Effect of phytohormones on fiber initiation of cotton ovule

文献类型： 外文期刊

第一作者： Zhang, Haiping

作者： Zhang, Haiping;Shao, Mingyan;Yuan, Shuna;Wang, Xuede;Hua, Shuijin;Zhang, Haiping;Qiao, Zhijun

作者机构：

关键词： Cotton;Fiber initiation;Endogenous phytohormone;Enzyme

期刊名称：ACTA PHYSIOLOGIAE PLANTARUM （ 影响因子：2.354； 五年影响因子：2.711 ）

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收录情况： SCI

摘要： In order to study the effect of phytohormones on cotton fiber initiation, contents of four endogenous phytohormones and activities of four related enzymes in ovules (in vivo) of a fuzzless-lintless mutant (fl) and its wild-type (FL) line were measured from 4 days before anthesis (day -4) to 4 days after anthesis (day 4). The results showed that contents of indole-3-acetic acid, gibberellic acid (GA), and zeatin riboside in fl ovules were lower than those in FL ovules. Therefore, indole-3-acetic acid, GA, and zeatin riboside were thought to be the promoters of fiber initiation. Although abscisic acid (ABA) content in fl ovule was slightly higher than that in FL ovule on day 0, which might imply that ABA inhibited fiber initiation. Fiber initiation could also be influenced by enzyme through regulating synthesis and degradation of related phytohormones since fl ovules were significantly higher in activities of indole-3-acetic acid oxidase, cytokinin oxidase and peroxidase, but lower in activity of tryptophan synthetase than those in FL ovules. To test the above hypothesis, exogenous plant growth regulators were also applied for the culture of ovules from fl and FL in vitro. When no regulators were added, no fiber was induced on fl ovule, but a few fibers were induced in FL ovule. Higher total fiber units (TFU) were observed when indole-3-acetic acid and gibberellic acid (GA) were applied either separately or in combination to media. TFU did not increased with zeatin riboside alone, but the highest TFU was achieved when zeatin riboside was applied together with indole-3 acetic acid and GA, which implied that fiber initiation could be promoted by them as additive.

分类号： Q94

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