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Effect of Cytoplasmic Male Sterility on Accumulation and Translocation of ¹⁴C-labelled Assimilates in Corn¹

A male-sterile corn (Zea mays L.) hybrid and its fertile counterpart were grown under field conditions for 3 years. In each year one upper leaf of plants of both types was allowed to assimilate ¹⁴CO₂ in photosynthesis at both tassel emergence and silking. The plants were harvested after either 1 or 8 days, and distribution patterns of ¹⁴C were measured. Less upper leaf assimilates were distributed to male-sterile tassels than to fertile tassels. More of the labelled assimilates accumulated in developing ears and husks of male-sterile plants. Increased tolerance in male-sterile corn lines to stresses caused by high plant populations and other environmental factors appears to occur at least partly because of reduced intraplant competition for assimilates by tassels during early ear development.

Key Words: Distribution of photosynthetic products • Population tolerance • Intraplant competition

² Research Scientist, Associate Professor, and Professor, respectively.

Received for publication August 24, 1973.

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