ISHS Acta Horticulturae 80: Symposium on Growth Regulators in Fruit Production
CYTOCHEMICAL INVESTIGATIONS IN APICES OF APPLE BUDS WITH SPECIAL REFERENCE TO FLOWER INITIATION |
| Authors: | T. Bubán, I. Simon |
| Abstract:
Terminal buds were harvested from spurs bearing fruits and from those without fruits. Using longitudinal sections, the DNA, DNA+RNA and nucleohistone content in various regions of the apex was measured cytophotometrically. Presence of the fruit induced a lower level of nucleic acids and a higher nucleohistone content. These conditions proved to be inhibiting for flower initiation. Absence of the fruit resulted in totally reversed effects, providing favourable preconditions for flowering. The DNA+RNA content is higher at the stage of histological differentiation of the apices even on spurs bearing fruits if treatments by Ethrel had been carried out formerly. This effect seems to be delayed by using a morphactin. Treatments by both synthetic growth regulators exert a considerable promoting effect on flower bud formation resulting in a higher yield. | |
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