"SCREENING OF SOME UPLAND RICE CULTIVARS FOR SALT TOLERANCE"
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Date
1994
Authors
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Mahatma Phule Krishi Vidyapeeth, Rahuri.
Abstract
Six cultivars of rice (Oryza satlva L.) were exposed
to increasing concentration of salt stress for eight days
to study its effects on some biochemical and physiological
parameters, viz.germination percentage, shoot and root growth,
soluble proteins, free amino acids, proline, reducing, non
reducing and total sugars, ascorbic acid and activities of
c£ -amylase and phosphatase. The content of soluble proteins,
reducing and total sugars, ascorbic acid and the activi- ,
ties of •©G-amylase and phosphatase of six cultivars of rice
decreased with increasing level of salinity. However, the
decrease in the activity ofoC-amylase and phosphatase was
higher in salt susceptible rice cvs.(RTN-1, RTN-24 and K-184)
than in salt tolerant ones (PN-1, PN-2 and I.R.-8). Also the
content of free amino acids of all the six rice cvs. decreased with increasing salinity, but in salt tolerant rice cvs.
it was higher at 0.1M NaCl level. The proline content
increased with increasing salinity upto 0.10M NaCl in
salt susceptible rice cvs. and upto 0.15M NaCl in salt
tolerant rice cvs.
The differential potential of proline accumulation,
content of free amino acids and activities of °C-amylase
and phosphatase could be regarded as the biochemical
markers to indicate levels of salt tolerance in rice
cultivars. Based on the physiological and biochemical
parameters studied, rice cvs. viz. PN-1, PN-2 and I.R.-8
could be classified as salt tolerant, whereas the other
three rice cvs. viz. RTN-1, RTN-24 and K-184, appeared
to be comparatively salt susceptible.
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