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Screening for cross tolerance against related osmotic stress in adapted calli of salt sensitive and tolerant varieties of rice

Screening for cross tolerance against related osmotic stress in adapted calli of salt sensitive and tolerant varieties of rice

Phytomorphology 46(4): 357-364

Callus from two varieties of Oryza sativa L. (Basmati 370, sensitive to salinity and SR 26B, tolerant to salinity), adapted to NaCl (128mM and 171mM) and mannitol (247mM and 329mM) were isolated. Being an ionic osmoticum, NaCl caused more injury to Basmati callus than non-ionic osmoticum, mannitol. Such an injurious effect was less in calli of SR 26B. Callus of Basmati 370 adapted to 128mM NaCl showed cross tolerance to iso-osmotic (247mM) and higher (329mM) concentrations of mannitol because the callus grew efficiently on mannitol-containing media with enhanced tissue viability and more accumulation of free proline. However, reverse was not true as the mannitol-adapted calli of Basmati 370 did not grow well on NaCl-containing medium. Calli of SR 26B were equally efficient to cross tolerate mannitol stress, as was evident from almost steady growth and high endogenous proline content.

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Accession: 002951684

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