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SALINITY INDUCED
METABOLIC CHANGES IN RICE (ORYZA SATIVA L.) SEEDS DURING
GERMINATION
A. SHEREEN, R. ANSARI, S. RAZA, S. MUMTAZ, M.A. KHAN AND M. ALI KHAN
Abstract: Six inbred lines of rice exhibiting differential tolerance to
salinity were exposed to 0, 50, 75, 100 and 200mM NaCl for 24, 48, 72
and 96 h. The salinity induced metabolic changes (solute leakage, K
efflux and a-amylase
activity) were studied during germination. Germination of rice seeds was
not affected by NaCl concentration less than 100mM. At higher salinity
levels (100 & 200mM NaCl), a delay of 3-6 days in germination was
observed. In the present study, comparatively higher values of solute
leakage were observed in those lines in which germination was
comparatively affected more adversely (sensitive). Sodium chloride
reduced a-amylase
activity in germinating rice seeds to varying degree even at low NaCl
concentrations (50 & 75mM), where germination was not affected greatly.
The tolerant lines exhibited higher enzymatic activity than the
sensitive ones.
Nuclear Institute of Agriculture, Tandojam, Sindh, Pakistan
Email:
aisha.shereen@yahoo.com
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