Population Genetic Analysis of A Neotropical Tree Species: Tapirira guianensis
Arwa SHAHIN;
Abstract
Ecological devastation is widespread in the tropics where forests continue to disappear
at an increasing and alarming rate. To maintain forests as evolutionary viable units able
I
to adapt to changing conditions in the long term, genetic variation must exist To date,
genetic diversity in tropical trees species has only been investigated for a limited number
of species. I
This study is a part of GENEO-TROPECO project; it is a collaboration between siJf:
international organizations which are: INPA (Brazil), UFRJ (Brazil), CATIE (Costa Rica)1
INRA (France) IPBO (Belgium) and CEH (Scotland UK). The aim of this project is tb evaluate the level and dynamics of genetic diversity in natural forest populations. An important criterion already identified for genetic diversity is conservation of the
'
processes that maintain genetic variation, for which four indicators have been identified:
i) levels of genetic variation. ii) Mating system processes. iii) Directional change in gen or genotype frequencies and iv) Gene migration between populations.
To rapidly and efficiently measure and evaluate the genetic diversity within and betweEin different populations of a given species, DNA fingerprinting techniques have proven to be very useful. In this study, we determined the genetic diversity of a tropical tree
species (Tapirira guianensis) in natural forest populations. The fast growing and
I
dominant tree Tapirira guianensis, is one of the most frequent tree species in the Atlantic
I
rainforest fragments. Tapirira guianensis (Anacardiaceae) populations were sampled .in
the Neotropical region (Middle and South America) from four populations, one in French
. I
Guiana (Paracou), one in Brazil (Manaus) and two in Costa Rica (Corinto, Tirimbina).
I
Six primer pairs resulted in a total of 198 scored bands with 93.43% of them bei[lg polymorphic. Based on analysis of molecular variance within and between populatiohs (AMOVA), T.guianensis appears to have most of its genetic diversity (89.21%) witin populations and little variation between populations (10.79%, P< 0.001). This result is similar to those observed in other woody, widely distributed, outcrossed, long liVed perennial species using different molecular markers
at an increasing and alarming rate. To maintain forests as evolutionary viable units able
I
to adapt to changing conditions in the long term, genetic variation must exist To date,
genetic diversity in tropical trees species has only been investigated for a limited number
of species. I
This study is a part of GENEO-TROPECO project; it is a collaboration between siJf:
international organizations which are: INPA (Brazil), UFRJ (Brazil), CATIE (Costa Rica)1
INRA (France) IPBO (Belgium) and CEH (Scotland UK). The aim of this project is tb evaluate the level and dynamics of genetic diversity in natural forest populations. An important criterion already identified for genetic diversity is conservation of the
'
processes that maintain genetic variation, for which four indicators have been identified:
i) levels of genetic variation. ii) Mating system processes. iii) Directional change in gen or genotype frequencies and iv) Gene migration between populations.
To rapidly and efficiently measure and evaluate the genetic diversity within and betweEin different populations of a given species, DNA fingerprinting techniques have proven to be very useful. In this study, we determined the genetic diversity of a tropical tree
species (Tapirira guianensis) in natural forest populations. The fast growing and
I
dominant tree Tapirira guianensis, is one of the most frequent tree species in the Atlantic
I
rainforest fragments. Tapirira guianensis (Anacardiaceae) populations were sampled .in
the Neotropical region (Middle and South America) from four populations, one in French
. I
Guiana (Paracou), one in Brazil (Manaus) and two in Costa Rica (Corinto, Tirimbina).
I
Six primer pairs resulted in a total of 198 scored bands with 93.43% of them bei[lg polymorphic. Based on analysis of molecular variance within and between populatiohs (AMOVA), T.guianensis appears to have most of its genetic diversity (89.21%) witin populations and little variation between populations (10.79%, P< 0.001). This result is similar to those observed in other woody, widely distributed, outcrossed, long liVed perennial species using different molecular markers
Other data
| Title | Population Genetic Analysis of A Neotropical Tree Species: Tapirira guianensis | Other Titles | تحليل وراثى مجتمعى لنوع شجرى مدارى من العالم الجديد : Tapirira Guianensis | Authors | Arwa SHAHIN | Issue Date | 2007 |
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