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麦二岔蚜(Schizaphis graminumRondani)引起小麦、燕麦、大麦和高梁的严重经济损失。近年来,曾研究过种质品系‘Amigo’(Triticumaestivum L.)和‘Largo’(Triticum turgidum XTtauschii)六倍体小麦对麦二岔蚜的遗传抗性。Amigo含有从黑麦(Secale cerealeL.)转移来的单显性基因。Largo是‘Langdon’硬质小麦(T.turgidum L.)和T.tauschii(Coss)Schmal的双倍体。 Largo和Amigo之间的杂交表明,每个亲本都有一种抗麦二岔蚜生物型C的独立基因。用一组“中国春”单体小麦品种测定Amigo和Largo抗性基因的染色体位置。把来自单体Fl的F2植株种植在直径为12厘米的盆钵中或平地上,生长到2至3叶时,接种生物型C的麦二岔蚜。我们发现Amigo的抗性基因位于染色体1A上,Largo的抗性基因位于染色体7D上。中国春单体小麦和Amigo之间杂交的染色体对的资料表明,Amigo不同于包括染色体6A、6B、7A和7B的两个相互易位的中国春单体小麦。
Schizaphis graminum Rondani causes serious economic losses of wheat, oats, barley and sorghum. In recent years, the genetic resistance to G. bifidum in hexaploid wheat germplasm lines ’Amigo’ (Triticumaestivum L.) and ’Largo’ (Triticum turgidum XTtauschii) has been studied. Amigo contains a dominance gene that is transferred from Secale cereale L. Largo is a diploid of ’Langdon’ Durum (T. turgidum L.) and T. tuschii (Coss) Schmal. Crossbreeding between Largo and Amigo showed that each parent had an independent gene that resisted biotype C of A. bispricola. Chromosome locations of the Amigo and Largo resistance genes were determined using a panel of “Chinese Spring” single-crop wheat cultivars. F2 plants from monomer F1 were planted in pots of 12 cm in diameter or on flat ground and grown to 2 to 3 leaves and inoculated with biotype C of wheat Aphid. We found that Amigo’s resistance gene is located on chromosome 1A and Largo’s resistance gene is located on chromosome 7D. The data from the chromosome pairs of the hybrid between Chinese spring wheat and Amigo show that Amigo differs from the two translocations of Chinese spring wheat including chromosomes 6A, 6B, 7A and 7B.