ISHS Acta Horticulturae 439: III International Strawberry Symposium
HISTOCHEMICAL EVENTS AND OTHER FUNDAMENTAL DIFFERENCES BETWEEN AXILLARY AND ADVENTITIOUS STIPULAR SHOOTS IN MICROPROPAGATED STRAWBERRY |
| Authors: | A. Jemmali, A. Robbe, P. Boxus |
| Keywords: | Fragaria x ananassa, dedifferentiation, cytology, stipules |
| Abstract:
Adventitious shoots arise spontaneously on the adaxial surface of the leaf stipules of strawberry 'Gorella' regenerated from meristem tip culture on Boxus medium. The basal mechanism governing this type of organogenesis is a dedifferentiation process taking place at the expenses of epidermal and sub-epidermal group of differentiated cells generally located in the median zone between the stipule tips. The dedifferentiation process is characterised by two main steps. First of all the group of stipular cells mentioned above is converted into cambial feature. Then, those cells are transformed to typical meristematic ones which are responsible of the organ initiation of the neoformed shoots. Comparison made with axillary budding revealed an abnormal phyllotaxy of the first cataphylls of the stipular shoots. In vitro, the stipular shoots proliferate faster than the axillary ones. Plants formed from stipular shoots also produce higher numbers of flowers. However, there was no difference in their fruiting performance when compared in initial field trials. | |
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