การคัดเลือกข้าวไร่พื้นเมืองทนทานต่อสภาพแล้งต้นฤดูปลูก

Abstract

Upland rice occupied 47 percent of rice production area of the northern Thailand. Production of upland rice is facing with drought particularly in early stage of growth. This study was aimed at evaluation of indigenous upland rice for early drought resistance. The experiment was conducted in greenhouse. One hundred and eighty seven upland rice varieties including ULR 135 (resistant check) were grown in plastic pots. Randomized complete block design with 2 replications was laid out. Seeds were sown in pots under greenhouse condition. Two seedling were let to grow in each pot. Early drought was performed at 28 days after planting (DAP) for 17 days. Leaf rolling was recorded at 38 and 43 DAP whereas death leaf and recovery percentage was evaluated at 45 and 53 DAP. Results showed a highly significant in all traits. ULR 137 and ULR 328 showed a very high ability of drought tolerance with the highest drought recovery score resulted from low level of leaf rolling and death leaf.ULR 137 and ULR 328 were thus defined as promising drought resistance lines. However, lines out of those will be further evaluated under field condition.