ISHS Acta Horticulturae 314: II International Symposium on Propagation of Ornamental Plants
THE PHYSIOLOGICAL BACKGROUND FOR REGULATION OF ADVENTITIOUS ROOT FORMATION BY THE IRRADIANCE TO STOCK PLANTS: A HYPOTHESIS. |
| Author: | L. Bertram |
| Abstract:
Increased irradiance to stock plants can either increase or decrease the adventitious root formation of cuttings depending on the species examined. It is still unclear why some species produce more roots while others produce fewer roots as irradiance to stock plants increases. It has been proposed that there is an optimum irradiance to stock plants for the adventitious root formation of the cuttings. A hypothesis is given to explain the physiological events leading to this phenomenon. This hypothesis centers on the fact that auxin plays an important part in the adventitious root formation. It is proposed that the concentration of auxin increases with increased irradiance to stock plants. The decreased adventitious root formation observed when the irradiance to the stock plants exceed the optimal irradiance may be explained by a decrease in sensitivity to auxin. The concepts of sensitivity is discussed in relation to the present subject. The decreased rooting at high irradiance to the stock plants may also be explained by a reduced amount of tissues in a less differentiated state. This may yield a lower potential for dedifferentiation, which is a prerequisite for the adventitious root formation. | |
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