节瓜果皮颜色遗传规律的研究

用2个果皮青绿色自交系桂优1号毛节瓜、环江节瓜和1个果皮深绿色自交系七星节瓜作亲本,通过正、反交及回交组配,对其杂交组合(桂优1号毛节瓜×七星节瓜、环江节瓜×七星节瓜)的F1、F2、BC1和BC2各世代的果色进行统计.结果表明:F1果色表现一致,无论正、反交均表现为深绿色;F2果色无论正、反交都分离出深绿色和青绿色两种果色,且分离比率接近3:1;BC1(以深绿色的自交系作父本进行回交)果实颜色均表现为深绿色,BC2(以青绿色的自交系作父本进行回交)果实颜色则表现出深绿色和青绿色的分离,分离比率接近1:1.根据经典遗传学原理对节瓜果皮颜色的遗传效应进行了研究,初步推断出:节瓜果实的深绿色与青绿色受一对核基因控制,深绿色对青绿色为显性.

Study on Inheritance of Fruit Colour in Chieh-qua

Two inbreds with turquoise blue fruit color,Guiyou No.1 and Huanjiang,and an inbred with dark blue fruit color called Qixing were utilized as parental lines in a mating pattern as Guiyou No.1 Qixing,Qixing Guiyou No.1;and Huanjiang Qixing,Qixing Huanjiang for a study of inheritance of fruit color in Chieh-qua.The statistical figures showed that in their F1 generations,all the plants showed was dark blue fruit color.However,in their F2 generations,segregation of dark blue and turquoise blue colors appeared in a ratio of almost 3 to 1.For their backcrosses,all the BC1,F1(the inbred with dark blue fruit color used as recurrent parent)generations showed dark blue.But in their BC2,F2(using the inbred with green fruit color as recurrent parent)generation,segregation of dark blue and turquoise blue colors appeared in a ratio of almost 1 to 1.So we concluded that each of the dark blue and turquoise blue fruit color in Chieh-qua was controlled by one pair of different nuclear gene.But dark blue was dominant to turquoise blue.