EFFECT OF TEMPERATURE ON THE REGULATION SYSTEM OF HOMOEOLOGOUS CHROMOSOME-PAIRING WITH 5B IN WHEAT-RYE F1 PLANTS

For the purpose of clarifying the actions of high temperature and 5BL on chromosome pairing, the response of the regulation system with 5BL to temperature of 15-30°C was examined using wheat-rye F1 plants with or without 5B. The results revealed that by the treatment of 30°C the homoeologous pairing was inhibited in the plants without 5B but was promoted in those with 5B. These findings could be successfully explained by a cooperative action of high temperature and 5B. The present results were consistent with an assumption that high temperature and 5BL influence chromosome pairing through the disturbance of spatial arrangement of chromosomes in premeiotic interphase. It was also suggested that colchicine might be similar to high temperature and 5BL in its acting mechanism on chromosome pairing. © 1979, The Genetics Society of Japan. All rights reserved.