摘要
为选育油茶春花优良品种,以油茶杂交子代(YZ2×DY2)及亲本[母本(YZ2)、父本(DY2)]为研究对象,调查测定其花期和花器官性状,对花期性状进行分级,并对 9 个性状(花横径、花纵径、花柱裂数、雌蕊长、雄蕊长、花瓣数、花药数、盛花期相对时间、开花持续时间)进行变异、相关性、主成分、聚类分析.将盛花期相对时间和开花持续时间进行等距分级,筛选出符合良种选育目标的花期类型(95 株)和极长持续期类型(43 株).9 个性状变异系数为 9.75％～35.74％,其中,盛花期相对时间的变异系数最大,花柱裂数的变异系数最小.9个性状的中亲优势率范围为-23.17％～0.84％,除盛花期相对时间外均为负值,所有性状均出现超低亲和超高亲个体.杂交子代群体花药数与其他花器性状之间开放科学标识码(OSID码)均呈极显著正相关(P<0.01);盛花期相对时间与花横径、花纵径、雌蕊长、花瓣数、开花持续时间呈极显著相关(P<0.01),与花柱裂数呈显著相关(P<0.05).根据聚类分析将杂交子代群体分为 3 个类群:Ⅰ类属于最早花期长花期型:Ⅱ类属于最晚花期短花期型:Ⅲ类属于中花期型.
Abstract
In this study,we aim to provide a scientific basis for breeding superior varieties of Camellia oleifera by conducting multivariate statistical analysis on the flowering period and floral organ traits of this plant.The flowering stage and floral organ traits of the hybrid offspring of C.oleifera(YZ2×DY2)and their parents[female parent(YZ2),male parent(DY2)]were investigated and measured.The flowering stage traits were graded,with nine traits(floral transverse diameter,floral longitudinal diameter,number of style divisions,pistil length,length of stamen group,number of petals,number of anthers,relative days of full flowering,blooming duration)being analyzed based on variation,correlation,principal component,and cluster analyses.The relative days of the blooming stage and blooming duration were graded equidistantly,and the flowering period types(95 strains)and the types of very long duration(43 strains)were selected to meet the objectives of breeding superior varieties.The variation coefficients of the nine traits ranged from 9.75％to 35.74％,among which,the coefficient of variation of the relative days of the blooming stage was the largest,and that of the number of style divisions was the smallest.The mid-parent dominance rates of floral-related traits ranged from-23.17％to 0.84％,which were all negative,except for the relative days of the blooming stage.For all traits,we detected ultra-low-affinity and ultra-high-affinity individuals,and there was a highly significant positive correlation between anther number and other floral traits(P<0.01);the relative days of the blooming stage were significantly correlated with transverse diameter,longitudinal diameter,pistil length,petal number,and blooming duration(P<0.01),and were significantly correlated with the number of style divisions(P<0.05).According to cluster analysis,the hybrid progeny population could be divided into three groups,class Ⅰ corresponding to the earliest and longest flowering periods,class Ⅱ corresponding to the latest and shortest flowering periods,and class Ⅲ corresponding to the mid-flowering period.
基金项目
湖南省创新型省份建设专项(2021NK1007)
长沙市"揭榜挂帅"重大科技专项(Kq2102007)
湖南省科技创新计划资助()
青年科技人才项目(2022RC1152)
维普
万方数据