Amino acid transporter CsAAP1 for enhanced nutrient uptake in tea plants

Overview

This research focuses on the amino acid transporter CsAAP1 in tea plants (Camellia sinensis L.) and its role in absorbing amino acids from soil into roots. Preliminary findings indicate that CsAAP1 is predominantly expressed in root tissue, and tea varieties with higher CsAAP1 transcription levels show greater amino acid uptake capacity. The work targets a fundamental mechanism of plant nitrogen nutrition with direct implications for tea cultivation quality and yield.

Technical specifications

• Gene of interest: CsAAP1, an amino acid transporter gene primarily expressed in tea plant roots
• Hypothesis basis: Correlation observed between CsAAP1 transcription levels and amino acid uptake efficiency across tea varieties
• Validation procedure: Heterologous expression of CsAAP1 in the yeast mutant strain 22Δ10α, which lacks endogenous amino acid absorption capacity and cannot grow on medium with amino acids as the sole nitrogen source; expression of CsAAP1 restored normal growth
• Future validation plan: Suppression of CsAAP1 expression in tea plant roots using gene-specific antisense oligodeoxynucleotides (AsODN), followed by treatment with amino acid isotope tracers to quantify uptake; sense oligodeoxynucleotides (sODN) will serve as the control
• Timeline: Approximately one year for completion of isotope-based validation

Technology readiness level

The research is at an early discovery stage. The CsAAP1 transporter function has been confirmed through yeast complementation, providing initial proof of amino acid transport activity. The next phase involves isotope tracing in living tea plants to validate the transporter's role in soil-to-root amino acid uptake. The team is seeking partnership support for purchasing amino acid isotopes, accessing isotope detection equipment, and funding key personnel to advance validation.