Levels of endogenous polyamines and NaCl-inhibited growth of rice seedlings
1995
Lin, C.C. | Kao, C.H.
The role of endogenous polyamines in the control of NaCl-inhibited growth of rice seedlings was investigated. Putrescine, spermidine and spermine were all present in shoots and roots of rice seedlings. NaCl treatment did not affect spermine levels in shoots and roots. Spermidine levels in shoots and roots were increased with increasing concentrations of applied NaCl. NaCl at a concentration of 50 mM, which caused only slight growth inhibition, drastically lowered the level of putrescine in shoots and roots. Addition of precursors of putrescine biosynthesis (L-arginine and L-ornithine) resulted in an increase in putrescine levels in NaCl-treated shoots and roots, but did not allow recovery of the growth inhibition of rice seedlings induced by NaCl. Pretreatment of rice seeds with putrescine caused an increase in putrescine level in shoots, but could not alleviate the inhibition effect of NaCl on seedling growth. The current results suggest that endogenous polyamines may not play a significant role in the control of NaCl-inhibited growth of rice seedlings.
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