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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A domestication program for tropical tree species started in the mids in the Peruvian Amazon, and identified Guazuma crinita Mart. 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. Cluster analysis was not related to geographic origin, suggesting a common gene pool.
Sterculiaceae family as one of the priority timber species for agroforestry systems So-telo-Montes and Weber Geographic distance in kilometers above diagonal and Nei’s genetic distance below diagonal.
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.
Guazuma crinita Images – Useful Tropical Plants
This pioneer species can be inter-cultivated with food crops because it has a small crown with thin branches, and the older branches crnita self-prune in the lower crown. Within population variation, genetic diversity, mating systems and stand structures.
Geographic variation guazuuma tree growth and wood density of Guazuma crinita Mart. ISSR fragments were scored as presence 1 or absence 0 of bands in the gel profile. Dendrogram of 44 Guazuma crinita genotypes based on Jaccard’s dissimilarity index. Only strong bands were used to construct a binary matrix.
Guazuma crinita is an important fast-growing timber tree species widely used in agroforestry systems in the Peruvian Amazon. However He of G. 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.
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. Agroforestry -the future guazu,a global land use.
Sample origin and plant material. Population genetic software for teaching and research-an update. Since seeds are dispersed by rivers downstream, we might expect higher genetic diversity below the confluence of major rivers, consequently crinjta conservation in these areas may be an effective conservation strategy.
Genetic variation in growth of Guazuma crinita Mart.
Map of collection areas of 11 provenances that were sampled in the study. The species can potentially produce a dense stand of natural regeneration in open patches Rochon et al. Genetic variation in Costa Rica populations of the tropical timber species Cedrela odorata L. Morphological characters and commercial wood traits have been used traditionally to characterize levels and patterns of diversity; however these traits alone represent only a small portion of the plant genome and are also influenced by environmental factors Muchugi et al.
In general, very little research on intra-specific genetic variation in agroforestry tree species in the tropics has been reported Weber and Sotelo-Montes The range of DNA amplification varied from to 2, bp. A report of genetic differentia tion of Swietenia macrophylla King.
In this study of 44 genotypes from 11 provenances of G. 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.
See table 1 for provenance abbreviations. For example, Russell et al. 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.
This is the first study of genetic diversity and structure of G. A case study from Amazonia. Gene flow Nm was estimated to be Applied Biochemistry and Biotechnology Strategies for genetic conservation of trees in the Peruvian Amazon.
Genetic distances among provenances ranged from 0. The dendrogram showed that the genotypes were grouped into three distinct clusters. Our study revealed Overall genetic differentiation G jt was 0. Tournavista-road also had the lowest Nei’s gene diversity He and Shannon index I.
In addition to ex situ clonal gardens, in situ conservation of populations of G.
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 However, the genetic distance was relatively low between most provenances in the Aguaytia watershed and Macuya, which is in the Pachitea watershed figure 1.
The average numbers of loci and polymorphic loci generated per primer were 6. DNA quality was determined by 0.