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Title of Journal: Euphytica

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Abbravation: Euphytica

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Springer Netherlands

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DOI

10.1002/mcs.1220010202

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1573-5060

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Seed dormancy QTL identification across a Emphasi

Authors: Renata Cantoro Luis G Fernández Gerardo D L Cervigni María V Rodríguez Jorge O Gieco Norma Paniego Ruth A Heinz Roberto L BenechArnold
Publish Date: 2016/05/17
Volume: 211, Issue: 1, Pages: 41-56
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Abstract

Preharvest sprouting PHS in Sorghum bicolor is one of the main constrains for its production in the central region of Argentina as grain maturation often coincides with rainy or high environmental humidity conditions The obtention of more dormant genotypes with higher PHS resistance has always been a desirable trait for breeders but the typical quantitative nature of seed dormancy makes its manipulation difficult through classical breeding Dissecting this quantitative variability into quantitative trait loci QTL is a main concern especially in cereal species In this work a sorghum segregating population including 190 families was genotyped with microsatellite markers and the SbABI5 candidate gene A genetic map encompassing 96 markers and a total length of 1331 cM was built Seed dormancy was phenotyped in F3 and F4 panicles in two contrasting Argentinean environments Castelar and Manfredi Six seed dormancy QTL for mature grains were identified qGI1 qGI3 qGI4 qGI6 qGI7 and qGI9 with the aid of QTL Cartographer and QTLNetwork three of them qGI3 qGI7 and qGI9 being colocalised by both approaches No epistasis was detected for the identified QTL but QTLbyenvironment interaction was significant for qGI7 and qGI9 Interestingly seed dormancy candidate genes SbABI3/VP1 and SbGA20ox3 were located within qGI3 which makes them noteworthy candidate genes for this QTLThe authors would like to thank Verónica Lia and Andrea Puebla for their skilful assistance with SSR genotyping and Mirta Tinaro for her qualified technical help with dormancy phenotyping This work was supported by a grant from the National Agency for Science and Technological Promotion ANPCyT PICT 2010 no 2521 and INTA Project PNBIO 1131042 Renata Cantoro held a PhD grant from the Argentinean National Council of Scientific and Technical Research CONICET

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