Estimation of Drought Tolerance Based on Leaf Temperature in Upland Rice Breeding

摘要: The evaluation of drought tolerance based on the leaf temperature was examined in upland rice breeding. relationships with transpiration and photosynthetic rates were observed lowland varieties under cultivation 1995, 1996 1997. lower than that varieties. Their highly correlated temperature, measured using an infrared radiation thermometer or portable photosynthesis gas analyzing system all three years. also showed a significant relationship grain yield tested 1995. It is considered can maintain high as well produce conditions. In addition, there positive correlation between root growth recorded by trench method. Upland deep rooting temperatures those shallower system. On other hand, comparison varietal groups breeding materials, lines medium-late maturity lowest followed early maturing for sprinkler irrigation. This tendency agreement general degree individual groups. To analyze mode inheritance parent-offspring materials. Leaf compared progeny (F4 generation) variety Kantomochi168 Norinmochi4 medium tolerance. Norinmochi4. A similar confirmed F5 generation following year. Significant parental-offspring (r = 0.812**) F4 F5. Since may display relatively higher inheritance, is, therefore, to be useful indicator estimate line selection