甘蓝型油菜氮素籽粒生产效率的杂种优势分析

目的]研究甘蓝型油菜N素籽粒生产效率的杂种优势,为生产上N高效品种的选育提供理论参考。方法]测定2个N肥水平下6个甘蓝型油菜亲本（浙双3号、扬油7号、ZJ1、史力佳、宁油14号和沪油16）及其完全双列杂交组合成熟期干物质生产及N素含量;分析并计算N素籽粒生产效率的杂种优势、配合力效应以及遗传力大小。结果]N素籽粒生产效率存在明显的杂种优势;配合力方差分析表明N素籽粒生产效率受加性效应、非加性效应和细胞质效应的共同影响;遗传方差分析表明低N条件下N素籽粒生产效率的基因加性作用和非加性作用都比较重要,而高N条件下则以基因的非加性效应为主。结论]油菜N素籽粒生产效率存在明显的杂种优势。

Heterosis Analysis of Nitrogen Use Efficiency for Grain Production of Brassica napus L.

Objective] The aim was to study heterosis of N use efficiency for grain production (NUEg) of Brassica napus L. and provide theoretical basis for breeding N-efficient cultivars. Method] Dry matter production and N content of six B. napus parents (Zheshuang 3,Yangyou 7,ZJ1,Shilijia,Ningyou 14 and Huyou 16) and their F1 combinations from 6×6 complete diallel cross in maturity stage under two N levels were measured; heterosis of NUEg,combining ability and heritability size were analyzed and calculated. Result]The results showed that NUEg has obvious heterosis; combining ability variance analysis indicated that NUEg was mainly controlled by additive,dominant and cytoplasmic effects; genetic variance analysis showed that additive effects and dominance effects were all significant in low nitrogen fertilizer and dominance effects were significant in high nitrogen fertilizer. Conclusion] NUEg of B. napus has obvious heterosis.