Guazuma crinita is a semideciduous tree with a narrow, elongate or pyramidal crown; it can grow 7 – 18 metres tall in Brazil, but can exceed 30 metres in Bolivia . PDF | Guazuma crinita (Mart.) is an important timber-tree species for agroforestry plantations in the Peruvian Amazon Basin. Trees are typically. Peruvian smallholder production and marketing of bolaina (Guazuma crinita), a fast-growing Amazonian timber species: Call for a.

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We hypothesized that there is a high level of polymorphism within provenances, very little differentiation among provenances and a positive relationship between genetic distance and geographic distance among provenances.

A report of genetic differentia tion of Swietenia macrophylla King. Nevertheless, there was a weak positive correlation between genetic and geographic distance of the provenances. Young leaf tissue samples of each genotype were individually collected and stored in micro-test tubes with silica gel for further DNA isolation.

ISSRs are an efficient tool to analyze the variability and genetic structure in natural, managed and cultivated tree stands, and are useful to identify genotypes, even among highly related individuals Thangjam In this study of 44 genotypes from 11 provenances of G. The mating system of G. Results from the provenance test indicated that the provenance from the local watershed Aguaytia performed better in terms of growth than did provenances from other watersheds in the Peruvian Amazon Basin Weber and Sotelo-Montes Biodiversity and Conservation Most diversity occurred within rather than among provenances.

Agroforestry -the future of global land use.

Sterculiaceae guazuka as one of the priority timber species for agroforestry systems So-telo-Montes and Weber Do farmers reduce genetic diversity when they domesticate tropical trees?

In Dawson I, R Jamnadass eds. However, the cluster analysis did not reveal any clear geographical pattern among the genotypes from the different provenances. The authors thank Manuel Soudre for providing access to the clonal garden and information about the genotypes of G. Gene flow Nm was estimated to be Ten ISSR primers amplified a total of 65 bands of which 61 were polymorphic A rapid DNA isolation procedure for small quantities of fresh tissue.


Dendrogram of 44 Guazuma crinita genotypes based on Jaccard’s dissimilarity index. Revista Forestal Centroamericana The sample included 44 genotypes from 11 gguazuma in the Aguaytia and neighboring Pachitea watersheds in the Peruvian Amazon. Populations from Northeast India. Canada program guszuma in: The percentage of polymorphic bands was higher in Aguaytia watershed, while Nei’s gene diversity He and Shannon index I were higher in the Pachitea watershed. Popula tion genetic structure of mahogany Swietenia macrophylla King, Meliaceae across the Brazilian Amazon, base on microsatellite at the loci: The overall analyses of genetic variation at watershed and provenance level are shown in table 3.

The DNA amplified using ISSR markers generated a total number of 65 fragments by the ten primers; the amplified fragments were within a range of to 2, bp. A domestication program for tropical tree species started in the mids in the Peruvian Amazon, and identified Guazuma crinita Guazmua. Genetic variation in growth of Guazuma crinita Mart.

Center for International Forestry Research

Primers used in the ISSR analysis and summary of amplifications. Advances in Agroforestry 9 2: Trees can begin gazuma after years and produce millions of seeds that are dispersed by both wind and water at the beginning of the rainy season Rochon et al. There was a weak positive relationship between geographic and genetic distances of the provenances.

Gene flow Nm was An analysis of Nei’s genetic identities of the pair-wise comparison between provenances varied from 0. Mantel crnita in Gen Al Ex V6 Peakall and Smouse was performed using Nei’s unbiased genetic distances matrix and the matrix of geographic distances to determine whether the geographical and genetic distances between provenances were correlated.


Although we were aware that our sample size was not extensive limitation caused by small number of individual trees in the clonal orchardother researchers have investigated genetic diversity in tree species crknita even smaller sample sizes e.

Guazuma crinita – Useful Tropical Plants

However He of G. This study indicates that ISSR markers are effective and a relatively easy way to crintia polymorphism and characterization of genetic variation. In general, very little research on intra-specific genetic variation in agroforestry tree species in the tropics has been reported Weber and Sotelo-Montes They were identified and selected based on phenotypic measurements along ten years of evaluation.

There was no clear grouping of genotypes based on the genotypes’ provenance of origin or criita to other provenances. These results probably cdinita the high gene flow in the sample region or limitation of the ISSR markers to reveal the existing variation among provenances. We analyzed 44 genotypes of G. Strategies for genetic conservation of trees in the Peruvian Amazon.

Geographic distance in kilometers above diagonal and Nei’s genetic distance below diagonal. Topology of the dendrogram showed that clusters were not related to the geographic origins of the genotypes. Nei’s genetic distance and geographic distance among the provenances of G. Only strong bands were used to construct a binary matrix.

A number of authors have examined both natural stands of tropical trees and cultivated samples e. Tournavista-road also had gazuma lowest Nei’s gene diversity He and Shannon index I.

Guazuma crinita

Overall genetic differentiation G jt was 0. ISSR fragments were scored as presence 1 or absence 0 of bands in the gel profile. Applied Biochemistry and Biotechnology