Abstract
The genus Dimorphandra has distinguish relevance considering either medicinal or biodiversity aspects because it includes two species that are economically important flavonoids sources for pharmachemical industry (D. mollis Benth. and D. gardneriana Tul.), and species endemic to Brazil, such as D. jorgei Silva and D. wilsonii Rizz., threatened by extinction. In order to evaluate variability among accessions of D. mollis (fava-d'anta), D. gardneriana and D. wilsonii, it was collected fruit from individual plants from three Brazilian states in a total of 57 accessions, which were analyzed with RAPD markers. It was used 20 seeds per progeny; the DNA was extracted from fully-formed young leaves, which were collected in bulk. The data were analyzed using a binary matrix, in which the score one represented presence of a band and zero, absence. The similarity matrix was developed by using the arithmetic complement of the Jaccard index, later grouped based on the Neighbor Joining algorithm. It was found considerable intra and inter specific variability in Dimorphandra spp., which were separated into four groups. Though genetic variability was found, the collecting trips showed that most of these areas are subject to loss of genetic resources of fava-d'anta due to the following factors: continuous anthropic activity, propensity for natural fires, and loss of natural seed dispersers (large fruit-eating mammals). Therefore, protections of these areas and ex situ conservation are essentials for the maintenance of genetic variability of these species.
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Claims 4
Claim · model-written summary
Dimorphandra accessions showed considerable within- and between-species variability.
- Taxon
- Dimorphandra spp.Dimorphandrae0
- Outcome
- intra and inter specific variabilitye0
- Direction
- considerablee0
Verbatim
e0“considerable intra and inter specific variability in Dimorphandra spp., which were separated into four groups”
Claim · model-written summary
Dimorphandra accessions separated into four groups.
- Taxon
- Dimorphandra spp.Dimorphandrae0
- Outcome
- separated into four groupse0
- Value
- four groupse0
Verbatim
e0“Dimorphandra spp., which were separated into four groups”
Claim · model-written summary
Collection areas face genetic-resource loss from human activity, fires and loss of dispersers.
Verbatim
e0“most of these areas are subject to loss of genetic resources of fava-d'anta due to the following factors: continuous anthropic activity, propensity for natural fires, and loss of natural seed dispersers (large fruit-eating mammals)”
Claim · model-written summary
The authors recommend area protection and ex situ conservation to maintain genetic variability.
- Taxon
- Dimorphandra spp.Dimorphandrat0
- Outcome
- protections of these areas and ex situ conservatione0
Verbatim
e0“protections of these areas and ex situ conservation are essentials for the maintenance of genetic variability of these species”
t0“Dimorphandra spp.”