将两个具有不同遗传类型的水稻品种进行杂交,所产生的后代,叫做杂种。它的第一代比双亲表现出生长健壮,根系发达,分蘖力强,适应性广,丰产性高,增产显著等优点,就叫做杂种优势。人们利用杂种的第一代,进行大面积生产,促进水稻产量大幅度增长,称为杂种优势利用。这种表现是生物界的普遍规律,达尔文说这是“自然界的伟大法则”。 Two varieties of rice with different genetic types are crossed, resulting in offspring called hybrids. Its first generation than their parents showed growth robust, well-developed root system, strong tillering ability, wide adaptability, high yield, significant yield, etc., is called heterosis. People use the first generation of hybrids to carry out large-scale production and promote a substantial increase in rice yield, known as the utilization of heterosis. This performance is a universal law in the biological world, Darwin said that this is “a great law of nature.”