TITLE:
Arabidopsis thaliana Metabolites Secreted by Roots during Plant Growth in Phosphorus-Limiting Conditions
AUTHORS:
Liliia R. Abdulkina, Inna A. Аgabekian, Inna B. Chastukhina, Lia R. Valeeva, Yulia D. Romanova, Irina V. Khilyas, Margarita R. Sharipova, Eugene V. Shakirov
KEYWORDS:
Natural Variation, Ecotype, Root Exudates, P Deficiency, Secretion
JOURNAL NAME:
American Journal of Plant Sciences,
Vol.10 No.6,
June
21,
2019
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.