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Elucidation of the GAUT gene family in eight Rosaceae species and function analysis of PbrGAUT22 in pear pollen tube growth

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Abstract

Main conclusion

The phylogenetic relationship and evolutionary history of the GAUT gene family were identified in 8 Rosaseae species. PbrGAUT22 was involved in controlling pollen tube growth by regulating the content of pectins.

Abstract

In plants, galacturonosyltransferases (GAUTs) were involved in homogalacturonan biosynthesis and functioned in maintaining pollen tube cell wall integrity. However, the feature and evolutionary history of the GAUT gene family in Rosaceae species and candidates in pear pollen tube growth remain unclear. Here, we identified 190 GAUT genes in 8 Rosaceae species, including Chinese white pear (Pyrus bretschneideri), European pear (Pyrus communis), apple (Malus × domestica), peach (Prunus persica), Japanese apricot (Prunus mume), sweet cherry (Prunus avium), woodland strawberry (Fragaria vesca) and black raspberry (Rubus occidentalis). Members in GAUT gene family were divided into 4 subfamilies according to the phylogenetic and structural analysis. Whole-genome duplication events and dispersed duplicates drove the expansion of the GAUT gene family. Among 23 pollen-expressed PbrGAUT genes in pear, PbrGAUT22 showed increased expression level during 1–6 h post-cultured pollen tubes. PbrGAUT22 was localized to the cytoplasm and plasma membrane. Knockdown of PbrGAUT22 expression in pollen tubes caused the decrease of pectin content and inhibited pear pollen tubes growth. Taken together, we investigated the identification and evolution of the GAUT gene family in Rosaceae species, and found that PbrGAUT22 played an essential role in the synthesis of pectin and the growth of pear pollen tubes.

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Data availability

The data that support the findings of this study are available from the corresponding author upon request.

Abbreviations

CW:

Cell wall

DSD:

Dispersed duplicates

GATL:

Galacturonosyltransferase-like

GAUT:

Galacturonosyltransferase

HG:

Homogalacturonan

HPC:

Hours post-culture

WGD:

Whole-genome duplication

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Acknowledgements

This work was supported by Jiangsu Agricultural Science and Technology Innovation Fund (CX(22)3044), the Fundamental Research Funds for the Central Universities Priority (KYQN2022047), the National Natural Science Foundation of China (32172543, 32102358), Natural Science Foundation of Jiangsu Province (BK20210394), the Earmarked Fund for China Agriculture Research System (CARS-28), Hainan Yazhou Bay Seed Lab Project (B22E11002) and Academic Program Development of Jiangsu Higher Education Institutions. The bioinformatics analysis was supported by the Bioinformatics Center of Nanjing Agricultural University.

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  1. Yiling Cai and Chao Tang have contributed equally.

Authors and Affiliations

  1. State Key Laboratory of Crop Genetics and Germplasm Enhancement, Sanya Institute of Nanjing Agricultural University, Nanjing Agricultural University, Nanjing, 210095, China

    Yiling Cai, Chao Tang, Shouzheng Lv, Qiming Chen, Xiaoxuan Zhu, Xian Li, Kaijie Qi, Zhihua Xie, Shaoling Zhang, Peng Wang & Juyou Wu

  2. Jiangsu Key Laboratory for Horticultural Crop Genetic Improvement, Nanjing, 210014, China

    Juyou Wu

  3. Hainan Yazhou Bay Seed Lab, Sanya, 572024, China

    Chao Tang

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Cai, Y., Tang, C., Lv, S. et al. Elucidation of the GAUT gene family in eight Rosaceae species and function analysis of PbrGAUT22 in pear pollen tube growth. Planta 257, 68 (2023). https://doi.org/10.1007/s00425-023-04103-5

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