Genotypic variation in transpiration efficiency, carbon-isotope discrimination and carbon allocation during early growth in sunflower [Helianthus annuus]
1990
Virgona, J.M. | Farquhar, G.D. (Australian National Univ., Canberra. Research School of Biological Sciences) | Hubick, K.T. | Rawson, H.M. | Downes, R.W. (Commonwealth Scientific and Industrial Research Organisation, Canberra (Australia). Div. of Plant Industry)
For 6 genotypes grown in a glasshouse, there was significant genotypic variation in dry matter production (W) and this was closely reflected in carbon isotope discrimination (delta) for 2 watering treatments. A low watering regime caused a decrease in delta but no change in W; nonetheless the genotypic ranking for either delta or W was not significantly altered by water stress. A positive correlation between W and biomass accumulation occurred among genotypes of well-watered plants. L, the ratio of total plant carbon content to leaf area, was positively correlated with W and negatively correlated with delta. Delta can be used to select for W among young vegetative sunflower plants. However, selection for W may be accompanied by changes in other important plant growth characteristics such as L.
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