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 scr...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.展开更多
To enhance understanding of the genetic basis of trait correlation in rice,a recombinant inbred line(RIL)population(F6 and F7) from a cross between Zhenshan97 and HR5 was employed to identify main quantitative trait l...To enhance understanding of the genetic basis of trait correlation in rice,a recombinant inbred line(RIL)population(F6 and F7) from a cross between Zhenshan97 and HR5 was employed to identify main quantitative trait loci(QTLs)and epistatic QTL(E-QTL).Highly significant positive correlations were detected among five traits of heading date(HD),plant height(PH),panicle length(PL),flag leaf length(FLL)and flag leaf width(FLW)in 2 environments.Four to 8 main QTLs were detected for an individual trait.No E-QTL was detected for PH.One,4,4 and 5 E-QTLs were detected for FLL,HD,FLW and PL,respectively.Each E-QTL individually explained less than 3%of trait variation except E-QFll1.Comparison of QTL results was made in order to dissect the genetic basis of trait correlation.We found that main QTLs with pleiotropic effects and QTL clusters were the main genetic basis of trait correlation.No E-QTL had pleiotropic effects.E-QTL played an important role in the genetic basis of individual trait,but it made a little contribution to trait correlation.展开更多
基金This study was supported by the Hi-Technology Research and Development Program of China(Grant No.2003AA207010)the National Basic Research Program of China(Grant No.2004CB 117204)..
文摘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.
基金supported by grants from the National Basic Research Program of China(2007CB109001)the Doctoral Fund for Promoting Scientific Research from the Natural Science Foundation of Guangdong Province(8452840301001691)
文摘To enhance understanding of the genetic basis of trait correlation in rice,a recombinant inbred line(RIL)population(F6 and F7) from a cross between Zhenshan97 and HR5 was employed to identify main quantitative trait loci(QTLs)and epistatic QTL(E-QTL).Highly significant positive correlations were detected among five traits of heading date(HD),plant height(PH),panicle length(PL),flag leaf length(FLL)and flag leaf width(FLW)in 2 environments.Four to 8 main QTLs were detected for an individual trait.No E-QTL was detected for PH.One,4,4 and 5 E-QTLs were detected for FLL,HD,FLW and PL,respectively.Each E-QTL individually explained less than 3%of trait variation except E-QFll1.Comparison of QTL results was made in order to dissect the genetic basis of trait correlation.We found that main QTLs with pleiotropic effects and QTL clusters were the main genetic basis of trait correlation.No E-QTL had pleiotropic effects.E-QTL played an important role in the genetic basis of individual trait,but it made a little contribution to trait correlation.
