ISHS Acta Horticulturae 791: V International Symposium on Olive Growing
PRELIMINARY RESULTS ON POLYAMINE VARIATION IN OLIVE (OLEA EUROPAEA L.) BUDS AS MARKERS OF FLORAL BUD INDUCTION AND DIFFERENTIATION |
| Authors: | E. Rugini, M. Muganu |
| Keywords: | olive, polyamines, floral bud induction |
| Abstract:
Preliminary research indicates that polyamines (PAs) could be markers of flower induction and differentiation in olive. Monthly determination showed an equal PA content between buds collected from suckers and from vigorous shoots sprouted from primary branches, both having a different degree of juvenility producing only vegetative buds. In contrast, the floral buds of fruiting twigs showed a PA content superior to the previous ones throughout the year except in May and July when they were slightly lower. The greatest difference in PA content between floral and vegetative buds was observed in September and early February with a difference of 3 and 2 fold higher in floral buds than in vegetative ones respectively. However, the composition of the PAs was considerably different. In February, the PA content was almost exclusively represented by conjugated spermidine while in September by conjugated Putrescine, Spermidine and bound Putrescine. These results clearly indicate a correlation between the high content of conjugated spermidine and beginning of bud differentiation, which in areas of Central Italy starts to be noted in February while the high PAs content in September could indicate the floral induction of most buds. | |
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