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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Our study revealed For example, Russell et al. Dendrogram of 44 Guazuma crinita genotypes based on Jaccard’s dissimilarity index. They were identified and selected based on phenotypic measurements along ten years of evaluation.

Guazuma crinita Images – Useful Tropical Plants

However, we recommend analyzing more samples per population with employment of other types of molecular markers in future studies of genetic diversity as a basis of genetic improvement to G. The cycling conditions crinitw as follows: There was a weak positive relationship between geographic and genetic distances of the provenances.

Do farmers reduce genetic diversity when they domesticate tropical trees?

In order to assess relationships among provenances, a cluster analysis was used to generate a dendrogram based on Jaccard’s dissimilarity among the 44 genotypes figure 2.

Map of collection areas of 11 provenances that were sampled in the study. Mantel test in Gen Al Ex V6 Peakall and Smouse criinita 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.

Genetic variation in growth of Guazuma crinita Mart. Overall coefficient of genetic differentiation G st was 0. Trees can begin flowering 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.

Documento de trabajo No.

BOLD Systems: Taxonomy Browser – Guazuma crinita {species}

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 using even smaller sample sizes e. Cluster analysis was not related to geographic origin, suggesting a common gene pool.


Nevertheless, there was a weak positive correlation between genetic and geographic distance of the provenances. An analysis of Nei’s genetic identities of the pair-wise comparison between provenances varied from 0.

Among the 30 universal UBC-ISSR primers University of British Columbia, Canada tested for their ability to produce distinct, reproducible and well-resolved fragments in the 44 individual genotypes, 10 primers were selected for the amplification of all the samples table 2. Genetic distances among provenances ranged from 0.

Temporal and spatial genetic structure in Vitellaria paradoxa shea tree in an agroforestry system in southern Mali.

Genetic variation in Costa Rica populations of the tropical timber species Cedrela odorata L. Genetic resource impacts of habitat loss and degradation; reconciling empirical evidence and predicated theory for neotropical trees.

A report of genetic differentia tion of Swietenia macrophylla King.

Genetic variability is essential to the success of strategies for tree improvement including selection, sustainable management and genetic resource conservation O’Neill et al. Population genetic software for teaching and research-an update. Geographic distance in kilometers above diagonal and Nei’s genetic distance below diagonal. ISSR fragments were scored as presence 1 or absence 0 of bands in the gel profile.

Guazuma crinita

Primers used in the ISSR analysis and summary of amplifications. In Dawson I, R Jamnadass eds. Wood density also varied genetically among provenances Weber and Sotelo-Montes Young leaf tissue samples of each genotype were individually collected and stored in micro-test tubes with silica gel for further DNA isolation. In this study of 44 genotypes from 11 provenances of G. A number of authors have examined both natural stands of tropical trees and cultivated samples e.

A domestication program for tropical tree species started in the mids in the Peruvian Amazon, and identified Guazuma crinita Mart. The authors thank Joel Odicio for support with the molecular markers analyses.

Agroforestry -the future of global land use.

Tree domestication has evolved over the last two decades to become an important global program, and guszuma techniques have been used to analyze genetic diversity in several agroforestry tree species Leakey et al.


Our results confirm that even a small clonal garden that was used in our research –under the conditions that the collection be correctly done– could possess relatively high genetic diversity and thus could form a good base for further domestication of the species. Popula tion genetic structure of mahogany Swietenia macrophylla King, Meliaceae across the Brazilian Amazon, base on microsatellite at the loci: However, the crjnita distance was relatively low between most provenances in the Aguaytia watershed and Macuya, which is in the Pachitea watershed figure 1.

Its importance has prompted research to identify the best provenances and improve the management of the species. Tree origins and conservation on farm: It may reflect the exchange of genes by the influence of human activity along closer watersheds. Applied Biochemistry and Biotechnology Seeds can be dispersed over long distances by wind, and also downstream by water, hence we expected little differentiation among provenances.

See table 1 for guazua abbreviations. Huazuma Manual N o 9. The average numbers of loci and polymorphic loci generated per primer were 6.

Most diversity occurred within rather than among provenances. The lowest genetic distance was between Nueva Requena ANR and Curimana river ACR provenances which are both guazjma along the Curimana river figure 1suggesting that downstream dispersal of seeds reduces the genetic distance.

Only strong bands were used to construct a binary matrix. Inter Simple Sequence Repeat ISSR markers combine some advantages of other markers such as reproducibility, low costs and no need to develop species-specific primers for analysis.

DNA quality was determined by 0. In general, very little research on intra-specific genetic variation in agroforestry tree species in the tropics has been reported Weber and Sotelo-Montes This suggests that geographic distance had a guaauma effect on genetic differentiation among provenances.