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Dissecting genetic variation and association mapping for agro-morphological traits under high temperature stress in pea (Pisum sativum L.)

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Abstract

High temperature stress is a severe problem that limits the productivity of pea and most crops. Investigating the genetic basis of agronomic and morphological traits related to heat stress tolerance could expedite the development of stress-adaptive pea cultivars, thereby increasing productivity for food security. This study aimed to explore genetic variation in Southeast Asia pea accessions and identify marker-trait associations (MTAs) related to heat stress. Phenotypic data were assessed for genetic variation in 11 traits including phenological, morphological, and agronomic, under high temperature conditions in Malaysia and Indonesia. A collection of 94 pea accessions of 92 landraces from Indonesia and two commercial cultivars from Taiwan was used for genome-wide association study. A total of 1,974 high-quality single nucleotide polymorphisms (SNPs) were used to determine marker-trait associations. Population structure, principal coordinate analysis, and kinship analysis revealed that the accessions could be divided into three groups. The BLINK model identified twenty-six significant (P ≤ 0.001) MTAs for the observed characters across all locations and consistent in multiple individual locations. Two SNPs on Chr2 and Chr6 that were associated with more than one trait predicted to co-localize with a gene involved in mediating environmental stress responses and may provide a novel mechanism of heat tolerance in pea. Nineteen candidate genes were identified within 15 kb distance of 26 significant SNPs associated with days to flowering, number of nodes, peduncle length, days to harvesting green pod, days to physiological maturity, and seed volume. The SNP markers and candidate genes identified in this study have potential for marker-assisted selection toward rapid development of pea cultivars with improved heat tolerance.

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The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

We thank Carmen Breitkreutz, Pulse Crop Breeding staff of the Crop Development Centre, University of Saskatchewan, for her technical assistance during the laboratory work.

Funding

This work was sponsored by DAAD (The German Academic Exchange Service) under In-Country/In-Region scholarship program at SEAMEO SEARCA, 2019 (Grant Number 57454966). This work was also supported by Canadian Bureau for International Education under Canada-ASEAN Scholarships and Educational Exchanges for Development.

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All authors contributed to the study conception and design. Phenotyping, data analysis, and initial draft writing of the manuscript were done by C.U.Z. Plant material was provided by B.W. Genotyping was managed by K.K.G. and T.D.W. T.D.W., K.K.G., S.I.R., and B.W. reviewed and edited the manuscript. All authors approved the final version of this manuscript.

Corresponding author

Correspondence to Shairul Izan Ramlee.

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The authors declare no competing interests.

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Zanetta, C.U., Gali, K.K., Rafii, M.Y. et al. Dissecting genetic variation and association mapping for agro-morphological traits under high temperature stress in pea (Pisum sativum L.). Euphytica 220, 23 (2024). https://doi.org/10.1007/s10681-023-03279-x

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  • DOI: https://doi.org/10.1007/s10681-023-03279-x

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