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Phosphoproteomic Strategy for Profiling Osmotic Stress Signaling in Arabidopsis

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Published on: June 25, 2020

Organ-specific phosphorus-allocation patterns and transcript profiles linked to phosphorus efficiency in two

Tariq Aziz¹, Patrick M Finnegan, Hans Lambers

¹School of Plant Biology, The University of Western Australia, Perth, Western Australia, 6009, Australia; Institute of Soil and Environmental Sciences, University of Agriculture, Faisalabad, 38040, Pakistan.

Plant, Cell & Environment

|November 7, 2013

Summary

Wheat cultivars show distinct molecular strategies for phosphorus efficiency. Chinese 80-55 maintains higher phosphate levels and acquisition, adapting its metabolism for growth under low phosphorus conditions.

Keywords:

genetic variation glycolysis nutrients/other phosphate transport phosphocholine transcription and translation transcriptome

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Area of Science:

Plant Molecular Biology
Agricultural Science
Nutrient Use Efficiency

Background:

Genotypic variation in phosphorus (P) efficiency exists in wheat (Triticum aestivum L.).
Molecular mechanisms underlying P efficiency are not well understood.
Understanding these mechanisms is crucial for improving crop P uptake and utilization.

Purpose of the Study:

To elucidate the molecular mechanisms of phosphorus (P) efficiency in wheat.
To compare the P acquisition and allocation strategies of a highly P-efficient cultivar (Chinese 80-55) with a less-efficient one (Machete).
To investigate organ-specific gene expression related to P transport and metabolism.

Main Methods:

Comparative analysis of two wheat cultivars (Chinese 80-55 and Machete) under varying P availability.
Measurement of inorganic phosphate (Pi) concentrations in different organs.
Quantitative analysis of transcript levels for key genes involved in Pi transport (TaPHT1;2, TaPHT1;5, TaPHT1;8, TaPHT2;1), H+-ATPase (TaHa1), and metabolic pathways (TaGPho1).

Main Results:

Chinese 80-55 maintained higher Pi concentrations and acquisition compared to Machete.
Differential organ-specific expression of Pi transporters and TaHa1 was observed.
Enhanced de novo phospholipid biosynthesis in Pi-limited leaves and increased starch breakdown in stems of Chinese 80-55 were noted.
Suppression of glycolysis, transcriptional regulation, and ribosomal activity transcripts in fine roots of Chinese 80-55.

Conclusions:

Chinese 80-55 exhibits superior P efficiency through enhanced Pi homeostasis and acquisition.
Metabolic acclimation, including altered phospholipid biosynthesis and starch metabolism, contributes to P efficiency.
Significant differences in P allocation and metabolic adaptation exist between contrasting wheat cultivars, offering targets for breeding P-efficient crops.