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Upland and Pima Cotton as Pollen Donors for Male-Sterile Upland Seed Parents

USDA-ARS, Carl Hayden Bee Res. Ctr., Tucson, AZ 85719
Dep. of Plant Sci., Univ. of Arizona, Tucson, AZ 85721

^* Corresponding author.

The development of an interspecific hybrid cotton has been hampered by a serious problem with pollination. A field study was conducted to compare Pima cotton (Gossypium barbadense L.) with upland cotton (G. hirsutum L.) as a pollen source for hybrid seed production using male-sterile upland seed parents. Male-sterile cotton flowers were hand pollinated with either upland or Pima cotton pollen. The number of pollen grains per stigma and the resulting number of seeds per boll were evaluated using covariance analysis. In each of 3 yr the bolls produced from pollen of upland cotton produced more seeds per boll than did those produced from Pima pollen. Adjusted least square means indicate an advantage of four to seven seeds per boll with upland pollen. The conclusion is that more pollen grains per stigma are needed to set an equal number of seeds when using Pima pollen compared with using upland pollen.

Received for publication December 15, 1989.