ISHS Acta Horticulturae 293: IX International Symposium on Apricot Culture
OBSERVATIONS ON FLOWER BUD GROWTH IN SOME LOW YIELD VARIETIES OF APRICOT |
| Authors: | R. Viti, P. Monteleone |
| Abstract:
The behaviour of four low-yield apricot cultivars ("Portici", "Polonais", "Reale d'Imola" and "Rival", with "San Castrese" as control) was studied over two years in the climatic environments of the coastal area of southern Tuscany (Italy). Flower bud growth was monitored until flowering by means of the following parameters recorded periodically: percentage of anomalies and their characterization; evolution of microsporogenesis; germination percentage; pollen tube elongation. Minimum and maximum daily temperatures were recorded throughout the trial and these data served to calculate Chill Units. The trial confirmed the low yields, associated with a high incidence of anomalies, of the four varieties. The anomalies cannot however be attributed to any specific factors. Our results indicate that the presence of anomalies in these cases is not attributable to late frosts or to an unsatisfied chilling requirement. We think that the high temperatures and/or their daily oscillations during the winter and the "dry conditions" of the previous summer and autumn, probably they are the factors involved. | |
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