Abstract
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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Abbreviations
- CaMV35S:
-
Cauliflower mosaic virus 35S promoter
- CKX:
-
Cytokinin dehydrogenase
- dpa:
-
Day(s) post anthesis
- EST:
-
Expressed sequence tag
- FAD:
-
Flavin adenine dinucleotide
- GA:
-
Gibberellin
- BR:
-
Brassinosteriod
- GUS:
-
β-glucuronidase
- IAA:
-
Indole-3-acetic acid
- Km:
-
Kanamycin
- Cef:
-
Cefotaxime
- As:
-
Acetosyringone
- 6-BA:
-
6-benzylaminopurine
- NAA:
-
1-Naphthaleneacetic acid
- IBA:
-
Indole-3-butyric acid
- RT-PCR:
-
Real-time PCR
- Z:
-
Trans-Zeatin
- ZR:
-
Trans-Zeatin riboside
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Acknowledgments
This work was supported by The Major State Basic Research Development Program of China (grant No 2010CB126000 to Y.P) and the National Natural Sciences Foundation of China (grant No. 30530490 to Y.P.).
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Zeng, Qw., Qin, S., Song, Sq. et al. Molecular Cloning and Characterization of a Cytokinin Dehydrogenase Gene from Upland Cotton (Gossypium hirsutum L.). Plant Mol Biol Rep 30, 1–9 (2012). https://doi.org/10.1007/s11105-011-0308-3
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DOI: https://doi.org/10.1007/s11105-011-0308-3