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2009

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cc-by-nc (c) Caldelas Molina, Cristina et al., 2009
Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/125840

Physiological responses of Eichhornia crassipes [Mart.] Solms to the combined exposure to excess nutrients and Hg

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https://doi.org/10.1590/S1677-04202009000100002

Abstract

Population structure and genome-wide linkage disequilibrium (LD) were investigated in 192 Hordeum vulgare accessions providing a comprehensive coverage of past and present barley breeding in the Mediterranean basin, using 50 nuclear microsatellite and 1,130 DArT markers. Both clustering and principal coordinate analyses clearly sub-divided the sample into five distinct groups centred on key ancestors and regions of origin of the germplasm. For given genetic distances, large variation in LD values was observed, ranging from closely linked markers completely at equilibrium to marker pairs at 50 cM separation still showing significant LD. Mean LD values across the whole population sample decayed below r2 of 0.15 after 3.2 cM. By assaying 1,130 genome-wide DArT markers, we demonstrated that, after accounting for population substructure, current genome coverage of 1 marker per 1.5 cM except for chromosome 4H with 1 marker per 3.62 cM is sufficient for whole genome association scans. We show, by identifying associations with powdery mildew that map in genomic regions known to have resistance loci, that associations can be detected in strongly stratified samples provided population structure is effectively controlled in the analysis. The population we describe is, therefore, shown to be a valuable resource, which can be used in basic and applied research in barley.

Subject

Efecte de l'estrès sobre les plantes, Fisiologia vegetal

Subject (English)

Effect of stress on plants, Plant physiology

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Articles publicats en revistes (Biologia Evolutiva, Ecologia i Ciències Ambientals)

Citation

CALDELAS, Cristina, et al. Physiological responses of Eichhornia crassipes [Mart.] Solms to the combined exposure to excess nutrients and Hg. Brazilian Journal of Plant Physiology. 2009. Vol. 21, num. 1, pags. 1-12. ISSN 1677-9452. [consulted: 11 of June of 2026]. Available at: https://hdl.handle.net/2445/125840

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