Cytogenetic Studies in Solanum melongena L.

II. Chiasmata frequency

Abstract

1. The chiasmata frequency and terminalisation coefficient have been studied in S. nielongena L. varieties purple long, white bunchy, white round, insanurn, green oval, purple oval, and first generation cross XA of purple long×white bunchy. The chiasmata frequency varied between 0.77 to 1.37, the terminalization coefficient between 0.63 to 0.98. The respective figures with cross XA are 1.36 and 1.16.
2. The chiasmata has been found to be located in the less stained or achromatic regions also of the bivalents.
3. Though the overall chiasmata frequency in these varieties is very low, it has been interpreted that the greater the number of medianly constricted chromosomes, the higher is the chiasmata frequency.