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Discovery and map** of two new rust resistance genes, R17 and R18, in sunflower using genoty** by sequencing

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Abstract

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Discovery of two rust resistance genes, R17 and R18, from the sunflower lines introduced from South Africa and genetic map** of them to sunflower chromosome 13.

Abstract

Rust, caused by the fungus Puccinia helianthi Schw., is one of the most serious diseases of sunflower in the world. The rapid changes that occur in the virulence characteristics of pathogen populations present a continuous threat to the effectiveness of existing rust-resistant hybrids. Thus, there is a continued need for the characterization of genetically diverse sources of rust resistance. In this study, we report to identify two new rust resistance genes, R17 and R18, from the sunflower lines, KP193 and KP199, introduced from South Africa. The inheritance of rust resistance was investigated in both lines using two map** populations developed by crossing the resistant plants selected from KP193 and KP199 with a common susceptible parent HA 89. The F2 populations were first genotyped using genoty** by sequencing for map** of the rust genes and further saturated with markers in the target region. Molecular map** positioned the two genes at the lower end of sunflower chromosome 13 within a large gene cluster. Two co-segregating SNP markers, SFW01497 and SFW08875, were distal to R17 at a 1.9 cM genetic distance, and a cluster of five co-segregating SNPs was proximal to R17 at 0.7 cM. R18 co-segregated with the SNP marker SFW04317 and was proximal to two cosegregating SNPs, SFW01497 and SFW05453, at 1.9 cM. These maps provide markers for stacking R17 or R18 with other broadly effective rust resistance genes to extend the durability of rust resistance. The relationship of the six rust resistance genes in the cluster was discussed.

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Acknowledgements

We would like to thank Angelia Hogness for technical assistance.

Funding

This project was supported by the USDA-ARS CRIS Project No. 3060-2100-043-00D and the USDA-AMS Specialty Crop Block Grant Programs No. AM200100XXXXG063. Mention of trade names or commercial products in this report is solely for the purpose of providing specific information and does not imply recommendation or endorsement by the US Department of Agriculture. The USDA is an equal opportunity provider and employer.

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Contributions

LLQ conceived and designed the experiments. LLQ, GJM, and XHL performed the experiments. LLQ and TZI analyzed data. LLQ wrote the paper. TZI, XHL, and GJM commented on the manuscript before submission.

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Correspondence to L. L. Qi.

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The authors declare that they have no conflict of interest.

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The experiments were performed in compliance with the current laws of the USA.

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Communicated by Volker Hahn.

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Qi, L.L., Talukder, Z.I., Ma, G.J. et al. Discovery and map** of two new rust resistance genes, R17 and R18, in sunflower using genoty** by sequencing. Theor Appl Genet 134, 2291–2301 (2021). https://doi.org/10.1007/s00122-021-03826-x

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  • DOI: https://doi.org/10.1007/s00122-021-03826-x

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