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天然自花或异花授粉作物的任何品种是个遗传方面程度不同的集团。甚至自花授粉的品种,也表现出多型性。人工选择较早熟的番茄植株留种能提高早熟性,在北部地区因此也就能提高品种的丰产性。在南部地区,从成熟较迟的植株上采收种子,可得到以果实成熟较迟为特点的后代。原种繁殖的第一代番茄种籽,其后代的生产力同原种种籽后代的产量相比低12—15％。假如在原种播种地上反复精选比较丰产和健壮的植株,那么品种能显著改良,后代产品的商品率高,产量比播种原种繁殖的第一代高17～22％。
Any variety of natural self-pollinated or cross-pollinated crops is a heterogeneous group of genes. Even self-pollinating varieties show polymorphism. The artificial selection of the more premature tomato plant species can increase the precocity, so in the northern region can also increase the variety of high yield. In the southern region, harvesting seeds from late mature plants gives offspring characterized by a later maturity of the fruit. The first generation tomato seeds of the original breed have 12-15% lower progeny productivity than their progeny seed progeny. If repeated selection of more productive and robust plants on the sown areas, then the varieties can be significantly improved, the progeny products have a high commodity yield, and the yield is 17-22% higher than that of the first generation of the original sown species.