Salinity results in polyamine accumulation in early rice (Oryza sativa L.) seedlings
1988
Basu, R. | Maitra, N. | Ghosh, B. (Bose Inst., Calcutta (India). Dept. of Botany)
Sodium chloride stress in germinated seedlings of rice cv. Rupsail causes an increase in polyamine content and concomitantly an enhancement of arginine decarboxylase (ADC) activity; in the case of putrescine, the increase is 100 percent. The responsiveness of coleoptiles and roots is different; ADC activity is maximum in roots and coleoptiles at 50 mM and 100 mM respectively. Difluoromethyl arginine, a potent inhibitor of ADC, reduces both polyamine accumulation and ADC activity. NaCl can enhance the activity of ADC by 1.6-fold in vitro. Efflux of sugar, amino acid, polyamines and total electrolytes increased gradually with the increase in concentration of salt. Influx of Na+ amd Cl- and efflux of K+ in coleoptiles and roots are directly proportional to the concentration of NaCl applied.
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