Characterization of Photosynthesis in Cold Hardening Winter Wheat
1970
Barta, A. L. | Hodges, H. F.
Photosynthesis (net CO₂ assimilation) was measured on two winter and one spring wheat cultivars (Triticum aestivum) at three stages of cold hardening. Photosynthesis during hardening was characterized by decreasing rates of CO₂ assimilation and reduced response to light and temperature changes. The winter wheats, ‘Vermillion’ and ‘Seneca,’ had higher rates of photosynthesis at all stages of hardening than did the spring wheat, ‘Justin.’ Vermillion, the most winter hardy cultivar, had significantly higher photosynthesis than Seneca when rates were averaged over all variables. Treatment of the plants with (2-chloroethyl) trimethylammonium chloride did not produce any significant changes in any of the photosynthetic parameters studied. No significant differences in specific rates of photophosphorylation or Hill reaction were noted among the cultivars, in contrast to the varietal differences found in whole plant CO₂ assimilation rates.
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