ISHS Acta Horticulturae 585: VIII International Rubus and Ribes Symposium
INVOLVEMENT OF GIBBERELLINS DURING FRUIT DEVELOPMENT IN CLOUDBERRY (RUBUS CHAMAEMORUS) |
| Authors: | G. Nilsen, I. Martinussen, A. Erntsen, T.V. Bhuvaneswari, O. Junttila |
| Keywords: | parthenocarpic, seedless, unpollinated, in vitro, plant growth regulators, NAA |
| Abstract:
The purpose of this study was to test the activity of gibberellins and auxins for induction of parthenocarpic fruit development in cloudberry, Rubus chamaemorus L., a dioecious, northern wild berry with potential for cultivation. Application of synthetic hormones is a well-known horticulture procedure, which has been successful in promoting parthenocarpic fruit development in many plant species. Our studies indicate that external application of some GAs induces parthenocarpic fruit development in cloudberry. Unpollinated ovaries were incubated on MS medium containing combinations of the plant hormones BAP, NAA and GA3. Higher proportion of ovaries showed parthenocarpic development in treatments containing GA3 combined NAA, than in treatment containing GA3 alone. Fruits were also larger in size in treatments containing both GA3 and NAA. There seems to be a difference in hormone requirements between in vitro and in planta parthenocarpic fruit development. This difference suggests that hormones, or precursors for biosynthesis of hormones, may have to be transported from other parts of the plant to the developing ovaries for parthenocarpic development. | |
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