期刊
PLANT CELL AND ENVIRONMENT
卷 34, 期 6, 页码 962-979出版社
WILEY-BLACKWELL
DOI: 10.1111/j.1365-3040.2011.02297.x
关键词
Prunus dulcis; deficit irrigation; leaf age; leaf structure; mesophyll conductance; nitrogen content; photosynthetic capacity; stomatal conductance; temperature response
资金
- European Commission [FP6-2004-FOOD-3B-C023120: IRRI-QUAL]
- Spanish Ministry of Science and Technology [AGL2002-04048-C03-02]
- Spanish Ministry of Education
- Fundacion Ramon Areces (Madrid, Spain)
Very few studies have attempted to disentangle the respective role of ontogeny and water stress on leaf photosynthetic attributes. The relative significance of both effects on photosynthetic attributes has been investigated in leaves of field-grown almond trees [Prunus dulcis (Mill.) D. A. Webb] during four growth cycles. Leaf ontogeny resulted in enhanced leaf dry weight per unit area (W(a)), greater leaf dry-to-fresh weight ratio and lower N content per unit of leaf dry weight (N(w)). Concomitantly, area-based maximum carboxylation rate (V(cmax)), maximum electron transport rate (J(max)), mesophyll conductance to CO(2) diffusion (gm)' and light-saturated net photosynthesis (A(max)) declined in both well-watered and water-stressed almond leaves. Although g(m) and stomatal conductance (g(s)) seemed to be co-ordinated, a much stronger coordination in response to ontogeny and prolonged water stress was observed between g(m) and the leaf photosynthetic capacity. Under unrestricted water supply, the leaf age-related decline of A(max) was equally driven by diffusional and biochemical limitations. Under restricted soil water availability, A(max) was mainly limited by g(s) and, to a lesser extent, by photosynthetic capacity and g(m). When both ontogeny and water stress effects were combined, diffusional limitations was the main determinant of photosynthesis limitation, while stomatal and biochemical limitations contributed similarly.
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