Propagation of Ornamental Plants
13(1): 3-11, 2013
MICRONUTRIENT OPTIMIZATION IN THE BASAL MEDIUM IMPROVES IN VITRO PLANT REGENERATION IN CARNATION (DIANTHUS CARYOPHYLLUS L.) AND CHINESE PINK (DIANTHUS CHINENSIS L.)
Suman Kumawat, Sumita Kachhwaha, and Shanker Lal Kothari*
Department of Botany, University of Rajasthan, Jaipur, 302004, India, *Fax: + 141-2703439, *E-mail: slkothari28@gmail.com
In this study, effect of different inorganic micronutrients (CoCl2, MnSO4, ZnSO4, CuSO4 and H3BO3) on in vitro axillary shoots induction and proliferation in Dianthus caryophyllus L. ‘Fragrance Mix’ and D. chinensis L. ‘Double Flowered Mix’ was investigated. Shoots were induced directly from the cultured nodal segments without formation of intervening callus on MS medium supplemented with 4.40 µM BAP and 2.69 µM NAA and varying concentrations of micronutrients. Highest shoots induction was observed when the concentration of CuSO4 in the medium was 1 µM (10 times higher than the MS level) and 0.5 µM (5 times higher than the MS level) for D. caryophyllus L. ‘Fragrance Mix’ and D. chinensis L. ‘Double Flowered Mix’, respectively. Shoots formed on induction medium were subcultured on medium with the same concentration of nutrients for proliferation. In proliferation medium highest number of axillary shoots 27 and 20 were formed at 1.0 µM CuSO4 for D. caryophyllus ‘Fragrance Mix’ and D. chinensis ‘Double Flowered Mix’ respectively. Highest number of axillary shoots up to 17 was formed on medium with 0.55 µM CoCl2 in D. caryophyllus ‘Fragrance Mix’ and 18 in D. chinensis ‘Double Flowered Mix’ on medium with 0.11 µM CoCl2. A significant improvement in shoots induction and proliferation was observed, when the concentration of B, Zn, and Mn was higher in the medium. Random amplification of polymorphic DNA (RAPD) showed monomorphic bands in all the plants, thereby confirming clonal fidelity of the regenerants.
Key words: axillary shoots, inorganic micronutrients, nodal segment, organogenesis, RAPD.
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