Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 27:47-48 (1987)
© 1987 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Sub Okra Leaf Influence on Cotton Yield1

William R. Meredith, Jr. and Randy Wells2

A study in three diverse environments in 1985 near Stoneville, MS compared the yield of eight BC4F3-derived sub okra leaf (Lu2) and normal leaf (I2) cotton plants (Gossypium hirsutum L.). Sub okra leaf cotton averaged significantly higher yields (3%) than normal leaf cotton. Also, a significant (P = 0.03) leaf type x cultivar background interaction was detected. For the cultivar backgrounds of ‘Stoneville 825’, ‘Deltapine 26’, ‘Deltapine 5540’, DES 2–10, and ‘Tamcot CAMD-E’, the average yield of sub okra and normal-derived populations was 968 and 971 kg/ha, respectively. For the backgrounds of ‘DES 422’, ‘SC-’, and MD 65-11 the average yield was 972 and 894 kg/ha, respectively. No major differences between sub okra and normal leaf populations for earliness, yield components, or fiber properties were detected. The results from these backcross-derived populations indicate that previous evaluation studies using F3 hybrid populations that were genetically similar except for one simple inherited trait, leaf type, were an acceptable method for measuring approximate yield potential of the new trait. This study indicates that for some genetic backgrounds and environments that the use of sub okra to replace normal leaf offers a potential yield increase of 3 to 5%.

Key Words: Near-isogenic lines • Gossypium hirsutum L. • Leaf canopy • Okra leaf • Super okra leaf • Canopy photosynthesis

1 Contribution from USDA-ARS, Cotton Physiology and Genetics Research Unit, Stoneville MS 38776 in cooperation with the Mississippi Agric. and For. Exp. Stn. Published as Journal Paper no. 6384 of the Mississippi Agric. and For. Exp. Stn.

2 Research geneticist and plant physiologist, respectively, USDA-ARS, Cotton Physiology and Genetics Research Unit, Jamie Whirten Delta States Research Center, Stoneville, MS 38776.

Received for publication May 6, 1986.




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Copyright © 1987 by the Crop Science Society of America.