A major quantitative trait locus controlling phosphorus utilization efficiency under different phytate-P conditions at vegetative stage in barley

摘要

cqvip:Organic phosphorus(P) is an important component of the soil P pool, and it has been proven to be a potential source of P for plants. The phosphorus utilization efficiency(PUE) and PUE related traits(tiller number(TN), shoot dry weight(DW), and root dry weight) under different phytate-P conditions(low phytate-P, 0.05 mmol L^(–1) and normal phytate-P, 0.5 mmol L^(–1)) were investigated using a population consisting of 128 recombinant inbred lines(RILs) at the vegetative stage in barley. The population was derived from a cross between a P-inefficient genotype(Baudin) and a P-efficient genotype(CN4027, a Hordeum spontaneum accession). A major locus(designated Qpue.sau-3 H) conferring PUE was detected in shoots and roots from the RIL population. The quantitative trait locus(QTL) was mapped on chromosome 3 H and the allele from CN4027 confers high PUE. This locus explained up to 30.3 and 28.4% of the phenotypic variance in shoots under low and normal phytate-P conditions, respectively. It also explains 28.3 and 30.7% of the phenotypic variation in root under the low and normal phytate-P conditions, respectively. Results from this study also showed that TN was not correlated with PUE, and a QTL controlling TN was detected on chromosome 5 H. However, dry weight(DW) was significantly and positively correlated with PUE, and a QTL controlling DW was detected near the Qpue.sau-3 H locus. Based on a covariance analysis, existing data indicated that, although DW may affect PUE, different genes at this locus are likely involved in controlling these two traits.