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.

Author: Braktilar Vudojind
Country: Eritrea
Language: English (Spanish)
Genre: Automotive
Published (Last): 24 January 2010
Pages: 423
PDF File Size: 2.59 Mb
ePub File Size: 10.66 Mb
ISBN: 804-4-54880-234-3
Downloads: 24979
Price: Free* [*Free Regsitration Required]
Uploader: Sakasa

The high value for gene flow reflects both pollen dispersal and seed dispersal. Revista Forestal Centroamericana Nei’s genetic distance and geographic distance among the provenances of G. This is similar to the case of C. Young leaf tissue samples of each genotype were individually collected and stored in micro-test tubes with silica gel for further DNA isolation. Tournavista-road also had the lowest Nei’s gene diversity He and Shannon index I. Peakall R, PE Smouse. Forest Ecology and Criniha 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.

Documento de trabajo No. For example, Russell et al. The species can potentially produce a dense stand of natural regeneration in open patches Rochon et al.

Guazuma crinita – Useful Tropical Plants

Applied Biochemistry and Biotechnology It provides wood products at an early age yearscan be coppiced for successive harvests and contributes guazua to farmers’ income Labarta and Weber We recommend guazuna situ conservation strategies for populations with high levels of genetic diversity.


A domestication program for tropical tree species started in the mids in the Peruvian Amazon, and identified Guazuma crinita Mart. Agroforestry -the future of global land use. Topology of the dendrogram showed that clusters were not related to the geographic origins of the genotypes.

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. The dynamic of gene flow via rivers within and among watersheds in the Guazhma Amazon Basin Jansky and forest fragmentation due to shifting cultivation could contribute to the formation of subpopulations Dourojeanni Cluster analysis was not related to geographic origin, suggesting a common gene pool.

We analyzed 44 genotypes of G. A number of authors have examined both natural stands of tropical trees and cultivated samples e.

Ten ISSR primers amplified a total of 65 bands of which 61 were polymorphic There was a weak positive relationship between geographic and genetic distances of the provenances. 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.

In addition to ex situ clonal gardens, criinta situ conservation of populations of G.

Center for International Forestry Research

These results probably reflect the high gene flow in the sample region or limitation of the ISSR markers to reveal the existing variation among provenances. Genetic variation in tree growth, stem form and mortality of Guazuma crinita in slower- and faster-growing plantations in the Peruvian Amazon.


A total of 61 fragments were polymorphic In this study of 44 genotypes from 11 provenances of G. Tree origins and conservation on farm: The authors crinnita Joel Odicio for support with the molecular markers analyses.

Populations from Northeast India. It may reflect the exchange of genes by the influence of human activity along closer watersheds. Primers used in the ISSR analysis and summary of amplifications. Genetic distances among provenances ranged from 0.

Guazuma crinita Images

The dendrogram showed that the genotypes were grouped into three distinct clusters. Gene flow Nm was A rapid DNA isolation procedure for small quantities of fresh tissue. Tree domestication has evolved over the last two decades to become an important global program, and molecular techniques have been used to analyze genetic diversity in several agroforestry tree species Leakey et al. The objectives of our research were i to assess genetic diversity of G.

Map of collection areas of 11 provenances that were sampled in the study. Genetic resource impacts of habitat loss and degradation; reconciling empirical evidence and predicated theory for neotropical trees.

Most diversity occurred within rather than among provenances. The use of genetic markers based on DNA overcome these disadvantages and are able to measure the genetic diversity in plant species White et al.