期刊
JOURNAL OF INTEGRATIVE AGRICULTURE
卷 15, 期 9, 页码 2002-2011出版社
ELSEVIER SCI LTD
DOI: 10.1016/S2095-3119(15)61262-X
关键词
specific leaf weight; leaf nitrogen content; leaf photosynthesis; mesophyll conductance; photosynthetic nitrogen use efficiency; stomatal conductance
资金
- National Natural Science Foundation of China [31301840]
- National Excellent Doctoral Dissertation of China [201465]
- Program for Changjiang Scholars and Innovative Research Team in University of China [IRT1247]
- Natural Science Foundation of Hubei Province, China [2013CFB201]
- Fundamental Research Funds for the Central Universities, China [2013PY107]
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 Narea as an indicator of photosynthetic performance.
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