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随着工农业生产的发展和人民生活水平的提高,对棉花品种提出了更高的要求。不仅要求棉花高产稳产,而且要具有适合机械化栽培特性;纤维品质优良,适合于同化学纤维混纺;对病虫具有高抗多抗特性,以减少使用农药,降低成本,保护环境;改良种子品质,提高含油量,并适合于作高含蛋白质的饲料。为了达到对棉花品种的这些要求,必须扩大育种的种质来源。通过远缘杂交,将棉属野生科和半野生种的某些特性转移于栽培种,是扩大种质来源的一个重要途径。从一个棉种转移少数基因于另一个种而不影响种的遗传平衡是完全可能的。在生物进化过程中,特别是由于生态条件发生很大
With the development of industrial and agricultural production and the improvement of people’s living standards, higher requirements are put forward on cotton varieties. Not only requires high and stable yield of cotton, but also has the characteristics of suitable for mechanized cultivation; excellent fiber quality, suitable for blending with chemical fibers; high resistance to pests and poly-resistance characteristics to reduce the use of pesticides, reduce costs and protect the environment; improve seed quality, Increase oil content and are suitable for high protein feed. In order to meet these requirements for cotton varieties, the germplasm of breeding must be expanded. Some of the traits of wild and semi-wild species of Gossypium are transferred to cultivated species through distant crosses, which is an important way to expand germplasm sources. It is entirely possible to transfer a few genes from one cotton species to another without affecting the genetic balance of the species. In biological evolution, especially because of ecological conditions have occurred