...遗传趋势；多性状非求导约束最大似然法 [gap=1018]Key words： the new Yorkshire dam line with high prolificacy； phenotypic trends； genetic trends； multiple traits derivative free restricted maximum likelihood （MTDFREML） ..
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发布在期刊《遗传趋势》（Trends in Genetics）上的一篇科学评论说，大多数科学研究人员都相信葡萄的历史至少有六千五百万年。现在的很多葡萄品种都是古老品种的直系后代。
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本文借助矩阵计算，严密论证了一类轮回杂交实验中基因型的多代遗传趋势。
In this paper, we have proved strictly the tendency for the inheritance of genotypes in multi—generation recurrent crossing by the matrix computation.
阐述了甘薯瘟菌系致病类型、品种抗性分类、抗性遗传趋势和病菌潜伏侵染特征；
The pathotypes, classification of cultivar resistance, advancement of resistance genetics and latent infection of bacterial wilt disease of sweet potato were presented.
其目的是扭转树种数量下降的趋势，或至少保存所有树种的“遗传物质”。
The aim is to reverse the decline in the number of tree species or at least to preserve the "genetic material" of all of them.
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