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杂交种增产的奥秘在种植玉米的几千年里,人类对玉米种子的选择多半是盲目性的。古代印第安人常常把色泽鲜艳、硕大美丽的玉米果穗作为祭祀的供品,第二年再作为播种用。杂交玉米的产生是玉米进化史上的一次跃进。采用人工杂交育种的方法使玉米产生强大的生活力,并显著地提高了产量。杂交玉米首先要培育自交系,就是用两种不同类型的玉米各自用人工套袋的方法,强制用本株雄穗的花粉授于雌穗,这就叫自交。从自交后代中选择优良植株继续进行4代到6代自交,所得到的后代就称为自交系。用两个
Mystery of hybrids yielding In the cultivation of corn thousands of years, the human choice of corn seeds are mostly blind. Ancient Indians often bright color, large and beautiful corn ear as sacrificial offerings, the second year and then used as sowing. The production of hybrid corn is a leap forward in the evolutionary history of corn. The method of artificial hybrid breeding gives the corn a strong viability and significantly increases the yield. First of all, to breed hybrid corn inbred lines, that is, with two different types of maize each bagged with artificial methods, mandatory use of the tassel of the tassel granted to the ear, which is called self-self. Select good plants from the selfing offspring continue self-generation 4 to 6 generations, the resulting offspring is called inbred lines. Use two