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Canopy temperature (CT), leaf water potential (LWP) and spikelet fertility (SF) of a set of RILs (F9) from the cross between Zhenshan97B and IRAT109 were investi- gated under two soil moisture regimes in a drought screen facility. In water stress condition, CT was negatively corre- lated with SF (r = ?0.2867) and LWP (r = ?0.2740), and LWP was positively associated with SF (r = 0.1696). These results indicated that the plant with high drought tolerant ability could maintain higher LWP and lower CT, leading to higher SF. A total of 44 main effect QTLs were associated with CT, LWP and SF. The accumulated contributionsof QTLs forCT, LWP and SF were 87.85%, 15.06%, 79.46% under well water condition and 72.61%, 87.68%, 33.29% under stress condi- tion, respectively. Totally 45 pairs of digenic interactions were detected. The accumulated contribution of digenic epistasis on CT, LWP and SF were 55.69%, 47.15%, 48.15% under well water condition and 53.44%, 57.94%, 54.62% under water stress condition. Compared with other drought tolerance QTL mapping researches in rice, 19 main effect QTLs were found to be located at the same or closely con- joint regions.
Canopy temperature (CT), leaf water potential (LWP) and spikelet fertility (SF) of a set of RILs (F9) from the cross between Zhenshan 97B and IRAT 109 were investi- gated under two soil moisture regimes in a drought screen facility. In water stress conditions, CT was negatively associated with SF (r =? 0.2867) and LWP (r =? 0.2740), and LWP was positively associated with SF (r = 0.1696). These results indicated that the plant with high drought tolerant ability The total contributions of QTLs for CT, LWP and SF were 87.85%, 15.06%, 79.46% under well water Totally 45 pairs of digenic interactions were detected. The accumulated contribution of digenic epistasis on CT, LWP and SF were 55.69%, 47.15%, 48.15% under well and 72.61%, 87.68%, 33.29% under stress condi- tion, respectively. water condition and 53.44%, 57.94%, 54.62% under water stress cond ition. Compared with other drought tolerance QTL mapping researches in rice, 19 main effect QTLs were found to be located at the same or closely con- junction regions.