Haplotype structure around Bru1 reveals a narrow genetic basis for brown rust resistance in modern sugarcane cultivars.

TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik
L CostetA D'Hont

Abstract

Modern sugarcane cultivars (Saccharum spp., 2n = 100-130) are high polyploid, aneuploid and of interspecific origin. A major gene (Bru1) conferring resistance to brown rust, caused by the fungus Puccinia melanocephala, has been identified in cultivar R570. We analyzed 380 modern cultivars and breeding materials covering the worldwide diversity with 22 molecular markers genetically linked to Bru1 in R570 within a 8.2 cM segment. Our results revealed a strong LD in the Bru1 region and strong associations between most of the markers and rust resistance. Two PCR markers, that flank the Bru1-bearing segment, were found completely associated with one another and only in resistant clones representing efficient molecular diagnostic for Bru1. On this basis, Bru1 was inferred in 86 % of the 194 resistant sugarcane accessions, revealing that it constitutes the main source of brown rust resistance in modern cultivars. Bru1 PCR diagnostic markers should be particularly useful to identify cultivars with potentially alternative sources of resistance to diversify the basis of brown rust resistance in breeding programs.

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Citations

Aug 3, 2013·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·M GouyL Costet
Jan 1, 1999·Trends in Pharmacological Sciences·A J TurnerO Valdenaire
Jun 4, 1999·Trends in Neurosciences·D M Fekete
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Sep 16, 2014·PloS One·Milton Yutaka NishiyamaGlaucia Mendes Souza
Jun 9, 2020·Critical Reviews in Biotechnology·Ramaswamy ManimekalaiMallikarjuna Kandalam
Aug 20, 2017·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Heng-Bo WangYun-Hai Lu
Jul 26, 2018·Physiology and Molecular Biology of Plants : an International Journal of Functional Plant Biology·Mohammad Suhail KhanRaman Kapur
Nov 20, 2020·Scientific Reports·Alexandre Hild AonoReginaldo Massanobu Kuroshu

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