Abstract
Aims
Plants can optimize the allocation of phosphorus (P) among their foliar P fractions to increase the P utilization efficiency (PUE). Identifying the genetic relationships between foliar P fractionation and PUE could provide opportunities to improve the P efficiency of barley (Hordeum vulgare L.).
Methods
The differences in the concentrations and proportions of inorganic P, ester P, nucleic acid P and insoluble P between a wild barley cultivar CN4027 and a commercial cultivar Baudin were studied, and their quantitative trait loci (QTLs) at normal P (NP) and low P (LP) fertilisations were mapped. The PUE that was determined in the previous study was used to analyze the relationship between PUE and foliar P fractionation in this research.
Results
Both cultivars of barley could increase their metabolic P fractions as an LP stress tolerance strategy to ensure their continued metabolic activities in response to LP stress. Cultivar CN4027 showed higher nucleic acid P concentration (NPC), nucleic acid P proportion (NPP) and insoluble P proportion (IPP) than cultivar Baudin under LP stress. This abundant organic P (Po) pool of CN4027 ensured the normal functioning of its metabolic pathways under LP stress. The close relationships between the foliar P fractionation and PUE could be explained by two QTL clusters, Cl-3H.02 and Cl-5H.01. The QTL cluster Cl-3H.02 is flanked by the markers bPb3256099-bPb3255630 on chromosome 3H and controls the ester P concentration (EPC), ester P proportion (EPP), insoluble P concentration (IPC) and IPP.
Conclusions
The QTL cluster Cl-3H.02 might have great potential for the future genetic improvement of barley PUE and may offer clues for the genetic relationships between the foliar P fractionation and PUE.
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Abbreviations
- P:
-
phosphorus
- PUE:
-
phosphorus utilization efficiency
- LP:
-
low P
- NP:
-
normal P
- QTL:
-
quantitative trait loci
- MAS:
-
marker-assisted selection
- RILs:
-
recombinant inbred lines
- PAE:
-
P acquisition efficiency
- Pi:
-
inorganic P
- Po:
-
organic P
- PiC:
-
inorganic P concentration
- EPC:
-
ester P concentration
- NPC:
-
nucleic acid P concentration
- IPC:
-
insoluble P concentration
- PiP:
-
inorganic P proportion
- EPP:
-
ester P proportion
- NPP:
-
nucleic acid P proportion
- IPP:
-
insoluble P proportion.
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Acknowledgements
This work was supported by the National Natural Science Foundation (31401377), Science and Technology Project of Sichuan Province (2014NZ0008; 2017JY0126) and Key Project of Education Department of Sichuan Province (14ZA0002).
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Highlights
• The wild barley cultivar CN4027 showed a stronger organic P pool to improve P utilization efficiency (PUE) than the commercial barley cultivar Baudin.
• The relationships between foliar P fractionations and PUE could be explained by the coincidence of quantitative trait loci (QTLs) for these traits.
• The QTL cluster Cl-3H.02 could have great potential for future genetic improvement of P efficiency in barley.
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Guo, J., Ye, D., Chen, G. et al. Coincidence of QTLs determining foliar phosphorus fractionation patterns and phosphorus utilization efficiency in barley under low phosphorus stress. Plant Soil 441, 349–362 (2019). https://doi.org/10.1007/s11104-019-04128-4
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DOI: https://doi.org/10.1007/s11104-019-04128-4