醋栗番茄渐渗系农艺性状综合评价及优异种质筛选OA

Using cultivated tomato'Taikonghongzuan'(Solanum lycopersicum)as the female parent and wild tomato'LA1598'(Solanum pimpinellifolium)as the male parent,a BC2F1 introgression line(IL)population was constructed through hybridization and backcrossing.This study employed multivariate statistical methods to comprehensively evaluate 53 agronomic traits across 19 ILs within this population,aiming to identify novel germplasms with superior comprehensive characteristics as well as accessions exhibiting outstanding or specific traits.The results showed that the coefficients of variation of 53 agronomic traits in the 19 ILs ranged from 0 to 94.87%,indicating rich genetic diversity.Correlation analysis demonstrated complex interrelationships among traits.Cluster analysis classified the 19 ILs into four clusters,with Cluster III exhibiting outstanding comprehensive traits including large single-fruit weight,high firmness,high soluble solids content,and high yield;Principal component analysis achieved comprehensive ranking of the lines,providing theoretical foundation for preliminary application of the introgression lines;Screening of BC2F1 population for specific traits yielded novel germplasms with outstanding characteristics in flower number per inflorescence(2 lines),fruit number per inflorescence(3 lines),firmness(5 lines),and flesh thickness(1 line),as well as specific characteristics in fruit stalk length(4 lines),ripening fruit color(4 lines),and number of ventricles(1 line).This study supplies valuable germplasm resources for tomato breeding and the exploration of genes underlying elite traits.