Nutrient deficiency effects on root architecture and root-to-shoot ratio in arable crops

Gina Lopez, Seyed Hamid Ahmadi, Wulf Amelung, Miriam Athmann, Frank Ewert, Thomas Gaiser, Martina I. Gocke, Timo Kautz, Johannes Postma, Shimon Rachmilevitch, Gabriel Schaaf, Andrea Schnepf, Alixandrine Stoschus, Michelle Watt, Peng Yu, Sabine Julia Seidel

Research output: Contribution to journalReview articlepeer-review

34 Scopus citations

Abstract

Plant root traits play a crucial role in resource acquisition and crop performance when soil nutrient availability is low. However, the respective trait responses are complex, particularly at the field scale, and poorly understood due to difficulties in root phenotyping monitoring, inaccurate sampling, and environmental conditions. Here, we conducted a systematic review and meta-analysis of 50 field studies to identify the effects of nitrogen (N), phosphorous (P), or potassium (K) deficiencies on the root systems of common crops. Root length and biomass were generally reduced, while root length per shoot biomass was enhanced under N and P deficiency. Root length decreased by 9% under N deficiency and by 14% under P deficiency, while root biomass was reduced by 7% in N-deficient and by 25% in P-deficient soils. Root length per shoot biomass increased by 33% in N deficient and 51% in P deficient soils. The root-to-shoot ratio was often enhanced (44%) under N-poor conditions, but no consistent response of the root-to-shoot ratio to P-deficiency was found. Only a few K-deficiency studies suited our approach and, in those cases, no differences in morphological traits were reported. We encountered the following drawbacks when performing this analysis: limited number of root traits investigated at field scale, differences in the timing and severity of nutrient deficiencies, missing data (e.g., soil nutrient status and time of stress), and the impact of other conditions in the field. Nevertheless, our analysis indicates that, in general, nutrient deficiencies increased the root-length-to-shoot-biomass ratios of crops, with impacts decreasing in the order deficient P > deficient N > deficient K. Our review resolved inconsistencies that were often found in the individual field experiments, and led to a better understanding of the physiological mechanisms underlying root plasticity in fields with low nutrient availability.

Original languageEnglish
Article number1067498
JournalFrontiers in Plant Science
Volume13
DOIs
StatePublished - 4 Jan 2023

Keywords

  • fertilizer
  • nitrogen
  • nutrient limitation
  • phosphorous
  • potassium
  • root morphology
  • root plasticity

ASJC Scopus subject areas

  • Plant Science

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