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GrainGenes Reference Report: JPY-159-891

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Reference	JPY-159-891
Title	Genotypic variation of gas exchange parameters and carbon isotope discrimination in winter wheat
Journal	Journal of Plant Physiology
Year	2002
Volume	159
Pages	891-898
Author	Xue Q Soundararajan M Weiss A Arkebauer TJ Baenziger PS
Abstract	Summary: Carbon isotope discrimination (delta) has been suggested as an indirect selection tool for plant water use efficiency and yield potential in wheat (Triticum aestivum L.). Plant available soil water content (PASW) and vapor pressure deficit (VPD) are among some important factors affecting gas exchange and delta. A two-year field experiment was conducted to (1) investigate the differences in gas exchange parameters: net CO2 assimilation rate (An), stomatal conductance (Gs), intercellular CO2 concentration (Ci), An/Ci, transpiration rate (E), water use efficiency (WUE), and delta between older and newer cultivars in winter wheat; and (2) determine the relationships between delta and gas exchange parameters, WUE and grain yield as influenced by PASW and VPD. Differences in An and An/Ci between the two years was influenced more by PASW conditions than by cultivar. In general, WUE decreased in all cultivars when PASW <50%. There were no correlations between gas exchange parameters, WUE, and grain yield under water stress. In the wetter growing season, the two older cultivars had higher WUE than the two newer cultivars. There was a negative correlation between delta and WUE with older cultivars tending to have a lower delta and higher WUE than the newer cultivars. A positive correlation between delta and grain yield suggests that delta values can be used as a supplementary selection tool for higher yielding winter wheat cultivars
Keyword	[ Hide all but 1 of 39 ] assimilation carbon carbon isotope discrimination concentration content difference discrimination exchange field field experiment gas exchange genetic variation genotype genotypic variation isotope discrimination maximum yield parameters season selection soil soil water soil water content stable isotopes stomatal conductance stomatal resistance stress tool transpiration transpiration rate triticum triticum aestivum use efficiency water water content water stress water use water-use winter yield

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