Ornamental plants include a very assorted group of crops that comprise hundreds of genera and species. Their effective conservation and use depend on the availability of information, and on the extent and distribution of genetic diversity in species of interest. Morphological data have traditionally been used for the evaluation of biodiversity. They are relatively inexpensive to obtain and are easily accessible to the investigator but they are labour-intensive, subjective and often influenced by environmental conditions. A serious limitation with morphological data is also the small number of traits that can be obtained. In recent years, numerous molecular techniques have been developed to provide markers of diversity. In ornamentals, genetic analyses are often hampered by the genetic structure of many plants, some of which are polyploids, obligate outcrossers, flowering only once a year, etc. Therefore, molecular markers have been developed for most ornamentals to a limited extent when compared to the main food crops and the majority of ornamentals are almost unknown at the genetic level. In order to increase the use of molecular markers to the ornamentals and to improve the genetic knowledge of two among the most economically important ornamental plants, evergreen azalea and garden rose, three studies were carried out.
The Dna-Typing of Ornamental Plants: Evergreen Azaleas (Rhododendron spp.) and Old Garden Roses (Rosa spp.)
SCARIOT, VALENTINA
2006-01-01
Abstract
Ornamental plants include a very assorted group of crops that comprise hundreds of genera and species. Their effective conservation and use depend on the availability of information, and on the extent and distribution of genetic diversity in species of interest. Morphological data have traditionally been used for the evaluation of biodiversity. They are relatively inexpensive to obtain and are easily accessible to the investigator but they are labour-intensive, subjective and often influenced by environmental conditions. A serious limitation with morphological data is also the small number of traits that can be obtained. In recent years, numerous molecular techniques have been developed to provide markers of diversity. In ornamentals, genetic analyses are often hampered by the genetic structure of many plants, some of which are polyploids, obligate outcrossers, flowering only once a year, etc. Therefore, molecular markers have been developed for most ornamentals to a limited extent when compared to the main food crops and the majority of ornamentals are almost unknown at the genetic level. In order to increase the use of molecular markers to the ornamentals and to improve the genetic knowledge of two among the most economically important ornamental plants, evergreen azalea and garden rose, three studies were carried out.
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