Effect of high temperature on incompatibility in radish

Summary Clones of radish plants were cross-pollinated or selfed at 17 and 26 °C. In crosscompatible plants the fruit set; the average number of seeds per fruit and the total seed yield were decreased at 26 °C. In incompatible plants the fruit set and the total seed yield were increased when selfing was done at the higher temperature. It is concluded that while high temperature has an unfavourable effect on seed set of radish plants, it also weakens the incompatibility reaction between pollen and style, so that the result is a small increase in yield.