The team made the discovery while hunting for genes that boost heterosis, the phenomenon by which cross-breeding two varieties of plants produces more vigorous hybrid offspring with higher yields.
研究团队在寻找促进杂交优势的基因的时候发现，将两种植物杂交出的更具优势的子代，其产量更高。
2
The epistatic effects could not be ignored in tobacco breeding. They were one of main causes of heterosisfor most characters.
互作效应普遍存在，是烟草性状杂种优势表现的主要原因之一。
3
Furthermore, the genetic basis of heterosis was revealed on average level of gene and molecular level. All these results provided theoretic basis for cotton hybrid breeding.