The iaaM gene encodes a monooxygenase, an enzyme that can catalyze the synthesis of IAA from tryptophan and is functional in plants. We cloned the iaaM into the T-DNA region of a Ti binary vector pWM101 under the control of the cotton fiber specific E6 promoter, and the recombinant was transformed into Nicotiana tabacum WS38 via leaf disc infection with Agrobacterium tumefaciencs GV3101 that harbored the Ti plasmid. Some 25 transformed seedlings were screened out, and the trichomes of the transgenic leaves were both denser and lengthier. The E6 promoter-specific expression of iaaM in trichomes led to the more active auxin synthesis in the cells and allowed the transgenic leaves to develop tidier and longer trichomes. As more trichomes developed on the transgenic leaves, the leaf epidermis appeared fuzzier than the wild control. The research showed that iaaM expression in trichomes influenced the development of trichomes both during their initiation and elongation.
Russian Journal of Plant Physiology – Springer Journals
Published: Oct 13, 2013
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