HIGH-FREQUENCY CALLUS INDUCTION AND PLANT REGENERATION IN TRIPSACUM DACTYLOIDES (L.)

A protocol for high-frequency callus, somatic embryogenesis, and plant regeneration for Tripsacum is described. Plants were regenerated from complete shoot meristems (3—4 mm) via organogenesis and embryogenesis. In organogenesis, the shoot meristems were cultured directly on a high cytokinin medium...

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Published in:In vitro cellular & developmental biology. Plant 2002-09, Vol.38 (5), p.435-440
Main Authors: SAIRAM, R. V., WILBER, C., FRANKLIN, J., SMITH, B., BAZIL, J., HASSEL, R., WHALING, D., FRUTIGER, K., BLAKEY, C. A., VIERLING, R., GOLDMAN, S. L.
Format: Article
Language:English
Subjects:
Agrobacterium
Agronomy. Soil science and plant productions
Auxins
Biological and medical sciences
Callus
Economic plant physiology
Embryos
Fundamental and applied biological sciences. Psychology
Immatures
In vitro culture
Organogenesis
Plant physiology and development
Plants
Regeneration
Shoot meristems
Somatic embryogenesis
Tissue cultures, protoplasts
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Summary:A protocol for high-frequency callus, somatic embryogenesis, and plant regeneration for Tripsacum is described. Plants were regenerated from complete shoot meristems (3—4 mm) via organogenesis and embryogenesis. In organogenesis, the shoot meristems were cultured directly on a high cytokinin medium comprising 5—10 mg l-1 (22.2—44.4 μM) 6-benzyladenine (BA). The number of multiple shoots varied from six to eight from each meristem. The time required for production of plants from organogenesis was rapid (4—6 wk). In contrast, callus was induced on an auxin medium and continuously cultured on an auxin medium for production of somatic embryos. Prolific callus with numerous somatic embryos developed within 3—4 wk when cultured on an auxin medium containing 5 mg l-1 (22.6 μM) 2,4-dichlorophenoxyacetic acid (2,4-D). The number of shoots induced varied from two to five per callus. Regardless of the cultivars used, the frequency of callus induction and plant regeneration was between 48% and 94%. The seed germination procedures also were modified and resulted in a maximum of 60—80% seed germination. Finally, the rate of T-DNA transfer to complete shoot meristems of Tripsacum was high on the auxin medium and was independent of whether super-virulent strains of Agrobacterium were used or not.
ISSN:1054-5476
1475-2689
DOI:10.1079/IVP2002314