Genetic Variation and the Evolution of Cold Tolerance

Thoughts

• 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.

Do

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

Textbook

• 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."