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普通荞麦或甜荞[Fagopyrum esculentum(2n=2x=16)],具有异型花、孢子体型自交不亲和性。在远缘杂交中,甜荞的非落粒性常会丧失。本研究的目的是用由落粒野生种(F.homotropicum)组配的杂种来探讨荞麦落粒的遗传性。借助胚珠培养,获得了来自4个远缘杂交组合(F.esculentum×F.homotropicum)的杂种。8个F2群体,28个来自F2落粒植株的F3系用于遗传分析。落粒的F1说明落粒是显性的。F2群体的3∶1,9∶7,和27∶37的分离类型支持这里首次提出的遗传模式,落粒是由3对显性基因控制的。造成不同分离类型的原因归结于F.esculentum的由异交引起的群体异质性。Fagopyrum homotropicum的基因型应是纯合显性才能确保群体的落粒性,而F.esculentum应在至少1个基因位点上固定为纯合隐性,才能保持群体的非落粒性。此研究解释了为什么1个没有落粒亲本的组合或非落粒的植株自交会产生落粒的后代。
Common buckwheat or buckwheat [Fagopyrum esculentum (2n = 2x = 16)], has a flower, sporozoite self-incompatibility. In distant hybridization, sweet buckwheat non-shedding often lose. The purpose of this study was to investigate the inheritance of buckwheat larvae using hybrids assembled from F.homotropicum. With the aid of ovule culture, hybrids from four distant crosses (F. esculentum × F.homotropicum) were obtained. Eight F3 populations and 28 F3 lines from F2 fallout plants were used for genetic analysis. Flocculated F1 shows that the drop is dominant. The 3: 1, 9: 7, and 27:37 segregation types of the F2 population support the genetic model first proposed here, with the control of three dominant genes. The reason for the different types of segregation is due to the heterogeneity of F. esculentum caused by outcrossing. The genotype of Fagopyrum homotropicum should be homozygous dominant to ensure population shattering while F. esculentum should be fixed homozygous recessive at at least 1 locus to maintain population non-shattering. This study explains why a single non-ragged parental assemblage or non-ragweed progeny would produce off-shoots from the cross.