蛋白质和脂肪含量对油菜籽品质性状间相关性的影响

Impacts of Protein and Fat Contents on Correlations of Quality Traits for Rapeseed

采用包括胚、细胞质和母体植株基因效应的非条件和条件分析方法,研究了蛋白质含量和脂肪含量对油菜籽硫苷含量与其他品质性状间遗传相关性的影响。结果表明,硫苷与蛋白质含量或脂肪含量间存在极显著的相关性,可以利用条件分析的方法排除蛋白质含量或脂肪含量对硫苷的影响,进而深入分析硫苷和其它品质性状间存在的真实遗传相关性。条件分析结果表明,在排除蛋白质含量对硫苷含量的影响后,条件硫苷与棕榈酸的表现型相关和基因型相关以及条件硫苷与亚油酸的基因型相关由非条件分析时的极显著负相关转为条件分析时的显著或极显著正相关;而在排除脂肪含量对硫苷含量的影响后,条件硫苷与花生烯酸的表现型相关和基因型相关则由显著正相关转为极显著负相关;条件硫苷与芥酸、油酸或亚油酸间的一些相关性也由非条件分析时的极显著水平转为未达显著水平,说明蛋白质含量或脂肪含量的高低对硫苷与脂肪酸成分间的相关性有着明显的影响。胚、细胞质和母体植株等不同遗传体系的条件相关分量表明,当排除了蛋白质含量或脂肪含量的影响后,条件硫苷与脂肪酸成分成对性状间的条件相关分量会产生与非条件分析明显不同的结果,其中以胚加性主效应、细胞质主效应相关和母体加性互作相关等分量的变化尤为明显。

Impacts of protein and fat contents on the genetic correlations between glucosinolate content （GC） and other quality traits in rapeseed were analyzed by using unconditonal and conditional methods related to genetic effects from the diploid embryo nuclear genes, cytoplasm genes and diploid maternal plant nuclear genes. It is found that there is significant relationship between GC and protein content （PC） or fat content （FC） of rapeseed, and the conditional analysis method can be used to exclude the influences of PC and FC for further revealing the actual genetic relationships between glucosinolates and other quality traits. The conditional analysis reveals that the significant negative phenotypic and genotypic relationships between GC and palmitic acid content or the significant negative genotypie relationship between GC and linoleic acid content observed for the unconditional analysis are changed to significant positive relationships from conditional analysis after excluding the influences of PC. By excluding the influences of FC from conditional analysis, the significant positive phenotypic and genotypic relationships from the unconditional analysis between GC and eicosenoic acid content are translated to significant negative. Some significant phenotypic and/or genotypic relationships at the unconditional analysis are changed to non- significant at the conditional analysis between GC and erucic acid, oleic acid, linoleic acid or linolenic acid contents, which indicates that the level of PC or FC of rapeseed earl affect the correlations between GC and the components of fatty acids. After eliminating the influences of PC or FC, the correlative components from different genetic systems reveal that the genetic effects of embryo, cytoplasm and maternal plant can significantly affect the conditional relationships of pairwise traits between the conditional GC and the fatty acids, especially for the embryo main effect, the cytoplasmic main effect and the maternal additive interaction effects.