In rose, transcription factor PTM balances growth and drought survival via PIP2;1 aquaporin

Nat Plants. 2019 Mar;5(3):290-299. doi: 10.1038/s41477-019-0376-1. Epub 2019 Mar 4.

Abstract

Plants have evolved sophisticated systems in response to environmental changes, and growth arrest is a common strategy used to enhance stress tolerance. Despite the growth-survival trade-off being essential to the shaping of plant productivity, the mechanisms balancing growth and survival remain largely unknown. Aquaporins play a crucial role in growth and stress responses by controlling water transport across membranes. Here, we show that RhPIP2;1, an aquaporin from rose (Rosa sp.), interacts with a membrane-tethered MYB protein, RhPTM. Water deficiency triggers nuclear translocation of the RhPTM C terminus. Silencing of RhPTM causes continuous growth under drought stress and a consequent decrease in survival rate. RNA sequencing (RNA-seq) indicated that RhPTM influences the expression of genes related to carbohydrate metabolism. Water deficiency induces phosphorylation of RhPIP2;1 at Ser 273, which is sufficient to promote nuclear translocation of the RhPTM C terminus. These results indicate that the RhPIP2;1-RhPTM module serves as a key player in orchestrating the trade-off between growth and stress survival in Rosa.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aquaporins / genetics
  • Aquaporins / metabolism*
  • Arabidopsis / genetics
  • Carbohydrate Metabolism
  • Cell Nucleus / metabolism
  • Cytokinins / metabolism
  • Dehydration
  • Droughts
  • Gene Expression Regulation, Plant
  • Indoleacetic Acids / metabolism
  • Phosphorylation
  • Plant Proteins / genetics
  • Plant Proteins / metabolism*
  • Plants, Genetically Modified
  • Protein Interaction Mapping
  • Rosa / growth & development
  • Rosa / physiology*
  • Serine / metabolism
  • Signal Transduction
  • Transcription Factors / genetics
  • Transcription Factors / metabolism*

Substances

  • Aquaporins
  • Cytokinins
  • Indoleacetic Acids
  • Plant Proteins
  • Transcription Factors
  • Serine