ISHS Acta Horticulturae 508: XIX International Symposium on Improvement of Ornamental Plants
CHARACTERISATION OF A COLLECTION OF HYDRANGEA MACROPHYLLA USING ISOENZYME ANALYSIS |
| Authors: | C. Lambert, H. Bertrand, J. Lallemand, M. Bourgoin |
| Abstract:
Since the commercial varieties of Hydrangea macrophylla Ser. are derived from only a few genitors, their genetic variability is low and few morphological characters can be used for their characterisation. More over, like in many ornamentals, mutations can occur and give very different phenotypes to plants sharing the same genotype. One other problem is the susceptibility of some morphological characters to environmental changes. Figure 1 gives the example of flower colour according to the type of soil used for growing the plant. Therefore, we tried to develop isozyme markers to help characterise cultivars and enable a better management of a collection of about 450 cultivars maintained in Angers. The objective was to detect duplications and mistakes in the labelling of the plants. Incidentally, we hoped to obtain support for the distinction of the 2 subgroups: H. macrophylla spp. macrophylla McClin. and H. macrophylla spp. serrata McClin. which are distinguished by morphological characteristics (size, shape and pubescence of the leaves, the size and brightness of the flowers). | |
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