Author(s):

Nguyen Viet Thanh and Bhagawan Bharali

Abstract: In Agriculture, among the abiotic factors, salinity damages more than 45 million hectares of irrigated land, and 1.5 million hectares becomes unfit for cultivation due to high salinity worldwide. Physiological aberrations are caused by high salinity which are yield limiting in crops. To assess the differential salt sensitivity, a pot experiment was conducted on ten upland rice genotypes (viz., Bahadur, Joymati, Ashoni Bara, Mulagacbhuru, Gitesh, Monoharsale and Moniram from Assam, and OM 5451, OM 6976, OM 4900 from Vietnam) under salinity condition (@ 0-30 mM ≈ EC 0, 40dSm^-1) imposed at vegetative and reproductive stages. In the study, the salinity stress reduced RLWC (1.6-9.2%), Pⁿ rate (25.6-46.6%), SLW (0.35-14.4%), root biomass (1.64-19.5%), shoot biomass (3.03-27.5%), Chl-a (14.53-81.89%), Chl-b (8.4-88.1%), total Chl (5.25-84.90%), NR activity (2.44-27.59%), grain carbohydrate contents (19.12-49.41%), but increased Proline content (2.954-88.49%) and lipid Peroxidase activity (10.87-93.94%). Based on the overall performance, the tolerance range of the rice varieties to salt stress condition as compared to control was Joymati>Bahadur>Gitesh>Monoharsali&Moniram>OM6976>Aghonibora= Mulagabhoru>OM5451=OM4900. Hence, in the experiment, varieties Joymati, the cultivar from India, and OM 6976, the cultivar from Vietnam emerged suitable under salt stress condition.

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