ISHS Acta Horticulturae 293: IX International Symposium on Apricot Culture
CHANGE IN CATALASE ACTIVITY AND DORMANCY OF APRICOT BUDS IN RESPONSE TO CHILLING |
| Authors: | G. Scalabrelli, R. Viti, F. Cinelli |
| Abstract:
For two subsequent years, plants of the apricot cultivar 'Tirinto' were kept under the following climatic conditions as of leaf fall: a) constant 6°C; b) 6°C for 16 hours and 16°C for 8 hours; c) field conditions; d) 23°C (+1). At 10–15 day intervals three plants per treatment were transferred to a growth chamber. At the same time fresh weight, dry weight, evolution of microsporogenesis and catalase activity were recorded from buds. Catalase activity in flower and leaf buds of apricot was at its maximum during the period of most intense dormancy and diminished during release from dormancy. The decrease was more pronounced in flower buds than in leaf buds. A direct correlation between flower bud weight increase and catalase activity was found. Observations on the evolution of microsporogenesis revealed that meiosis and the subsequent formation of the tetrads occurred in all treatments before the decrease in catalase activity. | |
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