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Published in Crop Sci 19:620-622 (1979)
© 1979 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Arrangement of Sympodia and Earliness Potential of Cotton1

L. N. Namken, M. D. Heilman and R. H. Dilday2

Field studies were conducted in 1975 and 1976 to determine if short vertical flowering intervals (VFI) of cotton (Gossypium hirsutum L.) are associated with the arrangement of sympodia. In a random population of ‘Tamcot SP-37’, 24% of the plants had one or more side-by-side (S-S) sympodia with no discernable internode, 27% had one or more close (C) internodes, and 49% had all normal (N) internodes. Ninety-four and 81% of the S-S and C internode-type plants, respectively, had a 0- or 1-day VFI. At 97 days from planting, the average boll load of the plants with at least one S-S or C internode-type was 47 and 33% greater, respectively, than plants with all N internodes. At 124 days from planting, there were no significant differences in average boll load; however, the S-S and C internode-type plants had more than twice as many open bolls as did N plants. In 1976, we compared a Tamcot SP-37 population that had 100% of the plants with at least one S-S or C type internode (obtained by selective thinning at the five and six true leaf stage) with a randomp opulation (randomly thinned), and we verified the earliness potential demonstrated by the individual plant studies in 1~75.

Key Words: Vertical flowering interval • Internode • Rapid fruiting • Fruiting branch • Selection • Gossypium hirsutum L.

1 Contribution from SEA-USDA, Weslaco and Brownsville, Tex.

2 Soil scientists, SEA-USDA, Weslaco, TX7 8596 and research geneticist, SEA-USDA, Brownsville, TX 78520.

Received for publication April 20, 1979.




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