Screening rice varieties for cold tolerance at early seedling stage [India]
1988
Mani, S.C. | Sharma, J.P. (G.B. Pant Univ. of Agriculture and Technology, Pantnagar Uttar Pradesh (India))
Eleven (11) promising indica varieties were screened for cold tolerance at the early seedling stage. In the procedure, 50 uniform seeds of each variety were soaked in water for 24 h in petri dishes, drained, washed thoroughly with distilled water, then covered with moist paper towels and kept at room temperature for 3 d. Germinated seeds were submerged in water in petri dishes and refrigerated at 4 degrees Celsius for 10 d. After 10 d the petri dishes were removed from the refrigerator. The seeds were kept at room temperature for 1 d, placed in sunlight for 5 d, then scored for cold tolerance. No variety was completely tolerant. T3, Mahsuri, and VL 191 scored 3; however, T3 and Mahsuri are not suitable for hill planting because of their long duration (135 d), VL 206, recommended for Mar or Apr sowing in the hills, and Rasi and IR58 scored 5. Other varieties had poor seedling survival.
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