Studies on the Flower Initiation in Pharbitis Seedlings IV
Influences of Localized X- or Gamma-irradiation
1969 Volume 82 Issue 967 Pages 1-5
Details
1969 Volume 82 Issue 967 Pages 1-5
Acute moderate doses of ionizing radiations given to the whole plant exert a pronounced influence on the initiation and development of flower primordia in Pharbitis seedlings1, 2). However, they had no effect when the irradiation was restricted to the cotyledons or cotyledonary petioles, or when the plumule was shielded from the radiation by a lead bar. This implies that the ionizing radiationss directly inhibit the initiation and development of flower primordia in the plumule.
Very strong X-rays (40kR-100kR) applied to the cotyledonary petioles inhibited flowering when the radiation was given 12-16 hours after the beginning of the dark period, the time when the floral stimulus might be passing through the petiole.
