水产学报2025，Vol.49Issue(8)：109-120,12.DOI:10.11964/jfc.20250114844
不同纬度厚壳贻贝野生群体间的遗传多样性与足丝表型差异
Differentiation of genetic diversity and byssal pheno-type among wild populations of Mytilus coruscus loc-ated at different latitudes
摘要
Abstract
The mussel is one of the main cultivated species in the world.A significant challenge faced by suspension-cultured mussels is the high incidence of mussel fall-off from cultivation ropes,adversely impacting harvest yields,which have been documented at commercial mussel farms in the United Kingdom,the United States of America,Canada,Spain,New Zealand and China.Byssus is an important attachment structure for marine mussels,and weakness in byssal thread attachment is a major factor leading to mussel detachment from ropes.To investigate the relationship between genetic variability and byssal thread phenotypic characteristics in the hard-shelled mussel(Mytilus coruscus),we collected three wild populations of M.coruscus from different latitudes in the East China Sea,including the Shengsi(SS),Jiaojiang(JJ),and Fuding(FD)popula-tions.The genetic diversity and structure of these populations were investigated using 10 microsatellite loci.The mean observed heterozygosity(Ho)in the SS population was 0.44,higher than the mean Ho values of the JJ(0.40)and FD(0.39)populations.The mean inbreeding coefficients(Fis)in the SS population was 0.20,lower than the mean Fis val-ues of the JJ(0.33)and FD populations(0.40).These results revealed that the SS popula-tion exhibited higher genetic diversity compared to the other two populations.The differ-ent numbers of private alleles(Pa)in the three populations,ranging from 10 to 17,sug-gest that these populations have experienced selective pressures from various environ-ments.Moreover,genetic differentiation was observed in the genetic distance between the SS population and the other two populations.We also examined the phenotypic character-istics of their byssal threads.There were significant differences in byssus attachment strength among the three populations,with the SS population located at the highest latit-ude secreting more byssal threads and exhibiting greater byssal breaking force and plaque adhesion strength,while the Fuding(FD)population located at the lowest latitude had the weakest byssal attachment.The observed differentiation in private alleles and byssus phenotypes might suggest that the three wild populations have experienced different environmental selective pressures.This study provides insight for future genetic enhancement programs aimed at improving byssus attachment in M.coruscus.关键词
厚壳贻贝/微卫星/遗传多样性/遗传结构/足丝表型Key words
Mytilus coruscus/microsatellite/genetic diversity/genetic structure/byssal phenotype分类
生物科学引用本文复制引用
林悦彤,王雨晴,倪纪越,李一峰,卢霞..不同纬度厚壳贻贝野生群体间的遗传多样性与足丝表型差异[J].水产学报,2025,49(8):109-120,12.基金项目
国家重点研发计划(2022YFD2401700) （2022YFD2401700）
国家自然科学基金(32172992) National Key Research and Development Program of China(2022YFD2401700) （32172992）
National Natural Science Foundation of China(32172992) （32172992）
