Articles
PHENOLOGICAL PROCESSES OF DORMANCY IN APRICOT GENOTYPES IN THE CENTRAL PART OF THE CARPATHIAN BASIN
Article number
862_39
Pages
251 – 256
Language
English
Abstract
The flower bud development of traditional Hungarian and foreign apricot cultivars has been examined by the evaluation of microsporogenesis and the length¬wise growth of pistils in the central part of Hungary in the last 15 years.
Substantial differences were observed between the long and short shoots both in the rate of micro¬sporogenesis and pistil elongation.
In the process of microsporogenesis six develop¬mental stages were distinguished, while pistil development could be divided into four phases.
Significant differences were found between varieties and years in the rate of microsporogenesis, indicating considerable variability in bud development within the apricot species and the sensitive response of apricot to climate changes.
Parallel with the warming of climate, a delay in the end of endodormancy could be observed; in mild winters a longer period was required for the buds to saturate their cold requirements.
At the same time, the pollen development and the flowering of the trees took place earlier due to warmer springs.
Parallel with the development processes, the frost hardiness of the flower buds was also tested by means of artificial freezing.
No close correlation could be demonstrated between frost hardiness and the development stage due to differences in the genetic regulation, but genotypes with a slower rate of development exhibited the best absolute frost resistance in the course of the winter.
Substantial differences were observed between the long and short shoots both in the rate of micro¬sporogenesis and pistil elongation.
In the process of microsporogenesis six develop¬mental stages were distinguished, while pistil development could be divided into four phases.
Significant differences were found between varieties and years in the rate of microsporogenesis, indicating considerable variability in bud development within the apricot species and the sensitive response of apricot to climate changes.
Parallel with the warming of climate, a delay in the end of endodormancy could be observed; in mild winters a longer period was required for the buds to saturate their cold requirements.
At the same time, the pollen development and the flowering of the trees took place earlier due to warmer springs.
Parallel with the development processes, the frost hardiness of the flower buds was also tested by means of artificial freezing.
No close correlation could be demonstrated between frost hardiness and the development stage due to differences in the genetic regulation, but genotypes with a slower rate of development exhibited the best absolute frost resistance in the course of the winter.
Authors
L. Szalay, S. Németh
Keywords
microsporogenesis, pistil length, environmental adaptability
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