Tobacco disease was a limit condition in tobacco production. The research of tobacco resistance and resistant breeding was efficient approach to solve the problem.
烟草病害是制约烟草生产的难题，研究烟草的抗病性和选育抗病品种是解决这一难题的有效途径。
The MHC genes are highly polymorphic and the research hot point in the origin and evolution of species and the disease resistant breeding.
MHC中的基因具有丰富的多态性，是物种起源、进化和动物抗病育种的研究重点之一。
Hybridization selection may expand the source of cotton germplasm, it is very important to improve the disease-resistant and high-quality breeding.
杂交选育可以扩大种质的来源，这对提高品种的抗病性和优质育种很重要。
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