Abstract
Phosphorus (P) deficiency in agricultural soil is a major constraint for crop production and increasing P acquisition efficiency (PAE) of plants is considered as one of the most cost-effective solutions for yield increase. The objective of this study was to detect quantitative trait loci (QTL) controlling (PAE) and P utilization efficiency (PUE) in barley under applied (+P) and non-applied P (−P) conditions. Based on the analysis of a recombinant inbred lines (RILs) population derived from a cross between a malting barley variety and a wild barley accession, 17 QTL controlling PAE, PUE and yield traits were detected. The phenotypic variation explained by each of these QTL ranges from 11.0 to 24.7%. Significant correlation was detected between most of P-related traits and yield traits. Five QTL clusters were identified on four different chromosomes (1H, 3H, 5H, and 7H). Two of the QTL clusters, located on chromosome 1H (for GPUP/PUP) and 7H (for SPUE/SPC), respectively, are novel. Fourteen genes located in the interval harboring the major QTL were identified as candidates associated with P efficiency. The stable QTL for PAE, PUE and yield-related traits could be important for breeding P-efficient barley varieties.
Highlights
Phosphorus (P) is one of the most important mineral nutrient elements for plant development and it plays an irreplaceable role in agricultural productions (Su et al, 2006; Wang and Yan, 2010; Noack et al, 2014)
An recombinant inbred lines (RILs) population consisting of 128 F7:9 lines derived from a cross between Baudin, a high yielding malting variety adjust to a longer season, higher rainfall cropping region and parts of the medium rainfall cropping region of Western Australia and a wild barley (H. spontaneum) accession, CN4027 was used in this study
At the same P condition, significant differences between parents were detected for grain yield (GY), straw yield (SY), and dry matter (DM)
Summary
Phosphorus (P) is one of the most important mineral nutrient elements for plant development and it plays an irreplaceable role in agricultural productions (Su et al, 2006; Wang and Yan, 2010; Noack et al, 2014). The application of P fertilizers is one of the most effective methods to alleviate soil P deficiency (Shen et al, 2011). Only 10–20% P could be absorbed in the year of application (Yang et al, 2011). It is widely believed that developing cultivars with high-efficiency P acquisition and utilization in P-deficient soils is one of the most economical and sustainable solutions in crop breeding programs worldwide (Yan et al, 2006; Liang et al, 2010)
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