Submitted to: Acta Gossypii Sinica
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 11/2/1998
Publication Date: N/A
Citation: Interpretive Summary: Effects of normal and lintless-mutant cotton lines were tested with hormones to determine which hormones could induce fiber growth in the mutant. Excised mutant ovules grown in Beasley-Ting media with gibberellic acid initiated fibers. Endogenous analysis of developing bolls showed that the mutant had increased levels of a hormone (isopentenyladenosine) during the period of normal fiber initiation.
Technical Abstract: The effects of plant growth substances on fiber development in upland cotton were studied in this paper by contrasting the induction of cotton fiber in vitro and the fluctuation of the endogenous phytohormones IAA, GA3, iPA, and ABA during fiber initiation of a fuzzless-lintless mutant (FL) with those of its wild-type commercial cultivar Xuzhou 142(WT). Unfertilized and fertilized ovules of both WT and mutant can be initiated to produce fiber in BT with GA3 added. Ovules aged -3 days and -2 days were cultured in vitro until the equivalent of 0 day when fiber development was initiated. This result is completely in accordance with the in vivo situation. The remarkably raised IAA level at anthesis may be responsible for the epidermal cell expansion. The increased levels of iPA in ovules from 4 days preanthesis to 4 days postathesis suppress fiber initiation of FL.