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Changes in leaf morphology and composition with future increases in CO2 and temperature revisited. Wheat in field chambers.

AuthorsGutiérrez Rodríguez, Elena; Gutiérrez del Pozo, Diego ; Morcuende, Rosa ; Verdejo, Ángel L. ; Kostadinova, Svetla; Martínez-Carrasco, Rafael ; Pérez Pérez, Pilar
KeywordsElevated CO2
elevated temperature
leaf mass per area
leaf morphology
leaf composition
water content
Issue Date2009
CitationJournal of Plant Growth Regulation 28, 349-357 (2009)
AbstractWhether leaf morphology is altered by future increases in atmospheric CO2 and temperature has been re-examined during three years in wheat grown in field chambers at two levels of nitrogen supply. Flag leaf fresh and dry mass, area, volume, and ratios of these parameters, as well as the contents of water, chlorophyll, non-structural carbohydrates and nitrogen compounds have been determined at anthesis and 14 days later. High CO2 decreased, rather than increased as reported in the literature, leaf mass per area and leaf density, and increased water content per area and volume and water percentage. Warmer temperatures also decreased leaf mass per area, but did not affect density or water per area or volume, while they increased water percentage. Nitrogen supply did not change CO2 and temperature effects on leaf morphology. Non-structural carbohydrates increased and nitrogen compounds decreased in elevated CO2, and the sum of these compounds decreased with warmer temperatures. These changes in composition did not account for modifications of leaf morphology. We conclude that increases in atmospheric CO2 and temperature after leaf initiation can decrease leaf mass per area, and elevated CO2 can also decrease leaf density, due to decreases in leaf structural compounds. The functional significance of these changes is probably a decrease in photosynthetic capacity per unit leaf area.
Publisher version (URL)http://www.springerlink.com/content/k65223772942/?p=efdcec90a4fd4b21bfbb6d805e2ec73f&pi=0
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