Thursday, October 23, 2014

Genetic Variation and the Evolution of Cold Tolerance


  • Different people have different heat and cold tolerance (that's why). Genetics plus acclimatization.
  • Should therefore fetch plants with genetically good (cold) tolerance plus let them acclimatize.
  • Explains acclimatization for houseplants. (hardening?)
  • Tomatoe varieties that can withstand cold temperature (and be grown in winter) in Egypt.
  • That's why plants I have have acclimatized to the weather (heat) and water (low).
  • That's why it's best to take cuttings or seeds from plants that grow nearby in your same area (for instance for me: from Nasr City rather than from Giza).
  • I love graphs that show results of experiments (data plotted)!
  • Under a certin temperature, a plant or organism stops attempting to acclimatize.


  • Should go explore wild plants in South Sinai and in Siwa (Dr. Mahdy).


  • Aclimatization vs genetic factors.
  • "Cold tolerance varies between geographic races of a species."
  • Opuntia fragilis (cactus)
  • "The geographic range of crop species has been extended into colder regions by palnt breeders."
  • Umbilicus rupestris
  • "Past climatic changes, for example ice ages, will have changed the temperature tolerance of species as well as forcing their migration."