Abstract

KHALEKUZZAMAN, Mohammad et al. Micropropagation of an elite F1 watermelon (Citrullus lanatus) hybrid from the shoot tip of field grown plants. Braz. arch. biol. technol. [online]. 2012, vol.55, n.3, pp. 335-340. ISSN 1516-8913.  http://dx.doi.org/10.1590/S1516-89132012000300002.

The aim of this work was to develop a protocol for rapid micropropagation of an elite F1 hybrid watermelon cultivar using shoot tip of field-grown plants. Maximum frequency (73%) of shoot tip showed growth response in MS medium supplemented with 5 mg l^-1 benzyl adenine (BA) and 0.1 mg l^-1 indole-3 acetic acid (IAA). Upon transfer to cytokinin-enriched medium, the cultures produced multiple shoots and 2.0 mg l^-1 BA was optimum in this respect. Addition of gibberellic acid (GA₃) in the multiplication medium resulted in better growth of shoots. Rooting rate was 100% when shoots were obtained from second subculture were cultured in medium with 1.0 mg l^-1 indole-3 butyric acid (IBA). The shoots produced more roots with increasing number of subcultures. About 72% of the regenerated plantlets acclimatized successfully and survived in the soil condition.

Keywords : In vitro; watermelon; micropropagation; hybrid vigor.