Interaction of Virescent Genes in Upland Cotton (Gossypium hirsutum L.): Chlorophyll Content
1997
Zhang, Tian Zhen | Pan, Jia Ju | Xiao, Song Hua | Kohel, R. J.
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.
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