ID:
publications-420
Type:
PEER REVIEWED ARTICLE
Year:
2011
Authors:
GREGORIO EGEA , MARĂA M. GONZĂLEZ-REAL , ALAIN BAILLE , PEDRO A. NORTES , ANTONIO DIAZ-ESPEJO
Title:
Disentangling the contributions of ontogeny and water stress to photosynthetic limitations in almond trees
Venue/Journal:
DOI:
10.1111/j.1365-3040.2011.02297.x
Research type:
IoT & Sensors
Water System:
Precipitation & Ecological Systems
Technical Focus:
Abstract:
ABSTRACTVery 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 fieldâgrown almond trees [Prunus dulcis (Mill.) D. A. Webb] during four growth cycles. Leaf ontogeny resulted in enhanced leaf dry weight per unit area (Wa), greater leaf dryâtoâfresh weight ratio and lower N content per unit of leaf dry weight (Nw). Concomitantly, areaâbased maximum carboxylation rate (Vcmax), maximum electron transport rate (Jmax), mesophyll conductance to CO2 diffusion (gm)âČ and lightâsaturated net photosynthesis (Amax) declined in both wellâwatered and waterâstressed almond leaves. Although gm and stomatal conductance (gs) seemed to be coâordinated, a much stronger coordination in response to ontogeny and prolonged water stress was observed between gm and the leaf photosynthetic capacity. Under unrestricted water supply, the leaf ageârelated decline of Amax was equally driven by diffusional and biochemical limitations. Under restricted soil water availability, Amax was mainly limited by gs and, to a lesser extent, by photosynthetic capacity and gm. 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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245159
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