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Growth and respiration of dormant flower buds of pyrus communis and pyrus calleryana

Growth and respiration of dormant flower buds of pyrus communis and pyrus calleryana

Journal of the American Society for Horticultural Science 107(2): 226-231

Respiration of flower buds of P. communis L., a late blooming species, and P. calleryana, an early blooming species, was investigated throughout the winter. Respiration of P. calleryana Decne at 5.degree. C was twice as high as that of P. communis, whereas the respiration rates were similar at 25.degree. A large portion (60-70%) of the respiration at 5.degree. was cyanide resistant in P. calleryana and much less in P. communis. The combination of inhibitors, cyanide (KCN) and salicylhydroxamic acid (SHAM), still only partially inhibited respiration. The residual respiration was much higher for P. calleryana than for P. communis.

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