ISHS Acta Horticulturae 410: II International Cherry Symposium
LEAF INDOLE CONTENT AND VIGOUR OF CHERRY ROOTSTOCKS AND SCION VARIETIES |
| Author: | K. Hrotkó |
| Abstract:
Total indole content and vigour were studied in trees of various cherry rootstocks with the scion varieties 'Van' and 'Germersdorfi óriás'. Indole compounds were quantified using the Gordon-Weber reagent as described by Brunner and Antoni (1970). Leaf indole content of the different rootstocks and scion varieties differed significantly. Leaf indole content of the high-vigour Mahaleb rootstock 'Sainte Lucie 64' was the lowest, at 2–4 mg per 100 g, while 'Colt' had five times that amount. The semi-dwarfing or dwarfing MxM rootstocks had six to seven times more indole in their leaves. The leaf indole content of cherry scion varieties was 10 times higher than that of Mahaleb rootstock, while the leaf indole content of the lower-vigour variety 'Van' was higher. The leaf indole content of cherry scion varieties of the same age grafted on rootstocks with differences in vigour (being of significantly different size) did not show any differences attributable to rootstock. Rootstocks with differences in vigour do not therefore affect the leaf indole content of the cherry varieties grafted onto them. Thus, the differences in quantity of indole-auxins cannot be responsible for the differences in vigour. The lower vigour of grafted trees could be caused by other factors. | |
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