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DOI: 10.1055/s-2006-924346
Georg Thieme Verlag Stuttgart KG · New York
Designing and Transgenic Expression of Melanin Gene in Tobacco Trichome and Cotton Fiber
Publication History
Received: March 7, 2006
Accepted: May 29, 2006
Publication Date:
28 September 2006 (online)
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Abstract
In Streptomyces antibioticus, there are two genes TyrA and ORF438 required for the melanin biogenesis. To investigate whether expression of these two genes in cotton can change cotton fiber colour, we modified the TyrA and ORF438 genes to make their codon usage closer to the codon preference of cotton fiber genes. The resulting versions of these two genes were referred to as dtyrA and dORF438, respectively. Vacuolar targeting signals were also added to their ends. Under the cotton fiber specific Ltp3 promoter, dORF438 and dtyrA were first transformed into model plant tobacco (Nicotiana tabacum). Molecular analyses showed that both the dORF438 and dtyrA genes were successfully expressed in transgenic plants, and the melanin deposition was observed in the trichomes of transgenic tobacco. Excitedly, when the same dORF438 and dtyrA expression cassettes were transformed into cotton (Gossypium hirsutum L.) by pollen tube pathway, the colour of cotton fiber changed from white to brown. Molecular analyses confirmed that both genes were transformed into cotton and expressed successfully. All these results indicate that the synthesized dOFR438 and dtyrA genes can work well in tobacco and cotton. Our study may provide a potential method for modifying the colour of cotton fiber.
Key words
Melanin - dORF438 - dtyrA - transgenic tobacco - trichome - cotton fiber.
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J. Yu
State Key Laboratory for Agrobiotechnology
College of Biological Sciences
China Agricultural University
Yuanmingyuan West Road No. 2
Haidian District, Beijing 100094
PR China
Email: yujj@cau.edu.cn
Editor: M. Koornneef