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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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