Phosphate Availability Alters Architecture and Causes Changes in Hormone Sensitivity in the Arabidopsis Root System

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ID: 306469
2002
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Abstract
Abstract The postembryonic developmental program of the plant root system is plastic and allows changes in root architecture to adapt to environmental conditions such as water and nutrient availability. Among essential nutrients, phosphorus (P) often limits plant productivity because of its low mobility in soil. Therefore, the architecture of the root system may determine the capacity of the plant to acquire this nutrient. We studied the effect of P availability on the development of the root system in Arabidopsis. We found that at P-limiting conditions (<50 μm), the Arabidopsis root system undergoes major architectural changes in terms of lateral root number, lateral root density, and primary root length. Treatment with auxins and auxin antagonists indicate that these changes are related to an increase in auxin sensitivity in the roots of P-deprived Arabidopsis seedlings. It was also found that the axr1-3, axr2-1, and axr4-1 Arabidopsis mutants have normal responses to low P availability conditions, whereas the iaa28-1mutant shows resistance to the stimulatory effects of low P on root hair and lateral root formation. Analysis of ethylene signaling mutants and treatments with 1-aminocyclopropane-1-carboxylic acid showed that ethylene does not promote lateral root formation under P deprivation. These results suggest that in Arabidopsis, auxin sensitivity may play a fundamental role in the modifications of root architecture by P availability.
Reference Key
openalex_W2053863296 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors José López‐Bucio, Esmeralda Hernández-Abreu, Lenin Sánchez-Calderón, Marı́a Fernanda Nieto-Jacobo, June Simpson, Luís Herrera‐Estrella
Journal Plant physiology and biochemistry : PPB
Year 2002
DOI
10.1104/pp.010934
URL
https://doi.org/10.1104/pp.010934
Keywords Keywords not found

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