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Identification of Candidate Expansin Genes Associated with Seed Weight in Pomegranate (Punica granatum L.)

文献类型： 外文期刊

作者： Liu, Chunyan 1 ; Zhao, Haoyu 1 ; Li, Jiyu 1 ; Cao, Zhen 1 ; Deng, Bo 3 ; Liu, Xin 1 ; Qin, Gaihua 1 ;

作者机构： 1.Anhui Acad Agr Sci, Inst Hort, Key Lab Hort Crop Germplasma Innovat & Utilisat C, Hefei 230031, Peoples R China

2.Anhui Acad Agr Sci, Inst Hort, Key Lab Genet Improvement & Ecophysiol Hort Crops, Hefei 230031, Peoples R China

3.Anhui Agr Univ, Sch Forestry & Landscape Architecture, Hefei 230036, Peoples R China

关键词： pomegranate; expansin; seed weight; marker; association analysis

期刊名称：GENES （ 影响因子：3.5； 五年影响因子：3.9 ）

ISSN：

年卷期： 2024 年 15 卷 2 期

页码：

收录情况： SCI

摘要： Seed weight is an important target trait in pomegranate breeding and culture. Expansins act by loosening plant cell walls and cellulosic materials, permitting turgor-driven cell enlargement. However, the role of expansin genes (EXPs) in pomegranate seed weight remains elusive. A total of 29 PgrEXPs were identified in the 'Dabenzi' genome. These genes were classified into four subfamilies and 14 subgroups, including 22 PgrEXPAs, 5 PgrEXPBs, 1 PgrEXPLA, and 1 PgrEXPLB. Transcriptome analysis of PgrEXPs in different tissues (root, leaf, flower, peel, and seed testa) in 'Dabenzi', and the seed testa of the hard-seeded pomegranate cultivar 'Dabenzi' and soft-seeded cultivar 'Tunisia' at three development stages showed that three PgrEXPs (PgrEXPA11, PgrEXPA22, PgrEXPA6) were highly expressed throughout seed development, especially in the sarcotesta. SNP/Indel markers of these PgrEXPs were developed and used to genotype 101 pomegranate accessions. The association of polymorphic PgrEXPs with seed weight-related traits (100-seed weight, 100-kernel weight, 100-sarcotesta weight, and the percentage of 100-sarcotesta to 100-seed weight) were analyzed. PgrEXP22 was significantly associated with 100-seed weight and 100-sarcotesta weight and is a likely candidate for regulating seed weight and sarcotesta development in particular. This study provides an effective tool for the genetic improvement of seed weight in pomegranate breeding programs.

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