EXPERIMENTS ON TOLERATION OF TEMPERATURE BY DROSOPHILA.

Area of Science:

• Genetics
• Zoology
• Environmental Science

Background:

• Drosophila melanogaster is a key model organism in genetic research.
• Temperature tolerance varies among insect populations and species.
• Understanding thermal limits is crucial for predicting species' responses to climate change.

Purpose of the Study:

• To investigate the temperature tolerance of wild and mutant Drosophila melanogaster stocks.
• To identify genetic or physiological factors influencing thermal sensitivity in Drosophila.
• To compare heat tolerance across different Drosophila species.

Main Methods:

• Breeding experiments were conducted at controlled temperatures (24°C and 31°C).
• Wild and mutant stocks of Drosophila melanogaster were tested for reproductive success.
• Comparative analysis included other Drosophila species (D. virilis, D. simulans, D. immigrans, D. funebris) and Chymomyza procnemis.

Main Results:

• Most wild Drosophila melanogaster stocks bred successfully at 31°C, irrespective of geographic origin.
• One wild stock exhibited reduced breeding at temperatures above 29°C, with offspring fertile at 24°C.
• Mutant stocks showed reduced fertility at 31°C, with offspring fertile at 24°C, suggesting a physiological effect of homozygous mutant genes.
• D. virilis and C. procnemis tolerated 31°C, while D. simulans, D. immigrans, and D. funebris did not.
• Flies from mutant stocks hatched at 31°C could produce offspring when mated with flies hatched at 24°C, indicating germ cell viability.

Conclusions:

• Temperature tolerance at 31°C is high in most wild Drosophila melanogaster stocks.
• Mutant Drosophila melanogaster stocks exhibit a physiological response to heat, impacting reproduction.
• Inbreeding at elevated temperatures may disrupt fertilization or gamete interaction in sensitive stocks.
• Species distribution and thermal tolerance are linked, with northern species showing lower heat tolerance.