期刊
FRONTIERS IN PLANT SCIENCE
卷 7, 期 -, 页码 -出版社
FRONTIERS MEDIA SA
DOI: 10.3389/fpls.2016.01939
关键词
phosphorus uptake; fibrous root species; legume species; mot morphological traits; root exudation; phosphorus supply
资金
- National Natural Science Foundation of China (NSFC) [31330070, 31210103906, 30925024]
- National Basic Research Program [973-2015CB150405]
- Innovative Group Grant of the National Science Foundation of China [31421092]
- Program of Introducing International Advanced Agricultural Science and Technology of the Ministry of Agriculture of China [2011-G18]
- Australian Research Council [DP160104434]
- UK Biotechnology and Biological Sciences Research Council
- Biotechnology and Biological Sciences Research Council [BBS/E/C/00005204] Funding Source: researchfish
- BBSRC [BBS/E/C/00005204] Funding Source: UKRI
The relationship between root morphological and physiological responses to variable P supply in different plant species is poorly understood. We compared root morphological and physiological responses to P supply in seven crop species (Zea mays, Triticum aestivum, Brassica napus, Lupinus albus, Glycine max, Vicia faba, Cicer arietinum) treated with or without 100 mg P kg(-1) in two soils (acidic and calcareous). Phosphorus deficiency decreased root length more in fibrous root species (Zea mays, Triticum aestivum, Brassica napus) than legumes. Zea mays and Triticum aestivum had higher root/shoot biomass ratio and Brassica napus had higher specific root length compared to legumes, whereas legumes (except soybean) had higher carboxylate exudation than fibrous root species. Lupinus albus exhibited the highest P-acquisition efficiency due to high exudation of carboxylates and acid phosphatases. Lupinus albus and Cicer arietinum depended mostly on root exudation (i.e., physiological response) to enhance P acquisition, whereas Zea mays, Triticum aestivum and Brassica napus had higher root morphology dependence, with Glycine max and Vicia faba in between. Principal component analysis using six morphological and six physiological responses identified root size and diameter as the most important morphological traits, whereas important physiological responses included carboxylate exudation, and P-acquisition and P-utilization efficiency followed by rhizosphere soil pH and acid phosphatase activity. In conclusion, plant species can be grouped on the basis of their response to soil P being primarily via root architectural or exudation plasticity, suggesting a potential benefit of crop-specific root-trait-based management to cope with variable soil P supply in sustainable grain production.
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