Quantitative genetics of temperature performance curves of Neurospora crassa

Neda N. Moghadam, Karendeep Sidhu, Pauliina A. M. Summanen, Tarmo Ketola, Ilkka Kronholm*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Earth's temperature is increasing due to anthropogenic CO2 emissions; and organisms need either to adapt to higher temperatures, migrate into colder areas, or face extinction. Temperature affects nearly all aspects of an organism's physiology via its influence on metabolic rate and protein structure, therefore genetic adaptation to increased temperature may be much harder to achieve compared to other abiotic stresses. There is still much to be learned about the evolutionary potential for adaptation to higher temperatures, therefore we studied the quantitative genetics of growth rates in different temperatures that make up the thermal performance curve of the fungal model system Neurospora crassa. We studied the amount of genetic variation for thermal performance curves and examined possible genetic constraints by estimating the G-matrix. We observed a substantial amount of genetic variation for growth in different temperatures, and most genetic variation was for performance curve elevation. Contrary to common theoretical assumptions, we did not find strong evidence for genetic trade-offs for growth between hotter and colder temperatures. We also simulated short-term evolution of thermal performance curves of N. crassa, and suggest that they can have versatile responses to selection.

Original languageEnglish
Pages (from-to)1772-1787
Number of pages16
JournalEvolution
Volume74
Issue number8
Early online date29 May 2020
DOIs
Publication statusPublished - Aug 2020

Keywords

  • Evolvability
  • fungi
  • G-matrix
  • wolverhampton
  • reaction norm
  • HEAT-SHOCK PROTEINS
  • THERMAL PERFORMANCE
  • EXPERIMENTAL EVOLUTION
  • CLIMATE-CHANGE
  • COMPARING EVOLVABILITY
  • REACTION NORMS
  • ADAPTATION
  • TOLERANCE
  • RESPONSES
  • phenotypic plasticity

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