The Commelina Yellow Mottle Virus promoter is a strong promoter in vascular tissue of transgenic Gossypium hirsutum plants
文献类型: 外文期刊
第一作者: Yuan, ZQ
作者: Yuan, ZQ;Wu, JH;Wu, B;Li, YE;Chen, ZX;Li, SJ;Tian, YC
作者机构:
关键词: transgenic cotton plant;Commelina Yellow Mottle Virus (CoYMV) promoter;vascular tissue;GUS
期刊名称:ACTA BOTANICA SINICA ( 影响因子:0.599; )
ISSN: 0577-7496
年卷期: 2000 年 42 卷 11 期
页码:
收录情况: SCI
摘要: Explants of cotton ( Gossypium hirsutum L. cv. Jingmian 7) were transformed with Agrobacterium tumefaciens (Smith et Townsend) Conn LBA4404 harboring an expression cassette composed of CoYMV ( Commelina Yellow Mottle Virus) promoter-gus-nos terminator on the plant expression vector pBcopd2. Transgenic plants were regenerated and selected on a medium containing kanamycin. GUS (beta -glucuronidase) activity assays and Southern blot analysis confirmed that the chimerical gus gene was integrated into and expressed in the regenerated cotton plants. Plant expression vector pBI121 was also transferred into the same cotton variety and the regenerated transgenic plants were used as a positive control in GUS activity analysis, Evidences from histochemical analysis of GUS activity demonstrated that under the control of a 597 Lp CoYMV promoter the gus gene was highly expressed in the vascular tissues of leaves, petioles, stems, roots, hypocotyls, bracteal leaves and most of the flower parts while GUS activity could not be detected in stigma, anther sac and developing cotton fibers of the transgenic cotton plants. GUS specific activity in various organs and tissues from transgenic cotton lines was determined and the results indicated that the CoYMV promoter-gus activities were at the same level or higher than that of CaMV 35S promoter-gus in leaf veins and roots where the vascular tissues occupy a relatively larger part of the organs, but in other organs like leaves, cotyledons and hypocotyls where the vascular tissues occupy a smaller part of the organs the CoYMV promoter-gus activity was only 1/3 - 1/5 of the CaMV 35S promoter-gus activity. The GUS activity ratio between veins and leaves was averaged 0.5 for 35S-GUS plants and about 2.0 for CoYMV promoter-gus transgenic plants. These results further demonstrated the vascular specific property of the promoter in transgenic cotton plants, An increasing trend of GUS activity in leaf vascular tissues of transgenic cotton plants developing from young to older was observed.
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