Received: 27-12-2017 / Accepted: 09-10-2018
The objective of this study was to determine effect of salinity levels of irrigated water on growth, yield and proline production of rice varieties grown on saline-affected soil. A 5 x 4 factorial experiment including 5 rice varieties (Pokali - salt tolerant, IR28 - susceptible, OM5451, MTL547 and OM8017) and 4 salinity levels (0-control, 3, 4, và 5‰) was arranged in a randomized complete block design with four replicates in greenhouse. Results showed thatrice variety OM8017 gained the highest plant height, filled grain number per panicles, 1.000 grain weight, and rice yield, whereas rice variety MTL547 accumulated the highest proline production. Besides, saline irrigation water with a salt concentration of ≥3‰ decreased plant height, number of panicles, filled grain number per panicle, 1.000 grain weight, and rice yield. Rice yield was reduced by 20.0, 57.3 and 56.6% when irrigated with water containing 3, 4 and 5‰ salinity, respectively. Proline accumulation in rice stalk and sodium content in soil increased with increasing salinity levels.