Study On The Stigma Exsertion Habit Of Male Sterile Line And The Correlation Of Floral Character

Floral characters,exserted stigmas percentage of 7 three-line MS lines(hua37A, T98A,Ⅱ-32A,V20A,jin23A,youⅠA,longfuA) and 7 two-line MS lines(zhu1S, lu18S,C815S,Y58S,longS,Z9S,peiai64S) and the correlation and path analysis of floral characters related to exserted stigmas percentage.The main results showed:(1) Spikelet traits.Spikelet opening time ofⅡ-32A(4.18h) was longest. peiai64S(1.83h) and Y58S(1.36h) were short.Opening angle of spikelet of T98A(42.89°) was biggest,the other are all beyond 35°.(2) Floral characters.Stigma length of T98A and Y58S(1.97 mm) were longest. longfuA(1.58 mm) and V20A(1.54 mm) were short.Stigma width of T98A were widest(0.84 mm).longfuA(0.64 mm) and Z9S(0.52 mm) were narrow.Stigma span of lu18S(3.60 mm) were biggest.Hua37A(2.91 mm) and T98A(2.88 mm) were small.Stigma area and volume of T98A were biggest,longfuA and V20A were small.(3) Exserted stigma percentage and variety per day.Exserted stigma percentage of Y58S(89.41%),the order of other MS lines in the sequence of descending was peiai64S,T98A,longfuA,Z9S,longS,lu1S,C815S,hua37A,lu18S,youⅠA,jin23A,Ⅱ-32 A,V20A.The exserted stigma percentage of 14 MS lines all descend with the day by day.(4) The correlation and path analysis of floral characters related to exserted stigma percentage showed that stigma span,spikelet length,length-width ratio of spikelet and ovary length to exserted stigma percentage,their correlation coefficient was 0.7848,0.5246,0.6307 and 0.6165,respectively.The correlation of exserted stigma percentage and other traits had no significant.The direct effect of length-width ratio of spikelet to exserted stigma percentage was the biggest.The path coefficient was 1.5366.The path coefficient of stigma span to exserted stigma percentage was 0.6204.The path coefficient of ovary length to exserted stigma percentage was 0.0573. The path coefficient of spikelet length to exserted stigma percentage was -0.9847.This results showed that spikelet length mainly through the impact of length-width ratio of spikelet exposed to exserted stigma percentage impact.