Factors limiting the area of cultivated rice (Oryza sativa L.) is the quantity of water that is enough. Because the rice will grow well in areas with the appropriate quantity of water. The lack of water, even a few hours, during which one of the range of growth can cause a decrease in productivity. Study on the effect of stress from lack of water, this time a Completely Randomized experimental plan Design (CRD) 4, by studying the effects of stress from lack of water of the rice chromosome 3 species that dares that 8 is replaced by the genes of drought-resistant (114, 118 and 123 species) vs. rice.Wotok Mali 105 by the underlying guts used in vitro experiments and bring culture to the bottle of liquid nutrition formula, using a dozen WP grown separately in the State is the normal state 3. Summer conditions (brought into Cabinet growing temperature control 50° c day/night-45° c) and dry (liquid food additives into the PEG so that the roots absorb less water.) Experimental results showed that in normal conditions and lack of water, rice, dry weight and early varieties 4 stage 0-15 days after sprouting is not different, but at the cost of dry weight found in hot conditions at the age of 12 and 15 days after sprouting of rice varieties with 4 different (p < 0.05) by the 123 species of dry weight average cost between 0.-Minimum 15 days after sprouting is equal to 0.023775 grams/ton. While the cost of dry weight of white Jasmine 105 most average 0.03465 grams/second is 114 and 118 species of dry weight average cost between 0-15 days after sprouting 0.028883 and 0.027792 grams/ton respectively. Indicates that the white varieties, jasmine, 105, 114 and 118 species as well as heat-resistant species in the order 1, 2, and 3, respectively. คำสำคัญ ข้าว , ยีนทนร้อน , ความเครียดจากสภาวะร้อน, ความเครียดจากสภาวะแล้ง
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