ISHS Acta Horticulturae 403: International Symposium on Cultivar Improvement of Horticultural Crops. Part 2: Fruit Crops
CHILLING AND POST-DORMANT HEAT REQUIREMENT OF QUINCE AND PEAR AS ROOTSTOCKS FOR PEAR |
| Authors: | D. Hongyi, Frank H. Alston |
| Keywords: | Chilling requirement, heat requirement, rootstock, pre-selection, quince, pear |
| Abstract:
The chilling and post-dormant heat requirement of quince (Cydonia oblnga), xPyronia veitchii cv. Luxembergiana Guillaumin O. P. and pears (Pyrus communis, P. elaeagrifolia, P. longipes, P. betulaefolia,) and xPyronia x P. communis for bud break were examined, by means of placing shoot cuttings in the glasshouse at 16°C at monthly intervals during the winter. Results showed that the chilling requirement of quince was shorter than that of pears. Both chilling and heat requirement were related to the source of material, and were probably polygenic characters. IN mature quince trees, significant correlations were found between chilling and heat requirement: chilling requirement and budbreak date; heat requirement and budbreak date; and budbreak date and flowering date; in hedged quinces and pears, significant correlations were found between chilling and heat requirement; chilling requirement and bud break date; and heat requirement and budbreak date. Moreover, in quince there was a good relation between size controlling potential and the number of days to bud break in the glasshouse, and a good relation between size controlling potential and the number of days to bud break in the December sampling. Therefore it is believed that chilling and heat requirement for bud break in the glasshouse, and budbreak date in the field could be used for flowering date reselection in quince, and the number of days to bud break in December for reselection for dwarfing potential in quince rootstock. | |
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