Varietal difference in the correlation between leaf nitrogen content and photosynthesis in rice (Oryza sativa L.) plants is related to specific leaf weight

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• 作者：Xi LIU ; ^{liuxi2008529@qq.com" class="auth_mail" title="E-mail the corresponding author} ; Yong LI ; ^{liyong@mail.hzau.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：specific leaf weight ; leaf nitrogen content ; leaf photosynthesis ; mesophyll conductance ; photosynthetic nitrogen use efficiency ; stomatal conductance
• 刊名：Journal of Integrative Agriculture
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：15
• 期：9
• 页码：2002-2011
• 全文大小：524 K

文摘

Increasing leaf photosynthesis per area (A) is of great importance to achieve yield further improvement. The aim of this study was to exploit varietal difference in A and its correlation with specific leaf weight (SLW). Twelve rice cultivars, including 6 indica and 6 japonica varieties, were pot-grown under two N treatments, low N (LN) and sufficient N (SN). Leaf photosynthesis and related parameters were measured at tillering stage. Compared with LN treatment, A, stomatal conductance (g_s), mesophyll conductance (g_m), leaf N content (N_area), and chlorophyll content were significantly improved under SN treatment, while SLW and photosynthetic N use efficiency (PNUE) were generally decreased. Varietal difference in A was positively related to both g_s and g_m, but not related to N_area. This resulted in a low PNUE in high N_area leaves. Varietal difference in PNUE was generally negatively related to SLW. Response of PNUE to N supply varied among different rice cultivars, and interestingly, the decrease in PNUE under SN was negatively related to the decrease in SLW. With a higher N_area, japonica rice cultivars did not show a higher A than indica rice cultivars because of possession of high-SLW leaves. Therefore, varietal difference in A was not related to N_area, and SLW can substantially interfere with the correlation between A and N_area. These findings may provide useful information for rice breeders to maximize A and PNUE, rather than over reliance on N_area as an indicator of photosynthetic performance.