Abstract
Phosphorus is one of the most important nutrients required for plant growth and development. While substantial amounts of total phosphorus are present in many soil types, plants are unable to utilize some organic phosphorus sources. The main goal of this study was to characterize the spectrum of secreted plant proteins, organic acids and other metabolites that can potentially contribute to utilization of various phosphorus compounds. Our data indicate that the composition of extracellular proteins secreted by plant roots varies depending on the specific source of P in the growth medium. Furthermore, some root-secreted metabolites, such as citrate, appear to be specific to a subset of ecotypes, while tartrate, succinate and oxalate are secreted by a number of A. thaliana ecotypes. We observed secretion of phenolic compounds, such as tannins, and deoxycytidine derivatives. Taken together, while no single secreted polypeptide, organic acid or secondary metabolite can be pinpointed as specific to plant growth in particular phosphorus conditions, our data indicate that A. thaliana ecotypes differ in their physiological responses to the source of phosphorus in the growth medium. Overall, these results suggest that physiological changes in plant responses to nutrient limitation are modulated by interactions between soil phosphorus source and the specific genotype of Arabidopsis plants.
Highlights
Phosphorus is one of the most important inorganic nutrients necessary for plant growth, development and physiology
While no single secreted polypeptide, organic acid or secondary metabolite can be pinpointed as specific to plant growth in particular phosphorus conditions, our data indicate that A. thaliana ecotypes differ in their physiological responses to the source of phosphorus in the growth medium
To study protein secretion by the roots of plants grown in conditions of phosphorus deficiency, we initially chose the Mt-0 ecotype of A. thaliana
Summary
Phosphorus is one of the most important inorganic nutrients necessary for plant growth, development and physiology. While many soil types harbor substantial amounts of phosphorus-containing molecules, many of these compounds are characterized by low solubility or undergo rapid conversion to insoluble forms [1]. An important aspect of modern plant science is to improve agricultural productivity in an environmentally friendly and cost-effective fashion, especially when plants are grown on phosphorus-deficient soils. Such agricultural approaches may include strategies to increase bioavailability of insoluble forms of soil phosphorus. Towards this goal, understanding mechanisms of how plants acquire and respond to various forms of phosphorus from soils may prove to be important
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