Acta Agriculturae Zhejiangensis ›› 2026, Vol. 38 ›› Issue (3): 609-620.DOI: 10.3969/j.issn.1004-1524.20250224

• Review • Previous Articles    

Research progress on genetic map construction in fruit trees and QTL identification of major fruit quality traits

DU Chenfei1,2(), LI Wenjue1,2, WEI Chunyan2, CAI Danying2, WANG Yuezhi2, SHI Zebin2, DAI Meisong2,*(), GAO Yongbin1,*()   

  1. 1. College of Horticultural Science, Zhejiang A&F University, Hangzhou 311300, China
    2. Institute of Horticulture, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
  • Received:2025-03-19 Online:2026-03-25 Published:2026-04-17
  • Contact: DAI Meisong,GAO Yongbin

Abstract:

In breeding practice, traditional hybridization efficiency is constrained in major fruit crops such as apple, citrus, and pear due to their highly heterozygous genetic background, lengthy breeding cycles, and polygenic regulation of quantitative traits. In recent years, the construction of high-density genetic maps based on molecular markers and finemapping of quantitative trait loci (QTL) have become key approaches for unraveling the genetic mechanisms underlying key agronomic traits in fruit trees. Numerous genetic linkage maps have been developed worldwide, enabling the successfully mapping QTL associated with key quality traits including fruit size, shape, firmness, color, sugar-acid content, and aroma. Integrated multi-omics analyses have further revealed their molecular regulatory pathways. This review summarizes current progress in genetic mapping for fruit trees and QTL mapping achievements for major quality traits. Key findings indicate that optimized molecular marker techniques (SSR, SNP) have significantly enhanced genetic map resolution, while the “One-Ways-Pseudo-Testcross” and “Two-Ways-Pseudo-Testcross” theories have provided critical methodological frameworks for QTL analysis. Although QTLs related to major fruit quality traits have been identified in several fruit trees, their stability and cross-environment adaptability require further validation. Additionally, the synergistic genetic mechanisms of multiple traits and QTL-environment interactions remain poorly understood, limiting the precision of marker-assisted breeding. Future research should integrate high-throughput sequencing, multi-omics approaches, and machine learning to develop ultra-dense genetic maps, identify candidate genes, and establish theoretical foundations for efficient molecular design breeding in fruit trees.

Key words: fruit tree, linkage map, quality trait, QTL mapping

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