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Water-use efficiency in cork oak (Quercus suber) is modified by the interaction of water and light availabilities

Aranda, Ismael and Pardos, Marta and Puertolas Simon, Jaime and Jimenez, Maria Dolores and Pardos, Jose Alberto (2007) Water-use efficiency in cork oak (Quercus suber) is modified by the interaction of water and light availabilities. Tree Physiology, 27 (5). pp. 671-677. ISSN 0829-318X

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Abstract

We studied the interaction of light and water on water-use efficiency in cork oak (Quercus suber L.) seedlings. One-year-old cork oak seedlings were grown in pots in a factorial experiment with four light treatments (68, 50, 15 and 5% of full sunlight) and two irrigation regimes: well watered (WW) and moderate drought stress (WS). Leaf predawn water potential, which was measured at the end of each of two cycles, did not differ among the light treatments. Water-use efficiency, assessed by carbon isotope composition (delta C-13), tended to increase with increasing irradiance. The trend was similar in the WW and WS treatments, though with lower delta C-13 in all light treatments in the WW irrigation regime. Specific leaf area increased with decreasing irradiance, and was inversely correlated with delta C-13. Thus, changes in delta C-13 could be explained in part by light-induced modifications in leaf morphology. The relationship between stomatal conductance to water vapor and net photosynthesis on a leaf area basis confirmed that seedlings in higher irradiances maintained a higher rate of carbon uptake at a particular stomatal conductance, implying that shaded seedlings have a lower water-use efficiency that is unrelated to water availability.

Item Type: Article
Journal or Publication Title: Tree Physiology
Uncontrolled Keywords: photosynthesis ; uptake ; ACER-NEGUNDO ; NITROGEN CONCENTRATION ; stomatal conductance ; CO2 TRANSFER CONDUCTANCE ; water potential ; SYLVATICA L. SEEDLINGS ; carbon isotope composition ; drought ; LEAF DELTA-C-13 ; PHYSIOLOGICAL-RESPONSES ; specific leaf area ; GAS-EXCHANGE ; shade ; PINUS-SYLVESTRIS L. ; PHOTOSYNTHETIC CAPACITY ; CARBON-ISOTOPE DISCRIMINATION
Subjects:
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 62642
Deposited By: ep_importer_pure
Deposited On: 15 Mar 2013 16:45
Refereed?: Yes
Published?: Published
Last Modified: 21 Sep 2017 05:27
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/62642

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