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GrainGenes Reference Report: CRS-41-677

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Reference	CRS-41-677
Title	Stability of carbon isotope discrimination and grain yield in durum wheat
Journal	Crop Science
Year	2001
Volume	41
Pages	677-681
Author	Merah O Deleens E Souyris I Nachit M Monneveux P
Abstract	Summary: Carbon isotope discrimination (delta) has been proposed as an indirect selection criterion for transpiration efficiency and grain yield in bread wheat (Triticum aestivum L.) and barley (Hordeum vulgare L.), with potential value for durum wheat (Triticum turgidum convar. durum Desf. MacKey). We evaluated the genetic variation for delta, the relationship between delta and grain yield, and the magnitude of genotype x year (G x Y) interactions in durum wheat. Field experiments were conducted under Mediterranean conditions on 144 durum wheat accessions during three successive years. Grain yield and carbon isotope discrimination of flag leaves (deltaF) and kernels (deltaK) were measured. Large genotypic and year variation was observed for deltaF and deltaK. Flag leaf delta was correlated with grain yield in 2 yr characterized as having greater water limitation (r = 0.29 - 0.38, P < 0.001). Conversely, deltaK and grain yield were significantly correlated in all 3 yr (r = 0.49 - 0.52, P < 0.001). In addition, G x Y interactions were significant for deltaF, deltaK and grain yield. However, significant correlations (P < 0.001) were noted for deltaK across years. As a result, deltaK may serve as a better predictive criterion for higher grain yield under Mediterranean conditions
Keyword	[ Hide all but 1 of 42 ] accessions addition barley bread bread wheat carbon carbon isotope discrimination correlation crop yield delta discrimination durum durum wheat field field experiment field experimentation flag leaf genetic variation genotype genotype environment interaction grain yield hordeum hordeum vulgare indirect selection kernel kernels languedoc roussillon limitation mediterranean conditions seed selection stability stable isotopes transpiration transpiration efficiency triticum triticum aestivum triticum durum triticum turgidum turgidum water yield

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