynthesis and longer photosynthetic function duration. Meanwhile, the PS II of N efficient genotypes was steady which had larger potential to convert light energy into electrochemical energy, and the non-photochemical quenching could protect the photosynthetic apparatus further. Therefore, the accumulation of photosynthate and the seed setting abilities of N efficient genotypes were better than those of N inefficient genotypes. And the N absorption and utilization of N efficient genotypes were also enhanced through the feedback regulation of root and shoot.

Key words: Rice, N use efficiency, Photosynthetic physiological characteristics, Correlation


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