Padma, Nambisan; Renuka, Devi P S; Sabu, A; Sheeja, T E(2013)
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Abstract:
The morphological and biochemical response of calli and seedlings of different
rice cultivars were compared under acid saline conditions. Calli of
both tolerant and sensitive varieties showed severe stress symptoms like
browning and necrosis, but the onset of stress symptoms was delayed in
Pokkali. Seedlings of Pokkali showed minimal stress symptoms in lower
salinities, and curling and senescence of older leaves in higher salinities
although plants revived on amelioration of stress. Seedlings of the other
varieties showed severe stress symptoms even at low salinities and plant
death at higher salinities. Salt stress induced accumulation of the putative
osmoprotectant proline in calli and seedlings of all varieties. Proline accumulation
was higher in sensitive varieties than in Pokkali. These results
indicate that proline accumulation is not directly correlated with salt
tolerance in rice.