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Seedling Photosynthetic Efficiency of a Grain Sorghum Hybrid and Its Parents¹

Seedlings of a hybrid and its parents of Sorghum bicolor (L.) Moench were examined from emergence through the four leaf stage for photosynthetic efficiency. Seedling root components were included in the analysis. Significant heterosis occurred for leaf area, total dry weight, and for rate of development, but significant heterosis was not exhibited for root/shoot ratios, net assimilation rate (NAR), or total dry matter/leaf area ratios. These results indicate that heterosis is not present for photosynthetic efficiency as measured by NAR in these hybrid sorghum seedlings.

Key Words: Net assimilation rate • Growth analysis • Root-shoot ratio • Hybrid vigor • Heterosis • Sorghum bicolor (L.) Moench

² Associate professor, agricultural engineering, TAES; and research associate, TAES, P. O. B. 748, Temple, TX 76501, respectively.

Received for publication March 10, 1978.