Logo image
Back
QTL Analysis of Root Architecture Traits and Low Phosphorus Tolerance in an Andean Bean Population
Journal article   Peer reviewed

QTL Analysis of Root Architecture Traits and Low Phosphorus Tolerance in an Andean Bean Population

Karen A. Cichy, Matthew W. Blair, Carlos H. Galeano Mendoza, Sieglinde S. Snapp and James D. Kelly
Crop science, Vol.49(1), pp.59-68
01/2009
DOI: https://doi.org/10.2135/cropsci2008.03.0142

Abstract

Tolerance to low P soils is a desirable trait in common bean (Phaseolus vulgaris L.) cultivars grown in acid‐weathered soils. Genetic variability in response to P‐deficient soils exists in the Andean gene pool. G19833, a low P–tolerant indeterminate Andean landrace, has been evaluated for quantitative trait loci (QTL) and tolerance to low P in combination with Mesoamerican parents. Our goal was to expand our understanding of phenotypic traits and QTL from G19833 expressed in an Andean background. An F5:7 recombinant inbred line (RIL) population developed from two Andean bean genotypes, G19833 and AND696, a determinate line susceptible to low P soils, was examined under low and high soil P levels in replicated field trials. Phosphorus uptake was reduced by 70% and yield by 60% in low P compared to high P treatments. A linkage map was developed with 11 linkage groups and a total length of 1105 cM. Quantitative trait loci for root growth, seed yield, seed P content, and P use efficiency colocalized near the fin gene on linkage group B1. Quantitative trait loci for root growth traits, seed yield, and P uptake colocalized on B11. Quantitative trait loci for root length density (cm cm−3) and root surface area (cm2) did not colocalize with QTL for P uptake. This study indicates that root traits did not play an important role in tolerance to low P soil in an Andean × Andean cross, contrary to previous results with the same P‐efficient Andean parent (G19833) crossed to a Mesoamerican bean genotype.

Metrics

1 Record Views

Details

Logo image