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Journal of the Japanese Society for Horticultural Science
Vol. 73 (2004) No. 3 P 244-246



Budbreak on 2-bud cuttings of Actinldia arguta and A. rufa, exposed to 200 hr of natural chilling below 7°C and additional chilling at 4°C was compared with that of kiwifruit, A. deliciosa and A. chinensis. A high percentage of budbreak occurred in A. arguta and A. rufa indicating that they have a very low chilling requirement, namely 200 hr, under natural conditions, whereas A. deliciosa cultivars required 600-800 hr or more of chilling; chilling requirement of A. chinensis was intermediate. Some interspecific hybrids also exhibited a low chilling requirement.

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