Effect of Temperature on Crossingover in Heterozygous T5-6c With Homozygous Inversion in Chromosome 5 in Maize

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1. Heterozygous T5-6c with homozygous inversion in chromosome 5 has been used to study the effect of exposure to 36±2°F on crossingover.2. Crossingover frequency has been calculated by ascertaining directly the frequency of the crossover quartet.3. Data on the effect of exposure of heterozygous T5-6c with homozygous inversion in chromosome 5 to 36±2°F have been presented.4. The presence of an inversion increased the frequency of chains from 40% to 60%.5. The period of maximum response to the influence of low temperature exposures is 4-6 day period in the 5th week. The increase in crossover frequency is from 10.6% to 12.9% almost approaching the maximum limit of 13.2%.6. It has been suggested that the effect of low temperature on crossingover is through its influence on interference.The writer wishes to express his deep appreciation of Dr. C. R. Burnham for his continued interest, kind criticism and many helpful suggestions during the earlier course of this investigation. He is thankful to him for the stocks he made available for research. To Dr. A. O. Dahl of the Department of of Botany, University of Minnesota the writer is indebted for constructive crticism during the later course of this investigation.
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