Short-term and long-term root respiratory acclimation to elevated temperatures associated with root thermotolerance for two Agrostis grass species

Shimon Rachmilevitch, Hans Lambers, Bingru Huang

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

This study was designed to investigate whether thermotolerant roots exhibit respiratory acclimation to elevated temperatures. Root respiratory acclimation traits in response to increasing temperatures were compared between two Agrostis species contrasting in heat tolerance: thermal A. scabra and heat-sensitive A. stolonifera. Roots of both species were exposed to 17, 27, or 37°C. Root RGR declined with increasing temperatures from 17°C to 37°C in both species; however, root growth of A. scabra maintained a significantly higher RGR than A. stolonifera at 27°C or 37°C. A. scabra exhibited a significantly higher respiration acclimation potential to elevated temperatures, both in the short term (60 min) and in the long term (7-28 d) as compared with A. stolonifera, when temperatures increased from 17°C to 27°C or from 27°C to 37°C. Thermal A. scabra also maintained a significantly lower maintenance cost than A. stolonifera as temperatures increased to 27°C or 37°C. The results suggested that root thermotolerance of thermal A. scabra was associated with both short-term and long-term respiratory acclimation to changes in temperatures. The superior ability of adjusting the rate of root respiration to compensate for increases in carbon demand during short- or long-term temperature increases in the heat-tolerant A. scabra may result in the reduction in carbon expenditure or costs for maintenance, leading to extended root survivability in high temperature soils.

Original languageEnglish (US)
Pages (from-to)3803-3809
Number of pages7
JournalJournal of Experimental Botany
Volume59
Issue number14
DOIs
StatePublished - Oct 2008

All Science Journal Classification (ASJC) codes

  • Physiology
  • Plant Science

Keywords

  • Acclimation
  • Grass
  • Heat tolerance
  • High temperature
  • Root respiration

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