Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 26:1119-1123 (1986)
© 1986 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Heterosis in Upland Cotton. I. Growth and Leaf Area Partitioning1

Randy Wells and William R. Meredith, Jr.2

There is relatively little information concerning the physiological alterations that are related to heterosis in cotton Gossypium hirsutum L.). To better understand this phenomenon, growth and partitioning of dry matter in four established upland cotton cultivars and their F1 hybrid progeny were monitored in three environments. Total biomass was greater in hybrids than their parents in all environments. Growth analysis found that heterosis greatly affected early development of the hybrids. Although increases in leaf area were greater in the progeny, they were proportional to the dry weight growth of the plant, resulting in similar leaf area partitioning (LAP) coefficients for both parents and hybrids. The greater leaf area index of the hybrids, resulting from greater net assimilation rates but similar LAP values, further stimulates growth via greater interception of light and associated photosynthate production prior to the advent of significant interplant competition.

Key Words: Gossypium hirsutum L. • Growth analysis • Hybrid • Lint yield • Vegetative biomass

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. 6230 of the Mississippi Agric. and For, Exp. Stn.

2 Plant physiologist and geneticist, respectively.

Received for publication December 9, 1985.


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C. W. Kennedy and R. L. Hutchinson
Cotton Growth and Development under Different Tillage Systems
Crop Sci., July 1, 2001; 41(4): 1162 - 1168.
[Abstract] [Full Text] [PDF]


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