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Drought-Induced Leaf Proteome Changes in Switchgrass Seedlings.

Zhujia Ye1, Sasikiran Sangireddy2, Ikenna Okekeogbu3

  • 1Department of Agricultural Sciences, Tennessee State University, 3500 John Merritt Blvd, Nashville, TN 37209, USA. zye@my.tnstate.edu.

International Journal of Molecular Sciences
|August 5, 2016
PubMed
Summary
This summary is machine-generated.

Switchgrass seedlings struggle with drought, but this study identified 257 proteins involved in drought response. These proteins offer targets for improving drought tolerance in young switchgrass plants.

Keywords:
ProteoMinerabscisic acid (ABA) signalingfunctional pathwaysisobaric tags for relative and absolute quantitation (iTRAQ)physiological properties“Sandwich” plant growth system

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Area of Science:

  • Plant Science
  • Proteomics
  • Drought Stress Physiology

Background:

  • Switchgrass (Panicum virgatum) is a deep-rooted perennial crop, generally drought-tolerant.
  • However, switchgrass seedlings are highly susceptible to drought during establishment.
  • Understanding molecular responses is crucial for improving seedling survival.

Purpose of the Study:

  • To investigate drought-induced proteome changes in switchgrass seedlings.
  • To identify proteins involved in drought stress response pathways.
  • To provide candidate proteins for enhancing seedling drought tolerance.

Main Methods:

  • Developed a "sandwich" system to simulate gradual drought stress over 20 days.
  • Utilized isobaric tags for relative and absolute quantitation (iTRAQ) and nano-scale liquid chromatography mass spectrometry (nano-LC-MS/MS) for quantitative proteomics.
  • Enriched low-abundance proteins to increase proteome coverage.

Main Results:

  • Identified 7006 leaf proteins, with 257 (4%) showing significant changes under drought stress (p < 0.05, fold change <0.6 or >1.7).
  • Differentially expressed proteins are involved in transcription, translation, cell division, cell wall modification, phyto-hormone metabolism, and various metabolic pathways.
  • Reconstructed an abscisic acid (ABA)-biosynthesis and signaling pathway, indicating systemic protein-level regulation.

Conclusions:

  • Drought stress significantly alters the switchgrass seedling leaf proteome.
  • Identified key proteins regulating transcription, hormone signaling, and metabolism under drought.
  • These identified proteins serve as valuable targets for genetic engineering to enhance switchgrass seedling establishment under drought conditions.