6个库尔勒香梨品种果实矿质元素与品质的相关性和通径分析

应用相关性分析和通径分析的方法分析6个库尔勒香梨品种果实矿质营养元素和品质指标之间的相关性和通径系数,筛选影响果实品质指标的主要矿质元素因子,为合理施肥及果实提质增效提供理论依据。结果表明,不同梨品种的果实品质和矿质元素含量存在一定程度的差异,果实品质中石细胞含量变异系数较大,可溶性固形物含量变异系数较小;果实矿质元素中P含量变异系数较大,Mg含量变异系数较小。相关性分析表明,部分果实品质指标与部分矿质元素含量之间存在一定的相关性。通径分析进一步明确了Ca对单果质量、果实硬度和可溶性固形物具有最大的正直接作用,N对可溶性糖、可滴定酸和VC具有最大的正直接作用,P对糖酸比和石细胞具有最大的正直接作用;Cu对果实硬度、可溶性固形物和石细胞具有最大的负直接作用,Fe对可滴定酸和VC具有最大的负直接作用,Zn对可溶性糖具有最大的负直接作用,N对单果质量和糖酸比具有最大的负直接作用。生产中要合理调控各种矿质元素的施肥配比,从而实现梨果的优质生产。

Correlation and Path Analysis between Fruit Quality and Mineral Elements of 6 Varieties of Korla Fragrant Pear

In order to screen out the major mineral elements that affect fruit quality for the purpose of providing a theoretical basis for rational fertilization to improve fruit quality and economic benefits in pear orchards, the correlation and path coefficients between mineral elements and fruit quality indicators in six Korla fragrant pear varieties were computed by using correlation and path analysis. The results showed that there were significant differences in fruit quality traits and mineral elements contents between the varieties. The coefficient of variation (CV) of stone cell content was larger than that of other quality indices, while the CV of soluble solid content was smaller. The CV of P content was larger than that of other mineral elements, and the CV of Mg content was smaller. Correlation analysis indicated that there was a simple correlation between some fruit quality traits and some mineral elements. Path analysis further demonstrated that Ca had the maximum positive direct effects on single fruit mass, firmness and soluble solid content, N showed the maximum positive direct effects on soluble sugar, titratable acid and vitamin C content, P had the maximum positive direct effects on the ratio of soluble sugar to titratable acid and stone cell content. On the other hand, Cu had the maximum negative direct effects on fruit firmness, soluble solid and stone cell content, Fe had the maximum negative direct effects on titratable acid and vitamin C content, Zn had the maximum negative direct effects on soluble sugar content, and N had the maximum negative direct effects on single fruit mass and the ratio of soluble sugar to titratable acid. Reasonable proportions of various mineral nutrient elements in fertilizers are required for better production of pear.