alexa Stimulatory effect of water stress on plant regeneration in aromatic Indica rice varieties.
Agri and Aquaculture

Agri and Aquaculture

Rice Research: Open Access

Author(s): Jain RK, Jain S, Wu R, Jain RK, Jain S, Wu R, Jain RK, Jain S, Wu R, Jain RK, Jain S, Wu R

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Abstract Frequency of regeneration of fertile plants from cell suspensions was significantly increased using water stress treatments in two commercially cultivated Indian aromatic rice varieties, Basmati 385 and Pusa Basmati 1. The water stress treatments included the use of 1.0\% (w/v) agarose instead of 0.5\% (w/v) for medium solidification, inclusion of mannitol (0.1, 0.2 and 0.4 M) in regeneration medium, or 24 h partial desiccation of calli. When the agarose concentration of the regeneration medium was increased from 0.5\% to 1.0\% (w/v), the frequency of shoot formation in Pusa Basmati 1 from cell suspension-derived calli increased by over eightfold, to 86\%. Mannitol, at 0.1 to 0.2 M concentration, stimulated the frequency of shoot regeneration in Pusa Basmati 1 by fivefold but had no effect in Basmati 385. Mannitol at 0.4 M concentration completely inhibited shoot regeneration but promoted embryogenesis. These calli regenerated shoots with greater frequencies when transferred to mannitol-free medium. Partial desiccation of rice calli resulted in an up to threefold increase in the shoot regeneration frequency. Best regeneration frequencies (54-98\%) were obtained when 24 hdesiccated calli were grown on regeneration medium with 1.0\% (w/v) agarose. A similar stimulatory effect of water stress on plant regeneration was observed in another Indica rice variety, IR43, and a Japonica rice variety, Taipei 309. This article was published in Plant Cell Rep and referenced in Rice Research: Open Access

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