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Published in Crop Sci 25:348-350 (1985)
© 1985 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Effect of Exotic Cytoplasms on Seed Quality of Cotton1

F. M. Bourland and Joel F. Mahill2

We evaluated seed weight, germination, and resistance to aging of eight cotton (Gossypium hirsutum L.) genotypes having cytoplasms of seven Gossypium species. After seed of the 56 populations were exposed to accelerated aging, standard germination tests were conducted on nonaged and aged seed. Resistance to aging was defined as the ratio of germination of aged seed to germination of nonaged seed, expressed as a percentage. Exotic cytoplasms were associated with increased seed weight when compared to the original G. hirsutum cytoplasm. Germination of nonaged seed averaged over G. hirsutum genotypes was not significantly affected by cytoplasms. Each exotic cytoplasm, except G. longicalyx Hutchinson and Lee and G. barbadense L., caused a decrease in resistance to aging. A significant nuclear genotype by cytoplasm interaction indicated that the tendency toward less resistance could be mitigated in specific nuclear genotype-cytoplasm combinations.

Key Words: Cotton • Germplasm • Interspecific breeding • Genetic diversity

1 Joint contribution from the Dep. of Agronomy and from the Crop Science Res. Lab., USDA-ARS. Journal Article no. 5567 of the Mississippi Agric. and For. Exp. Stn.

2 Associate agronomist, Dep. of Agronomy, P. O. Box 5248, Mississippi State, MS 39762 and agricultural research technician, Crop Science Res. Lab., P. O. Box 5367, Mississippi State, MS 39762, respectively.

Received for publication August 8, 1983.




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