QTL Analysis Of Plant Height And Yield In Maize Under Water Stress And Normal Irrigation Condition

Genetic linkage map of maize groups based on 5003×P-138 developed by using simple sequence repeat (SSR) markers, and the plant height and yield of 450 RIL lines under normal and drought condition were primarily mapped, QTL points and genetic effect which controlled plant height and yield of maize, molecular genetic mechanism of drought tolerance were discussed, the relation between plant height, yield and drought tolerance were analyzed. The aim of this study was designed to provide theoritical reference for the genetic improvement of drought tolerance character in maize. The main results were as follows:1) RIL groups based on 116 polymorphism SSR positions were analyzed genotypically, Chi-square tests showed that: 15 positions represented genetic segregation distortion, were 12.93% in total positions,101 positions accorded with 1:1 segregation, were 87.07%, genetic map containing 101 positions was finished, covering with 1396.2 cM in genome of maize, the average distance was 13.81 cM.2) Under irrigation condition, 3 QTL positions controlled plant height were detected, located 4,9,10 chromosome respectively; 3 QTL positions controlled yield located 1st,2nd,7th chromosome respectively. Under drought condition, 5 QTL positions controlled plant height were detected, 1 of them was located in 3rd chromosome, 4 of them was located in 9th chromosome; and 3 QTL positions controlled yield were detected, located in 2nd,5th,6th chromosome respectively. Gene action manner was additive variance, and QTL positions were different under different water condition, but 1 relatively stable QTL position (was located in 2nd chromosome, drawing on the bnlg1225 position controlled yield) find.3) Under two treatment conditions, the relativity of plant height and yield reached at 0.13,0.16 level, but regression coefficient was lower, these can be confirmed from the results of QTL mapping. The relativity coefficient of drought treatment condition was bigger than the normal irrigation condition in the whole, the selecting of drought stress characteristic was more significant than under the normal irrigation. In addition, the relativity of plant height and 100-grain weight was not prominent under two water conditions, the results showed that selecting of drought stress characteristic via plant...