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Plant and Soil

, Volume 434, Issue 1–2, pp 125–137 | Cite as

Competition between Zea mays genotypes with different root morphological and physiological traits is dependent on phosphorus forms and supply patterns

  • Hongbo Li
  • Deshan Zhang
  • Xinxin Wang
  • Haigang Li
  • Zed Rengel
  • Jianbo ShenEmail author
Regular Article

Abstract

Background and aims

Each genotype within species has a particular combination of root morphological and/or physiological traits to adapt to phosphorus-limited environments, which can lead to its unique plant fitness and competitive ability. Yet, how the various phosphorus environments affect the competition between genotypes remains obscure.

Methods

Two maize (Zea mays L.) genotypes (XY335 and HMY, bred in nutrient-rich and nutrient-poor environments, respectively) were grown in monoculture and mixture in phosphorus-limited soil with homogeneous or heterogeneous supply patterns and inorganic (Pinorg) or organic phosphorus (Porg) forms.

Results

In homogeneous Pinorg and Porg environments, XY335 had higher root length and surface area, but lower mycorrhizal colonization and the acid phosphatase and phytase activities in the rhizosphere, than HMY. In heterogeneous phosphorus environments, XY335 had higher root proliferation than HMY. The root trait divergence influenced the competition in mixture: XY335 had a competitive advantage compared to HMY under heterogeneous phosphorus conditions, whereas HMY exhibited a stronger competitive ability in homogeneous phosphorus treatments; these reverse trends were more significant in the Porg than Pinorg treatments.

Conclusions

The results suggested the importance of root physiological traits in homogeneous phosphorus-limited soil environments, whereas P acquisition strategy based on root morphological traits favours heterogeneous phosphorus supply.

Keywords

Nutrient patch Foraging strategy Root trait Mycorrhizal colonization Rhizosphere properties Plant interaction Genetic diversity 

Notes

Acknowledgements

This study was supported by the National Natural Science Foundation of China (31772402, 31330070), National Key Research and Development Program of China (2016YFE0101100, 2017YFD0200200) and the Innovative Group Grant of the National Science Foundation of China (31421092). ZR is supported by Australian Research Council (DP160104434).

Supplementary material

11104_2018_3616_MOESM1_ESM.docx (67 kb)
ESM 1 (DOCX 67 kb)

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Copyright information

© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  1. 1.College of Resources and Environmental Sciences, Center for Resources, Environment and Food Security, Key Laboratory of Plant-Soil Interactions, Ministry of EducationChina Agricultural UniversityBeijingPeople’s Republic of China
  2. 2.Shanghai Academy of Agricultural Sciences No. 1000Eco-Environmental Protection Research InstituteShanghaiChina
  3. 3.Mountain Area Research InstituteAgricultural University of HebeiBaodingChina
  4. 4.Soil Science and Plant Nutrition, UWA School of Agriculture and EnvironmentThe University of Western AustraliaPerthAustralia

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