ISHS Acta Horticulturae 227: International Symposium on Vegetative Propagation of Woody Species
ROOTING OF APPLE ROOTSTOCK CLONES AS RELATED TO PHENOLS AND THEIR OXIDATION |
| Authors: | A. Gur, A.E. Gad, E. Haas |
| Abstract:
Phloridzin and phloroglucinol improved, synergistically with indole-butyric-acid, the rooting of hardwood cuttings of certain apple rootstock clones, but were ineffective or even harmful with others. Correlations were found between (a) the phloridzin content of shoot bark of the tested clones, and the percent of surviving cuttings 7 months after planting, as well as the percent of rooted cuttings 12 months after planting with and without application of phloroglucinol. (b) The polyphenol-oxidase (PPO) activity of shoot bark of the tested clones and the increase in rooting percentages obtained by phloroglucinol in these clones. (c) The oxidative changes in light absorption occuring in shoot bark extracts of the tested clones and their rooting potential. (d) The phloridzin content and the PPO activity of shoot bark extracts of the tested clones. The findings point towards the role of high levels of both endogenous phloridzin and PPO in promoting the rooting process of apple cuttings. Externally applied phloroglucinol improved rooting only in clones with sufficient PPO activity to warrant its intense oxidation. | |
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