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QTL Analysis of Root Architecture Traits and Low Phosphorus Tolerance in an Andean Bean Population
Author(s) -
Cichy Karen A.,
Blair Matthew W.,
Galeano Mendoza Carlos H.,
Snapp Sieglinde S.,
Kelly James D.
Publication year - 2009
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci2008.03.0142
Subject(s) - quantitative trait locus , biology , phaseolus , trait , population , genetic architecture , cultivar , genetic linkage , soil water , agronomy , horticulture , gene , genetics , ecology , computer science , demography , sociology , programming language
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 F 5:7 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 (cm 2 ) 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.