青贮玉米单交种、三交种对生物产量的影响

为了研究青贮玉米单交种、三交种对F1的影响,选用6个有代表性的青贮玉米育种材料,组配成4组不同的单交种、三交进行产量观测试验。结果表明,第二单交组合与第一单交组合、三交组合间存在显著差异,是优良组合;第一单交组合与三交组合间基本持平。说明单交组合在生物产量上有显著的优势(一般配合力情况)。B2组的单交组合的生物产量增产显著。但在特殊组合产量比较时,第二组的三交组合产量最高。单交组合能更广范地提高青贮玉米的生物产量。但也不否认特殊的三交组合可以获得好的生物产量。通过产量回归分析得知,各指标与产量的相关性排序为:株高>籽粒>行粒>穗长>秸秆>穗位高,且均达极显著水平,穗粗达显著水平,穗行与生物产量成正相关,果穗秃长与生物产量成负相关。

Effect of Single-crossed Hybrid and Tri-crossed Hybrid of Silage Maize on their F1 Hybrids

In order to research the effect of silage maize single-crossed hybrid and tri-crossed hybrid on their F1 hybrids,six inbred lines of silage maize were selected to make up four groups of singe-crossed hybrids and tri-crossed hybrids for comparison of yield performance.The results showed that the single-crossed hybrids of B2 showed significant difference from the single-crossed hybrids of B1 and tri-crossed hybrids of B3,and no significant difference between single-crossed hybrids of B1 and tri-crossed hybrids of B3, suggesting that single-crossed hybrid had advantage on yield. The single-crossed hybrids of B2 led to a significant increase in yield, while the tri-crossed hybrid in the second group showed the maximum yield. The single crossed hybrid led to a general increase in yield of silage maize, and the tri-crossed hybrid could obtain a good yield. Regression analysis of yield revealed that factors order of being very significantly positively correlative with yield were: plant height>maize seed> grain number >ear length>straw weight>ear height per row, ear width was significant correlation. ear row number,was positively correlative with yield, and negative correlation was found between rare ear and yield.