The Study On Inheritance Variance Main Economy Character In Vary Part Cotton Bell Of Cotton

In order to choose the cotton bell position of the least hereditary variance and the biggest hereditary variance on main economy character,choosing the breeding and developing the cotton idioplasm resource,the test stat the variance coefficient of eight mainly economy character of 30 differ part bell on BM1,BM6,YM668 and HN109,the result is following conclusion:1)Bell weight:The variation coefficient of bell heavy is 0.91%～27.04%,the bell which coefficient variation is lower than the mean value(10.76%),mainly concentrates in the lower part fruit-bearing branch,upside the fruit-bearing branch and the crown fruit-bearing branch.The variation coefficient on 7th fruit-bearing branch's 3rd bell position(7-3)is the least,the variation coefficient on the 4th fruit-bearing branch's3rd bell position(4-3)is the biggest.2)Lint percent,the variation coefficient of lint percent is 0.79%～8.29%,the bell which variation coefficient of is lower than the mean value(4.7%),mainly concentrate in the middle fruit-bearing branch,lower part the fruit-bearing branch and crown fruit-bearing branch's in encircles the bell.The variation coefficient on 10th fruit-bearing branch's 2nd bell position(10-2)is the least,the variation coefficient on the 2nd fruit-bearing branch's2nd bell position(2-2)is the biggest.3)Seed finger:The variation coefficient of seed finger is 0.19%～12.48%,the bell which variation coefficient of seed finger is lower than the mean value(6.34%),mainly concentrate in the lower part fruit-bearing branch's,inside the upside and crown fruit-bearing branch's,the variation coefficient on 10thfruit-bearing branch's 2nd bell position(10-2)is the least,the variation coefficient on the 1st fruit-bearing branch's 2rid bell position(1-2)is the biggest.4)Length,the variation coefficient is 0.06%～2.01%,the bell which the length variation coefficient is lower than the mean value(0.97%)mainly concentrate inside.The variation coefficient on 10th fruit-bearing branch's 2nd bell position(10-2)is the least,The variation coefficient on the 2rid fruit-beating branch's 1st bell position(2-1)is the biggest. 5)Micronaire:The variation coefficient is 2.04%～9.27%,the bell which the variation coefficient of micronare is lower than the mean value(4.80%),mainly concentrates in the lower part, middle fruit-bearing branch.The coefficient of variation on 8th fruit-bearing branch's 1st bell position(8-1)is the least,the variation coefficient on the 1st fruit-bearing branch's 2nd bell position (1-2)is the biggest.6)Strength:The variation coefficient is 0.48%～7.47%,the bell which the strength variation coefficient is lower than the mean value(3.19%),mainly concentrates in the lower part 1～2fruit-bearing branches,the middle 5～6 fruit-bearing branches,the upside 9～10fruit-bearing branch.The variation coefficient on 10th fruit-bearing branch's 2nd bell position(10-2)is the least, the variation coefficient on the 8th fruit-bearing branch's 1st bell position(8-1)is the biggest.7)Elongation:The variation coefficient of is 0.74%～10.5%,the bell which the elongation ratio coefficient of variation is lower than the mean value(4.04%),mainly concentrates in the lower part 2～3fruit-bearing branches and 6～8 fruit-bearing branches and the crown 10th fruit-bearing branch. The variation coefficient on 10th fruit-bearing branch's 3rd bell position(10-3)is the least,the variation coefficient on the 8thfruit-bearing branch's 1st bell position(8-1)is the biggest.8)Uniformity:The variation coefficient is 0.25%～2.12%,the bell which the variation coefficient is lower than the mean value(1.00%),mainly concentrates on 3rd bell 10th fruit-bearing branch and in various fruit-bearing branches' periphery.The coefficient of variation on 10th fruit-bearing branch's position(10-3)the least,the variation coefficient on the 8th fruit-bearing branch's 3rd bell position(8-3)is the biggest.Next,in order to discovers the bell position of the biggest hereditary variance and the least hereditary variance,the test uses heritability in the broad sense of eight main economy characters, uses O distance and the Ward method carries on to 8 main economical characters of 30 different bell position gathers the kind,finally bell gathers 30 bell position to 6 kinds:【1】Theâ… kind,including 1-1,1-3,2-1,3-2,4-1,5-1,6-1,seven bell position together;【2】Theâ…¡kind,only including 8-2 bell position;【3】Theâ…¢kind,including 8-3,9-2,10-1,10-2,10-3,five bell position together;【4】Theâ…£kind,including 6-3,7-1,7-2,three bell position together;【5】Theâ…¤kind,including 3-1 and 9-3 bell position;【6】Theâ…¥kind,including 1-2,2-2,2-3,3-3,4-2,4-3,5-2,5-3,6-2,7-3,8-1,9-1, twelve bell position together.The inheritance variance coefficient of the I kind is least,the position of 4-1,5-1,6-1 are the most steady positions in inheritance breeding practice.The inheritance variance coefficient of theâ…£kind is most,the position of 6-3,7-1,7-2 are the least steady positions in inheritance breeding practice. At the same time,in order to choosing the position of inherits steadily and the synthesis character free,especially carry out the model correlation analysis,the factor analysis and general combining ability analysis.The result indicated,choose the economy character of high bell weight(rux1= 0.6980),then increase lint percent(rux₂=0.6556)together,increase uniformity(rux₈=0.5399)and strength(rux₆=0.3197)indirectly,,but it will lead to disadvantage influence certain degree to length(rux₄=-0.3197)and mieronaire(rux₅=0.4799),therefore,in the breeding practice,should pay attention to correspond the relation between them.The general combining ability analysis indicated that the fruit-bearing branch of BM₁is best,the HN109 is the least.The purpose of general combining ability provides certain theory reference guidance in cotton breeding practice.Finally,determining the bell position of big inheritance variance and small inheritance variance,thus,provides certain theory reference value for the cotton orientation breeding,and providing the certain theory instruction for the breeding practice.