ISHS Acta Horticulturae 662: VII International Symposium on Temperate Zone Fruits in the Tropics and Subtropics
IMPACT OF CHANGING CLIMATIC CONDITIONS ON CHILLING UNITS, PHYSIOLOGICAL ATTRIBUTES AND PRODUCTIVITY OF APPLE IN WESTERN HIMALAYAS |
| Authors: | K.K. Jindal, M.S. Mankotia |
| Keywords: | changing climate, apple, chilling units, GDH°C |
| Abstract:
Comparative investigations were undertaken to study the influence of winter temperatures on effective chill units, growing degree hours celsius (GDH°C) requirements and physiological changes associated with the bud dormancy of Starking Delicious apple under two locations viz., location A (ideal apple growing conditions with an altitude of 2286 m amsl) and location B (marginal apple growing conditions with an altitude of 1375 m amsl). Using the Utah Model, the effective chill unit requirements for location A and B were 1208 and 1130, respectively, whereas the GDH°C requirements from rest completion to full bloom for the respective locations were 8893 and 9376. The quantitative analysis of physiological components indicated varying pattern during the course of dormancy. The effects of various chilling units on budbreak and biochemical attributes in young potted apple plants were studied under controlled conditions. It was observed that with the increase in chilling exposure, the days required for bud break were reduced. Biochemical attributes in the shoots immediately after chilling treatments and after 15 days exposure to growing temperature (18±2°C) were estimated. Further, the impact of climatic conditions during winter, spring and summers were assessed for studying the relationship with fruiting parameters of Delicious apple. | |
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