PJB-2020-454
Physio-biochemical analysis of salinity tolerance in sodium contrasting rice (Oryza sativa L.) genotypes
Aisha Shereen, Asma, Mohammad Ubaidullah Shirazi, Mohammad Athar Khan, Mohammad Ali and Mohammad Arif
Abstract
Experiments were carried out in completely randomized design (CRD) at early seedling stage with five contrasting rice genotypes (high and low sodium rice genotypes) including salt tolerant check under different treatments of sodium chloride salinity. Multiple physiological traits were investigated in these sodium contrasting rice genotypes to identify contributory traits in salinity tolerance mechanisms. These studies have revealed variable reduction in growth among genotypes with least reduction in FL-478 (salt tolerant check) followed by IR-6 and IR-72. The genotype GML-498 exhibited highest reduction in fresh weights under salinity. The genotype IR-6 and IR-72 were observed comparatively better in most of the physiological traits studied. Comparatively less sodium (Na) concentrations along with less relative increase were observed in IR-6 and IR-72. Tolerant genotypes maintained less Na in their shoot through balancing Na in their root. On contrary to these, sensitive genotypes accumulated less Na in roots than in their shoots. Study of physiological traits revealed that low sodium accumulating rice genotypes exhibited relatively less electrolyte leakage (EL) and low malondialdehyde (MDA) concentrations, less increase of hydrogen peroxide (H2O2) than high sodium accumulating rice genotypes under salinity. Correlation studies have indicated that trait of sodium was significantly positively correlated with proline, total soluble sugars, MDA & EL. Whereas Na, MDA and EL were found negatively correlated with chlorophyll, while positively correlated with proline and TSS. The traits of chlorophyll, carotenoids and potassium sodium ratios were positively correlated with growth and observed as contributory traits under salinity.
To Cite this article:
Shereen, A., Asma, M.U. Shirazi, M.A. Khan, M. Ali and M. Arif. 2022. Physio-biochemical analysis of salinity tolerance in sodium contrasting rice (Oryza sativa L.) genotypes. Pak. J. Bot., 54(3): DOI: http://dx.doi.org/10.30848/PJB2022-3(15)
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