Physiological and morphological study of the flowering in micropropagated strawberry (Fragaria x ananassa Duch) plantlets, cv. Gorella
1994
Jemmali, A.
Floral overproduction, also called hyperflowering was observed in some micropropagated strawberry cultivars like Gorella. This abnormal reproductive behaviour is reported to be amplified by the number of in vitro subcultures. Histological techniques and electron microscopy showed that the vitroplants presenting hyperflowering symptoms are affected by anatomical alterations at the level of epicuticular wax, parenchyme and chloroplasts of in vitro leaves. They also become more sensitive to the floral induction which starts earlier than in normal plants. The use of peroxidases as a biochemical marker of the hyperflowering is not definitly established, nevertheless cytokinins are more promising. Strawberry plants issued from stipular shooting, a particular form of in vitro direct organogenesis present the same hyperflowering phenomenon. When cloned and compared to the axillary shoots, the stipular ones proliferates more abundantly, present teratological formation e.g. fasciation and multi-apex. Their regenerants have a normal vegetative phenotype, but they are much more floriferous and transmit this character to their first runner progeny.
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