南京林业大学学报（自然科学版）2025，Vol.49Issue(1)：119-127,9.DOI:10.12302/j.issn.1000-2006.202401005
早实核桃坚果表型和内在品质的关联分析及模型构建
Correlation analysis and model construction of nut phenotype and kernel quality of early-fruiting walnuts(Juglans regia)
摘要
Abstract
[Objective]There are correlations between phenotypic traits and fruit qualities.This study clarifies the relationships between nuts'phenotypic traits and kernels'qualities in early-fruiting walnuts from the Beijing-Hebei region,aiming to construct association models that provide a basis for preliminarily distinguishing nut qualities through phenotypic traits.[Method]The research focused on the superior genotypes of early-fruiting walnuts(Juglans regia)in the selection nursery at the Beijing Academy of Agricultural and Forestry Sciences.Nine nut phenotypic traits and four kernel qualities were measured during the fruit ripening stage.Based on these data,coefficients of variation,correlations,and variances were analyzed,and suitable regression models were constructed through fitting verification.[Result](1)The variation across 13 nut indices reaches a very significant level(P＜0.01),with the coefficients of variation ranging from 5.43％to 28.63％.Except for sphericity,geometric average diameter,kernel yield,oil content,and protein content,the coefficients of variation for all other indicators exceed 10％.(2)Nut qualities exhibit intercorrelations.Oil content is closely related to the kernel yield and shows a significant positive correlation with soluble sugar content,but it is not closely related to starch or protein content.The protein and soluble sugar content demonstrate similar relationships with nut phenotypic traits,showing a significant negative correlation with nut size and dry weight and a significant positive correlation with volume kernel yield.Both are also significantly negatively correlated with starch content;the starch content is positively correlated with nut size and dry weight but negatively correlated with volume kernel yield.(3)Regression models are constructed based on the correlations between nut phenotypic traits and kernel qualities.There is a linear relationship between oil content and kernel yield,a parabolic relationship between soluble sugar content and volume kernel percentage,a linear relationship between starch content and nut volume,and a linear relationship between protein content and geometric average diameter.The models are validated by model fitting,with the difference between the predicted and actual values within the 95％limits of agreement(LOA)accounting for more than 95％of the total,demonstrating the models'reasonableness and reliability.[Conclusion]Reliable regression models are constructed based on the close relationship between nut phenotypic traits and kernel qualities.These models can preliminarily distinguish nut quality and are helpful for the initial screening of suitable cultivars or strains.关键词
胡桃(核桃)/表型性状/内在品质/品种(系)筛选/模型拟合Key words
Juglans regia/phenotypic trait/kernel quality/screening of cultivars or strain/model fitting分类
农业科技引用本文复制引用
李洋,张赟齐,温玥,张绥林,陈永浩,齐建勋,张俊佩,侯智霞..早实核桃坚果表型和内在品质的关联分析及模型构建[J].南京林业大学学报（自然科学版）,2025,49(1):119-127,9.基金项目
国家重点研发计划(2022YFD2200402) （2022YFD2200402）
北京市农林科学院科技创新能力建设专项(KJCX20230118) （KJCX20230118）
北京市林业果树研究所青年基金(LGYJJ202103). （LGYJJ202103）
