Differential physiological and metabolic response to low temperature in two zoysiagrass genotypes native to high and low latitude

PLoS One. 2018 Jun 11;13(6):e0198885. doi: 10.1371/journal.pone.0198885. eCollection 2018.

Abstract

Low temperature is one of the important limiting factors for growing season and geographical distribution of plants. Zoysiagrass (Zoysia Willd) is one of the widely used warm-season turfgrass that is distribute in many parts of the world. Zoysaigrass native to high latitude may have evolved higher cold tolerance than the ones native to low latitude. The objective of this study was to investigate the cold stress response in zoysiagrass native to diverse latitude at phenotypic, physiological and metabolic levels. Two zoysiagrass (Z. japonica) genotypes, Latitude-40 (higher latitude) and Latitude-22 (lower latitude) were subjected to four temperature treatments (optimum, 30/25°C, day/night; suboptimum, 18/12°C; chilling, 8/2°C; freezing, 2/-4°C) progressively in growth chambers. Low temperature (chilling and freezing) increased leaf electrolyte leakage (EL) and reduced plant growth, turf quality, chlorophyll (Chl) content, photochemical efficiency (Fv/Fm) and photosynthesis (Pn, net photosynthetic rate; gs, stomatal conductance; intercellular CO2; Tr, transpiration rate) in two genotypes, with more rapid changes in Latitude-22. Leaf carbohydrates content (glucose, fructose, sucrose, trehalose, fructan, starch) increased with the decreasing of temperature, to a great extend in Latitude-40. Leaf abscisic acid (ABA), salicylic acid (SA) and jasmonic acid (JA) content increased, while indole-3-acetic acid (IAA), gibberellic acid (GA3) and trans-zeatin ribside (t-ZR) content decreased with the reduction of temperature, with higher content in Latitude-40 than in Latitude-22. Chilling and freezing induced the up-regulation of C-repeat binding factor (ZjCBF), late embryogenesis abundant (ZjLEA3) and dehydration-responsive element binding (ZjDREB1) transcription factors in two genotypes, whereas those genes exhibited higher expression levels in Latitude-40, particularly under freezing temperature. These results suggested that zoysiagrass native to higher latitude exhibited higher freezing tolerance may attribute to the higher carbohydrates serving as energy reserves and stress protectants that stabilize cellular membranes. The phytohormones may serve signals in regulating plant growth, development and adaptation to low temperature as well as inducing the up-regulated ZjCBF, ZjLEA3 and ZjDREB1 expressions thus result in a higher cold tolerance.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Abscisic Acid / analysis
  • Abscisic Acid / metabolism
  • Chlorophyll / metabolism
  • Chromatography, High Pressure Liquid
  • Cold Temperature
  • Cyclopentanes / analysis
  • Cyclopentanes / metabolism
  • Freezing
  • Gene Expression Regulation, Plant
  • Genotype
  • Indoleacetic Acids / analysis
  • Indoleacetic Acids / metabolism
  • Mass Spectrometry
  • Monosaccharides / analysis
  • Oxylipins / analysis
  • Oxylipins / metabolism
  • Photosynthesis
  • Plant Growth Regulators / analysis
  • Plant Growth Regulators / metabolism*
  • Plant Leaves / metabolism
  • Plant Proteins / genetics
  • Plant Proteins / metabolism
  • Poaceae / genetics
  • Poaceae / growth & development
  • Poaceae / metabolism*
  • Stress, Physiological*
  • Up-Regulation

Substances

  • Cyclopentanes
  • Indoleacetic Acids
  • Monosaccharides
  • Oxylipins
  • Plant Growth Regulators
  • Plant Proteins
  • Chlorophyll
  • jasmonic acid
  • indoleacetic acid
  • Abscisic Acid

Grants and funding

This work was financially supported by Natural Science Foundation of Hunan Province (2018JJ3223) to Longxing Hu and Science Foundation for The Excellent Youth of Hunan Provincial Education Department (17B120 and 16B149) to Longxing Hu and Yong Yang.