Carbon isotope discrimination and indirect selection for transpiration efficiency at flowering in lentil (Lens culinaris Medikus), spring bread wheat (Triticum aestivum L.) durum wheat (T. turgidum L.), and canola (Brassica napus L.)

Matus, A. and Slinkard, A.E. and van Kessel, C. (1996) Carbon isotope discrimination and indirect selection for transpiration efficiency at flowering in lentil (Lens culinaris Medikus), spring bread wheat (Triticum aestivum L.) durum wheat (T. turgidum L.), and canola (Brassica napus L.). Euphytica, 87 (2). pp. 141-151.

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Abstract

Carbon isotope discrimination (CID) has been proposed to indirectly select for transpiration efficiency in several C3 species. To determine the effectiveness of CID to indirectly select for transpiration efficiency at flowering, the following were measured: (1) variability for CID, (2) the magnitude of the genotype-by-water regime interaction for CID, and (3) the magnitude of the correlation between CID and both transpiration efficiency and dry matter at flowering. Ten lentil (Lens culinaris) genotypes, ten wheat genotypes (eight spring wheat (Triticum aestivum) and two durum wheat (T. turgidum [T. durum])), and ten canola [rape] (Brassica napus) genotypes were grown in a greenhouse at 80, 50 and 30% field capacity. Above ground dry matter was harvested at 80% flowering, and dry matter at flowering, water used and CID determined. Genotype variation for CID was observed in lentil, spring wheat and canola at each water regime, and when averaged over the three water regimes. The largest range in CID among lentil and spring wheat genotypes was observed using the wet regime; whereas, the dry regime provided the largest range for CID in canola genotypes. In all species the genotype-by-water regime interaction for CID was non-significant. The correlation between CID and dry matter at flowering was inconsistent across water regimes and years. In addition, in all three crops, no correlation was observed between CID and transpiration efficiency at any of the water regimes, and when averaged over water regimes and years. These results suggest that under the conditions reported, CID cannot be used effectively to indirectly select for transpiration efficiency in lentil, spring wheat and canola.

Item Type: Article
Additional Information: We thank the Natural Sciences and Engineering Research Council of Canada, the Canadian Wheat Board and the Dollie Hantelman Postgraduate Scholarship for financial support, G.R. Parry, G.D.W. Swerhone, and M. Wong for their excellent technical assistance, and M.A. Matus for her comments on the manuscript.
Uncontrolled Keywords: Carbon isotope discrimination, Crossover interaction, Canola, Brassica napus, Lentil, Lens culinaris, Bread wheat, Triticum aestivum, Durum wheat, Triticum turgidum, Transpiration efficiency
Author Affiliation: Department of Crop Science and Plant Ecology, University of Sasakatchewan,Canada.
Subjects: Plant Production
Plant Physiology and Biochemistry > Biochemistry
Social Sciences > Plant Physiology and Biochemistry > Biochemistry
Divisions: Other Crops
Depositing User: Mr Arbind Seth
Date Deposited: 29 Nov 2012 11:41
Last Modified: 29 Nov 2012 11:41
Official URL: http://dx.doi.org/10.1007/BF00021887
URI: http://eprints.icrisat.ac.in/id/eprint/8863

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