Author(s):

Nguyen Viet Thanh and Bhagawan Bharali

Abstract: Salinity is a major abiotic stress factor worldwide as more than 45 million hectares of irrigated land have been damaged, and 1.5 million hectares are taken out of production each year as a result of high salinity. High salinity may cause a physiological drought condition, and imparts toxicity, nutritional disorders, oxidative stress, and alteration of metabolic processes, membrane disorganization, reduction of cell division and expansion, and all together growth and development of crop plants. Therefore, laboratory and pot experiments were conducted to evaluate ten upland rice genotypes (viz., Bahadur, Joymati, Ashoni Bara, Moleegacbhuru, Gitesh, Monoharsale and Moniram from Assam, and OM 5451, OM 6976, OM 4900 from Vietnam) for tolerance to salinity condition(@ 0-30 mM » EC 0, 40dSm^-1). In the study, seed germination and shoot vigour index were reduced significantly commensuration with the increase in salt (NaCl) concentration from 10 to 40 mM as compared to control. The effects of pre-treatments of seeds overnight separately with chemicals viz., Gibberellic acid (100ppm), Kinetin (100ppm), Thiourea (100ppm), Glucose (100ppm), Calcium chloride (100ppm), MoP (100ppm), improved seed germination, and shoot vigour index many fold under saline condition as compared to control. Reductions in yield and yield attributes viz., panicle length, panicle weight, test weight, economic yield, biological yield, harvest index and HD grains were found in all the varieties under soil salinity condition with 30mM NaCl. In the experiments, Joymati and OM 6976 were found physiologically efficient among the varieties tested against salt stress condition.

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