|Authors: ||Hanping Dai, Siwen Liu, Du Xiao|
|Keywords: ||Rubus crataegifolius, Rubus idaeus, overwintering, hybrid sterility|
Red raspberry (Rubus idaeus L.) cultivars from Europe require protective measures to survive winter in the northeast of China.
Otherwise economical production cannot be ensured.
The local wild raspberry species, such as R. crataegifolius Bge., grow and fruit naturally.
Interspecific crosses of two red raspberry cultivars with Chinese wild raspberry, SM5, were made and hybrids were produced.
The objective of this research was to examine these new hybrid raspberry seedlings to determine if they had sufficient cold hardiness to survive in northeast China.
The botanical traits and cold hardiness of the offspring and their parents were evaluated.
Half of the second generation offspring had simple leaves, similar to those of the male parent, SM5. The other half had compound leaves, similar to that of the European red raspberry cultivar female parents.
Among 122 offspring, 38.1% bloomed; 16.3% bloomed but did not fruit; 17.2% had malformed fruit and 4.1% fruited normally.
This demonstrated that sterile hybrids were obtained in some cases. 69.7% of the offspring produced vegetative shoots from the crown after surviving winter without protection.
This indicated they were cold hardy.
Only 1.5% of those offspring fruited normally.
Further research will seek improved fruit quality and cold hardiness in hybrid raspberry seedlings.
Download Adobe Acrobat Reader (free software to read PDF files)
URL www.actahort.org Hosted by KU Leuven