ISSN:
1399-3054
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Biology
Notes:
The effects of NaCl on endogenous free levels of the poluamines putrescine, spermi dine and spermine, and the relationships between polyamines, K+ levels and Na+ accumulation were determined in leaves of the cultivated tomato (Lycopersicon esculentum Mill.) and its wild, salt-tolerant relative L. pennellii (Correll) D' Arcy at different exposure times during a 32-day period. Both stress treatments (100 and 200 mM NaCl) decreased the levels of putrescine and spermidine, although to a different degree for the cultivated and wild tomato species. The spermine levels did not decrease with salinity in L. pennellii over the salinization period, whereas they decreased in L. esculentum, except at the first application of the 100mM NaCl treatment. In both species, the changes induced by salinity in total polyamines and K+ were very similar, with the accumulation of Na+ in the leaf being concomitant with a decrease in both total polyamines and K+. This suggests that the main role of the polyamines in the leaf tissues. In this sense, a direct relationship between total polyamines and K+, and inverse relationship between polyamines and Na+ and between K+ and Na+ were found for both species. In the short term (up to 4 days) a peculiar physiological behavior was found in L. pennellii, as the total polyamine and K+ levels decreased at 100 mM but not at 200 mM NaCl, while after this time the latter plants had values lower than those of the 100 mM NaCl-treated plants at day 11.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1399-3054.1997.tb01006.x
