Inheritance Of Two Mutants Of Fiber And SSR Analysis Of Lint Gene And Fuzz Gene In Upland Cotton

Cotton is an important cash crop. Its fiber is the most important natural textile material and it plays an important role in national economy of our country and all over the world .So all cotton growing countries pay great attention to the cotton researches on fiber development and inheritance. Usually the Upland cotton seeds are covered with lint and fuzz that result from elongation of the epidermal single cells of the ovule. Fuzzless-linted mutant of Xin (FLM) was a dominant mutant from XinWX. Inheritance of two fiber mutants was studied with 6 F₂ generations and 2 F₂:3 families from crosses XZ142WX × XZ142, XinWX × TM-1, XZ142WX and FLM × XinWX , XZ142WX and n₂ in Upland cotton. The main results are as follows: (1) Genetic analysis revealed that there were two different loci between XinWX and TM-1 in the development of fuzz and lint, and that FLM was a dominant mutant from XinWX and they had only one different locus in the development of lint. (2) Allelic tests indicated that the fuzzless-lintless genes of XinWX were allelic to that of XZ142WX and the fuzzless-linted genes of FLM were allelic to the recessive naked-seed gene n₂ It is more reasonable that inheritance of lint and fuzz may be analyzed by one pair of characters than by two pairs. These two fiber mutants might be looked as isogenic lines and would make notable roles in elucidating inheriting rules and researches on molecular biology of fiber.In this thesis, lint gene was tried to map with (FLM ×XZ142WX) F₂ and fuzz gene with (FLM×XZ142) F₂. No SSRs were linkaged with lint gene and fuzz gene, and the possible reasons were tentatively discussed.