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1985和1986年的试验表明,冬小麦品种和优良育种品系中有61个F_1代杂种的产量比高亲高5.9％。1986年430个杂交种的试验表明,杂交种的籽粒产量比高亲岗3.6％。在430个杂交种中,产量的杂种优势最高的是那些由产量最低的亲本杂交而成的杂交种。此结果说明,在这些遗传型中,大多数高产基因已被固定在高产的亲本中。 杂交种的穗数/m~2稍低,但穗粒数和粒重高于高亲。杂交种的茎杆产量和籽粒产量均较高。 将本试验结果与其它结果比较,可得出如下结论:目前为止所测定的F_1代杂种的产量优势还达不到在农业上利用的水平。
Tests in 1985 and 1986 showed that 61 F1 generation hybrids produced 5.9% higher progeny than winter wheat cultivars and elite breeding lines. Tests of 430 hybrids in 1986 showed that hybrids had 3.6% more grain yield than high progeny. Among the 430 hybrids, the highest yield heterosis was those crossed by the lowest yielding parents. This result shows that in these genotypes, most high-yielding genes have been fixed in high-yielding parents. Spike number of hybrids / m ~ 2 slightly lower, but grain number and grain weight per plant were higher than those of high progenies. Hybrids had higher stem yield and grain yield. Comparing this test result with other results, we can draw the following conclusions: The yield superiority of F_1 hybrids tested so far has not yet reached the level of agricultural utilization.