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Published in Crop Sci 37:1123-1126 (1997)
© 1997 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Interaction of Virescent Genes in Upland Cotton (Gossypium hirsutum L.): Chlorophyll Content

Tian Zhen Zhang, Jia Ju Pan and Song Hua Xiao

Cotton Genetics and Breeding Res. Lab., Nanjing Agric. Univ., Nanjing 210095, P. R. China

R. J. Kohel*

USDA-ARS, Southern Crops Res. Lab., Crop Germplasm Research Unit, 2765 F&B Road, College Station TX 77845

* Corresponding author (rjk0339{at}acs.tamu.edu).

The interactions between the virescent genes v2 and v14 of cotton (Gossypium hirsutum L.) were determined and compared with other virescent genes. Single crosses were made among various virescent lines, and the progenies were tested from 1991 to 1994. Allelic tests established that v2 and v14 were nonallelic, but their F1 hybrid plants were virescent, with phenotypic expression and chlorophyll content intermediate between the parents. In the F2 population, plants segregated into classes with various degrees of virescent expression — from green, parental virescents, deep yellow, to chlorotic types with extremely low vigor. The chlorophyll content of functional leaves on the deep-yellow type (0.54–0.56) was less than one-half that of the parental virescent types (1.13–1.43). The interaction effect between v2 and v14 was prominently reflected in the reduced content of Cb and the high Ca/b ratio of the deep-yellow type. This complementary function can be due to the nondiploidized function of homoeologous loci of the G. hirsutum allotetrapioid.

This research was supported, in part, by the National Natural Science Foundation in China.

Received for publication July 15, 1996.




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