期刊
PLANT MOLECULAR BIOLOGY REPORTER
卷 30, 期 1, 页码 1-9出版社
SPRINGER
DOI: 10.1007/s11105-011-0308-3
关键词
Cotton; Cytokinin dehydrogenase; Cytokinins; Fiber cell initiation
资金
- Major State Basic Research Development Program of China [2010CB126000]
- National Natural Sciences Foundation of China [30530490]
Cytokinins are plant hormones that play crucial roles in plant growth and development. Cytokinin dehydrogenase (CKX), regarded as a main negative regulator in cytokinin metabolism in plants, irreversibly degrades cytokinins into adenine/adenosine moiety. A CKX homologous gene, designated GhCKX, was cloned from upland cotton (Gossypium hirsutum L.). Transgenic tobacco plants over-expressing GhCKX showed a typical cytokinin-deficient phenotype, while CKX-silenced tobacco plants exhibited cytokinin over-producing phenotype. Tissue specifically enhancing the expression of GhCKX in the ovule epidermis of transgenic cotton led to a significant decrease of trans-zeatin and trans-zeatin riboside contents in the ovule. The decline of cytokinins resulted in a significant decrease in fiber initials on a single ovule. Our results indicate that GhCKX encodes a functional CKX, and cytokinins may be required for the initiation of cotton fiber cells.
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