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向日葵属(Helianthus)的染色体基数为17,类似于小麦属在进化中形成了二倍体(2n=2x=34)、四倍体(2n=4x=68)和六倍体(2n=6x=102)等几个倍性系列的种。在一些自然群体中也偶尔发生极低频率的单倍体。据Gundaev(1971)研究,双胚向日葵可能有介于单倍体和双倍体之间的染色体数目,由这个材料可获得一套连续的非整倍系列。非整倍体也能从种间杂交得到。有关性状的遗传扼述如下。
The chromosome base number of Helianthus is 17, which is similar to that of the genus Triticum that formed diploid (2n = 2x = 34), tetraploid (2n = 4x = 68) and hexaploid (2n = 6x = 102) and several ploidy series of species. Occasionally, very low frequency haplotypes occur in some natural populations. According to Gundaev’s (1971) study, the double embryo sunflower may have a number of chromosomes between haploid and diploid, from which a series of consecutive aneuploidy series can be obtained. Aneuploidy can also be obtained from crossbreeds. The genetic description of the trait is as follows.