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Dissecting the genetics of cold tolerance in maize

AuthorsRevilla Temiño, Pedro ; Álvarez-Iglesias, Lorena ; Qiang, Yi; Romay Álvarez, María Cinta ; Ordás López, Bernardo ; Malvar Pintos, Rosa Ana
Issue Date22-Mar-2018
PublisherMaize Genetics Conference
Citation60th Annual Maize Genetics Conference: P174, p. 153 (2018)
AbstractCold tolerance is a complex trait that limits adaptation of maize in temperate areas. The available literature shows that cold tolerance is regulated by large number of QTLs with small effects and weak consistence across genotypes. However, previous studies have involved a limited number of genotypes with narrow genetic diversity, and scarce genetic recombination mapping populations. We investigated the genetics underlying cold tolerance in a multi-parent advanced generation inter-cross (MAGIC) population genotyped using genotyping by sequencing (GBS) with near one million SNPs. This MAGIC population consisted on recombinant inbred lines (RILs) released from a synthetic population (EPS21) obtained from Spanish, Italian, and French flints, and two non-Reid Corn Belt inbred lines. A set of 406 RILs was evaluated in a growth chamber under cold and control conditions, as well as in the field at early and late sowing dates. Our results showed no evidence for any single large-effect quantitative trait loci (QTLs); however, a region on chromosome 2 had a dense concentration of significant QTLs for fluorescence (Fv/Fm) that were consistent in growth chamber and early field sowing. Besides, we identified numerous additional small-effect QTLs for cold tolerance-related traits in growth chamber (64 QTLs) and early field sowing (61 QTLs). The large number of markers involved, the small effects explained by each QTL, and the difficulties on collecting phenotypic data, encourage the implementation of genomic selection programs to improve cold tolerance in maize.
DescriptionPóster presentado en el Congreso celebrado en Saint-Malo, Francia, entre el 22 y el 25 de marzo de 2018.
Publisher version (URL)https://maizegdb.org/maize_meeting/2018/2018Book.pdf
Appears in Collections:(MBG) Comunicaciones congresos
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