Abstract.
Endogenous levels of cytokinin and abscisic acid (ABA) were determined in ovules of normal cotton (TM-1) and four fiber differentiation mutants (n2, Ligon lintless, H10, and Xu142) before and after flowering by enzyme-linked immunosorbent assays. The fluctuation patterns of ABA levels in ovules of normal cotton and mutants were similar. At the fiber elongation stage, ABA content was low, and from 1 day after flowering, the ABA content decreased steadily. On the other hand, the peaks of isopentenyladenine and isopentenyladenosine in ovules of TM-1 were observed 1 day before flowering. The level of cytokinins decreased after flowering in TM-1, whereas in the mutants it increased steadily. These results indicate that endogenous ABA is probably not the main inhibitor for fiber elongation and that endogenous cytokinins likely play a dual role in fiber development. Before flowering, cytokinins function as one of the stimuli for the initiation of fibers, but after flowering, cytokinins inhibit fiber growth.
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Received February 18, 1997; accepted June 11, 1997
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Chen, JG., Du, XM., Zhou, X. et al. Levels of Cytokinins in the Ovules of Cotton Mutants with Altered Fiber Development. J Plant Growth Regul 16, 181–185 (1997). https://doi.org/10.1007/PL00006994
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DOI: https://doi.org/10.1007/PL00006994