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一、后代选择问题的研究现状1.关于组合选择淘汰问题过去,很多育种单位每年都进行40～60个杂交组合。在早期世代(F_2)只根据成熟期、株高、长势、种皮色泽等淘汰少数表现极差的组合,因而造成杂交后代组合多,而每组合材料并不多(F_2代种植数量每组合1,000～2,000株,成熟时从中选择优良单株1/10,即100～200株)。早期世代所以不敢冒然大量淘汰组合,是由于过去国内外的大
First, the status quo of research on the issue of future generations 1. On the elimination of the combination of options In the past, many breeding units every year for 40 to 60 hybrid combinations. In the early generation (F_2), only a few poorly performing combinations were eliminated based on maturity, plant height, growth and seed coat color, resulting in more combinations of hybrids with less material per combination (F_2 generations were planted at 1,000 ~ 2,000 strains, select the good one-tenth of the plants at maturity, that is, 100 ~ 200 strains). Early generations did not dare to take a large number of out of portfolio, is due to the past at home and abroad