QTL Analysis of Several Important Fruit Quality Traits in Litchi(Litchi chinensis Sonn.)

The four traits of fruit in litchi(Litchi chinensis),include tartaric content,malic acid content,sucrose content and single fruit weight,were evaluated from an F_1 population of 'Maguili' and 'Jiaohesanyuehong' which consisted of 76 individuals.The four traits showed continuous variation with the typical characteristic of quantitative traits.According to the constructed genetic linkage map,there were totally 23 QTLs linked the four traits,include 2 QTLs for tartaric content,4 QTLs for malic acid content,12 QTLs for sucrose content and 5 QTLs for single fruit weight,phenotypic variation explained by each QTL ranged from 13.85%to 88.3%,and its LOD value within 3.15-5.61.