The drought tolerance is a very important
property of grapevine rootstocks. For that reason the breeding and selection
of new rootstock varieties is focused also on the evaluation of their drought
tolerance. In this experiment, altogether 20 new hybrids and 4 existing
rootstock varieties were compared and evaluated.? The experimental scheme involved 3 variants
of water supply. Evaluated were the following properties:? growth intensity of annual shoots, CCI
(chlorophyll content index) and visual characteristics of plants.? The most resistant were hybrids from the
pedigree groups C (Binova x B?rner), D /Binova
x /(Binova x Teleki 5C/) x B?rner/, and
F (Teleki 5 C x B?rner).
The following hybrids were classified as drought-tolerant: 17-1-6 (C); 17-1-9
(C); 17-6-2 (C); 17-6-9 (C); 17-8-2 (D) and 9-20-1 (F). Based on obtained
experimental results and also on correlations existing between individual
traits it can be concluded that practically all traits under study may be
used when evaluating the resistance of plants to drought. The obtained results
indicated that the B?rner rootstock (and thus also
the species Vitiscinerea)
can be used as a suitable genetic resource for the purpose of the breeding
grapevine rootstocks for tolerance to drought.
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