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Changes in Efficiencies and Numbers of Chloroplasts Associated with Divergent Selection for Juvenile Productivity in Zea Mays (L.)¹

Selections of maize (Zea mays L.) which differed in vegetative productivity also differed in photosynthetic efficiencies. The nature of the associated response was evaluated. Selections for high productivity had similar chloroplast diameters but larger guard and epidermal cells than selections for low productivity. The high selections had 90% the DNA per cm2 leaf area but 110% the DNA per leaves 4 to 6 of the low selections. They had similar mg chlorophyll per mg DNA, lower net photosynthetic rate per unit area, but higher net photosynthetic rate per mg chlorophyll than the counter low selections. The high heritability (57%) for leaf width was noted. One should be able to modify photosynthetic potential by selecting for leaf width and, thus, for chlorophyll production.

Key Words: Corn • DNA per leaf • Chlorophyll per leaf • Photosynthetic efficiency

² Professor of Genetics, Department of Genetics, North Carolina State University, Raleigh, N. C. 27607.

Received for publication November 18, 1972.