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  1. Vol. 10 No. 4, p. 392-396
     
    Published: July, 1970


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doi:10.2135/cropsci1970.0011183X001000040024x

Agronomic Properties Associated with the Glandless Alleles in Two Varieties of Upland Cotton1

  1. George L. Hosfield,
  2. J. A. Lee and
  3. J. O. Rawlings2

Abstract

Abstract

Experiments conducted at the North Carolina Agricultural Experiment Station showed that, after five generations of backcrossing, glandless strains of upland cotton (Gossypium hirsutum L.) yielded from 5 to 10% less fiber than their glandular recurrent parents. Replicated trials involving normal (dimeric), semi-glandless (monomeric), and glandless lines were performed over a period of 3 years at three locations to test the hypothesis that reductions in performance were associated with the glandless alleles. Two varieties were used, and there were four genotypes. In the ‘Coker 100-A’ varietal background most of the loss in productivity was associated with the g12 allele, whereas the gl2 allele was largely neutral in its effects. Several characters other than fiber yield were affected in some way by the presence of gl2. In the ‘Empire’ background both gl2 and gl3 were associated with yield reduction, and gl2 affected a few other characters. In both varieties gl2 had much more drastic effects than gl3 and affected more characters. Although the experiments were not designed to distinguish between linkage and pleiotropic effects, the pattern of the effects suggested that linked factors were the major cause of the loss in performance.

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