Abstract
Key message
Key QTLs were identified for P efficiency in barley. Phosphorus efficiency and grain yield can be improved simultaneously in breeding.
Abstract
An important breeding goal for many crop species is improved phosphorus (P) efficiency. As in many other crops, selection for P efficient barley varieties has been slow because of inconsistent definitions of P efficiency and unknown genetic controls of P efficiency. We used two criteria to assess P efficiency in a doubled haploid Commander/Fleet population: P responsiveness (estimated as the deviation from the regression of yield with added P against yield with no added P treatment) and PUE (relative yield). Phosphorus responsiveness, PUE and grain yield were phenotyped at 0 and 30 kg P/ha in five environments. Lines consistently responsive to 30 kg P/ha across environments had the highest yield at the two P rates, and P responsiveness showed significantly higher broad sense heritability than PUE in the materials we studied. Genotyping of the population was subjected to a 9,000 single nucleotide polymorphism array and quantitative trait loci (QTLs) for P responsiveness were mapped with yield at 30 kg P/ha, which are common QTLs for yield when P was not limiting growth. The largest QTL for P responsiveness was mapped to 7HL in 2 years. PUE varied from 31 to 124 % across environments and one of the QTLs for PUE was mapped with yield at 0 kg P/ha. Our results demonstrate P responsiveness and grain yield can be improved simultaneously under high-input agricultural systems, but breeding for high PUE varieties may need to explore landrace or wild barley germplasm for low P tolerant alleles.
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Abbreviations
- Ant:
-
Anthocyanin
- BIN:
-
Binning of redundant markers
- BIP:
-
QTL mapping in biparental populations
- BLUP:
-
Best linear unbiased estimators
- BOPA:
-
Barley oligonucleotide pooled array
- ERF:
-
Ethylene response factor
- ICIM-ADD:
-
The inclusive composite interval mapping with additive effects
- ICIM-EPI:
-
The inclusive composite interval mapping with epistatic effects
- LOD:
-
Logarithm of odds ratio
- MAP:
-
Linkage map construction in biparental populations
- MET:
-
QTL by environment interaction in biparental populations
- P:
-
Phosphorus
- P0:
-
Additional P fertiliser at 0 kg P/ha
- P30:
-
Additional P fertiliser at 30 kg P/ha
- PHYC:
-
Phytochrome C
- P responsiveness:
-
The deviation from the regression of yield from 30 against 0 kg P/ha
- PUE:
-
Relative yield, calculation based on grain yield of paired plots with 0 and 30 kg P/ha
- QTL:
-
Quantitative trait locus
- SNP:
-
Single nucleotide polymorphism
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Acknowledgments
This work was supported by the Grains Research and Development Corporation, Australia (Project No. UA00115). We are grateful to Dr Julian Taylor’s assistance with the design of the experiments and analysis of some of the data. The technical support from Mr Willie Shoobridge and Mr Andrew Ware is gratefully acknowledged. The authors sincerely thank Dr Timothy March for providing marker information of HvAP2_672 and HvPhyC and Professor Chengdao Li’s proofreading of the manuscripts. We sincerely thank the editor and anonymous reviewers for their constructive comments, which shaped our work for publication.
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The authors declare that they have no conflict of interest.
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The experiments comply with the current laws of Australia in which they were performed.
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Communicated by K. Smith.
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122_2016_2729_MOESM2_ESM.pptx
Fig. S1 Genetic linkage maps of the Commander/Fleet population. SNPs with first few letters underlined have not been mapped to the Barke/Morex population (PPTX 434 kb)
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Gong, X., Wheeler, R., Bovill, W.D. et al. QTL mapping of grain yield and phosphorus efficiency in barley in a Mediterranean-like environment. Theor Appl Genet 129, 1657–1672 (2016). https://doi.org/10.1007/s00122-016-2729-8
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DOI: https://doi.org/10.1007/s00122-016-2729-8