Improving drought resistance in rainfed lowland rice for the Mekong region: The experience from Cambodia and on the use of drought resistance index (DRI) as an integrative drought tolerance trait

摘要

Recent work on adaptation of rice to the rainfed lowlands of Cambodia has suggested a need to focus on three-target population (TPE) of environment, which account for 76% of the total variance due to environments (Basnayake et al., 2004). One of theseTPEs is characterised by predictable terminal drought where yields can be reduced by around 50%. Fuaki and Cooper (2001) suggest that under these conditions, better crop performance can be achieved by selecting for appropriate phenology and for droughttolerant traits.