实践证明,许多作物的杂种具有优势。杂种玉米和杂种高梁从三十年代起就在生产上应用,并显示出巨大的增产作用,从而推动了其它作物杂种优势利用的开展。提型杂种小麦,虽在1965年即开始从国外引进研究,但对其究竟有没有优势、提型细胞质是否有不利 Practice has shown that many crop hybrids have advantages. Hybrid corn and hybrid sorghum have been used in production since the 1930s and have shown tremendous productivity gains that have driven the utilization of heterosis in other crops. Although the type of hybrid wheat, introduced in 1965 from abroad, but whether there is any advantage, whether to mention the cytoplasm negative