Decrease of sugar content and artificial induction of freezing injury in young peach trees [Prunus persica] by defoliation in autumn
2005
Miyamoto, Y.(Gifu-ken. Research Inst. for Agricultural Sciences in Hilly and Mountainous Areas, Furukawa (Japan)) | Fukui, H. | Naruse, M. | Sugiyama, M.
We chose young 'Showa Hakuto' peach trees to investigate the possible reduction of sugar content and freezing injury through an implementation of defoliation treatments in early September. We measured the moisture level and carbohydrate content at roots, branches and trunks between defoliant trees and non defoliant trees. Experiment Results: There were no significant differences in the moisture level at branches and main trunks between defoliant trees and non defoliant trees. Though there were no major differences in starch content at branches and main trunks between defoliant trees and non defoliant trees, starch content at the roots of defoliant trees remained low in November. There were no major differences in sugar content at roots, branches and trunks between defoliant trees and non defoliant trees until November. However, we observed a gradual increase of sugar content at non defoliant trees and reached its peak in January, whereas no sugar content increase was found at defoliant trees. Our conclusion is that a decrease of sugar content of defoliant trees in winter affects its freezing resistance (the freezing injury were mainly observed at main trunks of defoliant
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