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根据杂种优势的理论,两杂(杂交玉米、杂交高粱)制种双亲性状差异较大的,其后代优势往往偏大。那么表现在生育期上如何呢?对此,我们进行了试验。 1986～1988年,我们连续3年对双亲生育期相差5天以上的17个组合、相差3～5天的21个组合、相差0～3天的15个组合进行了试验分析,发现参试组合的生长势和生活力存在明显的差异。生育期相差5天以上的17个组合中,有12个组合的生长势和生活力大于生育期相差3～5天的组合;有16个组合的生长势和生活力大于生育期相差0～3天的组合;有1个组合比生育期相差0～3天的组合低。可见,双亲生育期相差越多,其后代有生长势越强、生活力越高的趋势。
According to the theory of heterosis, the heterosis of two hybrids (hybrid corn, hybrid sorghum) is different, and their offspring advantages tend to be larger. So what is the performance in the growth period? In this regard, we conducted a test. From 1986 to 1988, we conducted a series of experiments on 17 combinations with a difference of more than 5 days between their parents in three consecutive years, 21 combinations with 3 ~ 5 days difference and 15 combinations with 0 ~ 3 days difference. The growth potential and vitality there is a clear difference. Among the 17 combinations with more than 5 days growth period, 12 combinations had a greater growth potential and viability than the growth period by 3-5 days. The growth potential and viability of 16 combinations differed by 0-3 Day combination; there is a combination of a combination of 0 to 3 days lower than the growth period combination. Can be seen, the more difference between the parents of the growing period, the stronger the growing potential of their offspring, the higher the trend of life.