Effect of phytohormones on fiber initiation of cotton ovule

• Autorzy: Zhang H. , Shao M. , Qiao Z. , Yuan S. , Wang X. , Hua S.
• Języki publikacji: EN

Abstrakty

EN

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 (GA₃) 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 GA₃, which implied that fiber initiation could be promoted by them as additive.

• Wydawca: -
• Czasopismo: Acta Physiologiae Plantarum
• Rocznik: 2009
• Tom: 31
• Numer: 5
• Opis fizyczny: p.979-986,fig.,ref.

Twórcy

autor

Zhang H.

• Department of Agronomy, College of Agriculture and Biotechnology, Zhejiang University, 310029 Hangzhou, China
• Institute of Crop Germplasm Resources of Shanxi Academy of Agricultural Sciences, 030031 Taiyuan, China

autor

Shao M.

• Department of Agronomy, College of Agriculture and Biotechnology, Zhejiang University, 310029 Hangzhou, China

autor

Qiao Z.

• Institute of Crop Germplasm Resources of Shanxi Academy of Agricultural Sciences, 030031 Taiyuan, China

autor

Yuan S.

• Department of Agronomy, College of Agriculture and Biotechnology, Zhejiang University, 310029 Hangzhou, China

autor

Wang X.

• Department of Agronomy, College of Agriculture and Biotechnology, Zhejiang University, 310029 Hangzhou, China

autor

Hua S.

• Department of Agronomy, College of Agriculture and Biotechnology, Zhejiang University, 310029 Hangzhou, China

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