Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 9:483-486 (1969)
© 1969 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Varietal Differences in Net Photosynthesis of Zea mays L.1

Gary H. Heichel and Robert B. Musgrave2

The photosynthesis of single, attached leaves was measured in the Held in a well-ventilated, brightly illuminated chamber by infrared gas analysis. Differences in mean photosynthesis rates of 100 to 200% were observed among inbred, hybrid, and open-pollinated varieties grown in temperate and tropical climates. Photosynthetic heterosis was apparent in single crosses derived from inbreds of divergent ancestry. Marked variability in photosynthesis among plants of several varieties was observed. Photosynthetic rates were correlated with fresh weight of leaf lamina and days between emergence and silking, but not with dry weight of leaf lamina, or with water content or soluble solids of leaf.

Key Words: Leaf chamber • Heterosis • Genetic variability

1 Contribution from the Department of Agronomy, New York State College of Agriculture, Cornell University, Ithaca, 14850. Agronomy Department Series Paper 838. This research was financed in part by National Science Foundation Grant GB6290 and by Ford Foundation support to the University of the Philippines - Cornell University Graduate Education Program. From material submitted by the senior author in partial fulfillment of the requirements for the Ph.D. degree.

2 Former Graduate Student (now Assistant Crop Physiologist, The Connecticut Agricultural Experiment Station, New Haven, Conn. 06504) and Professor at Cornell University.

Received for publication January 22, 1969.




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