Genetic variation in tree growth, stem form and mortality of <i>Guazuma crinita</i> in slower- and faster-growing plantations in the Peruvian Amazon

Weber, John C.; Montes, Carmen Sotelo; Cornelius, J.P.; Ugarte, Julio

doi:10.1515/sg-2011-0010

Cited by 15 publications

(9 citation statements)

References 18 publications

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“…This is similar to the case of C. spruceanum, which showed much higher genetic variability within than among populations in the Peruvian Amazon (Russell et al 1999). These results are also consistent with results from provenance and provenance/ progeny tests of G. crinita, which showed considerable genetic variation in tree growth and wood density within provenances (Rochon et al 2007, Weber et al 2011.…”

Section: Discussionsupporting

confidence: 87%

“…A number of authors have examined both natural stands of tropical trees and cultivated samples (e.g. Hollingsworth A provenance test and a provenance/progeny test of G. crinita were established in the Aguaytia watershed in the Peruvian Amazon Basin to investigate genetic variation in growth and wood density, correlations between growth and density and environmental differences among planting zones in the watershed (Rochon et al 2007, Weber et al 2011. 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 .…”

Section: Discussionmentioning

confidence: 99%

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Genetic diversity in Guazuma crinita from eleven provenances in the Peruvian Amazon revealed by ISSR markers

et al. 2016

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SUMMARYGuazuma crinita is an important fast-growing timber tree species widely used in agroforestry systems in the Peruvian Amazon. The objectives of our research were (i) to assess genetic diversity of G. crinita using inter-simple sequence repeat (ISSR) markers and (ii) estimate correlation between genetic and geographic distances among provenances. The sample included 44 genotypes from 11 provenances in the Aguaytia and neighboring Pachitea watersheds in the Peruvian Amazon. Ten ISSR primers amplified a total of 65 bands of which 61 were polymorphic (93.8 %). The range of DNA amplification varied from 260 to 2,200 bp. Among the provenances, Macuya exhibited the highest percentage of polymorphic bands (PPB) with 67.7 %, 0.21 Nei's gene diversity (He) and 0.33 Shannon index (I). Overall genetic differentiation (G st ) was 0.03, indicating 97 % of genetic diversity within provenances. Gene flow (Nm) was 12.9 alleles per generation. Cluster analysis was not related to geographic origin, suggesting a common gene pool. However a weak positive correlation (r = 0.27, P < 0.05) was found between genetic and geographic distance. This is the first study of genetic diversity and structure of G. crinita. We recommend in situ conservation strategies for populations with high levels of genetic diversity.Key words: inter-simple sequence repeat markers, genetic diversity, genetic distance, gene flow, geographic distance. RESUMENGuazuma crinita es una importante especie maderable de rápido crecimiento ampliamente usada en sistemas agroforestales en la Amazonía Peruana. Los objetivos de nuestra investigación fueron; (i) evaluar la diversidad genética de G. crinita revelada por marcadores de intersecuencias simples repetidas (ISSR) además de (ii) estimar la correlación entre las distancias genéticas y geográficas entre procedencias. La muestra incluyó 44 genotipos de 11 procedencias en las cuencas de Aguaytía y Pachitea en la Amazonía Peruana. Diez cebadores ISSR amplificaron un total de 65 bandas de las cuales 61 fueron polimórficas (93,8 %). El rango de amplificaciones de ADN varió desde 260 hasta 2.200 bp. Entre las procedencias, Macuya exhibió el mayor porcentaje de bandas polimórficas (PPB) con 67,7 %, 0,21 diversidad genética de Nei (He) y 0,33 de índice de Shannon (I). La diferenciación genética general (G st ) fue 0,03, indicando 97 % de la variación genética dentro de las procedencias. El flujo genético (Nm) fue 12,9 alelos por generación. El análisis de agrupamiento no estuvo relacionado con el origen geográfico sugiriendo una fuente genética en común. Sin embargo, se encontró una correlación positiva débil (r = 0,27, P < 0,05) entre las distancias genéticas y geográficas. Este es el primer estudio sobre la diversidad y estructura genética de G. crinita. Se recomiendan estrategias de conservación in situ para las poblaciones con altos niveles de diversidad genética.Palabras clave: marcadores Inter-simple sequence repeat, diversidad genética, distancia genética, flujo genético, distancia geográfica.

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Section: Discussionsupporting

confidence: 87%

Section: Discussionmentioning

confidence: 99%

Genetic diversity in Guazuma crinita from eleven provenances in the Peruvian Amazon revealed by ISSR markers

et al. 2016

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“…While only a small number of trees of the six provenances was sampled in this study, there were differences in means among provenances, but we did not statistically analyze the difference. Prior to our study, two tests were conducted to investigate genetic variation in growth, wood density, stem form and mortality among provenances (Rochon et al, 2007;Weber and Sotelo-Montes, 2008;Weber et al, 2011).…”

Section: Discussionmentioning

confidence: 99%

Variation in wood physical properties within stems of Guazuma crinita, a timber tree species in the Peruvian Amazon

Coral

Odicio-Guevara

Weber³

et al. 2017

MYB

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An understanding of wood physical properties and the interrelationships that govern them is required for efficient utilization of timber tree species. Guazuma crinita is a fast-growing timber tree of agroforestry systems in the Peruvian Amazon. The aim of this study was to assess variation in wood physical properties within the G. crinita stem. Wood samples were obtained from the base, middle and top of the stem of 12 randomly selected eight-year-old trees from six provenances in order to determine wood moisture content, density, specific gravity, radial, tangential and volumetric shrinkage and the coefficient of anisotropy. Pearson correlations between physical properties were also determined. The highest basic density was 459 kg/m3 from Tournavista provenance. Mean basic density and specific gravity were 430 kg/m3 and 0.45 respectively. There was statistically significant variation (p ≤ 0.05), due to stem level within the trees. The moderate values of density and anisotropy coefficient (1.56) suggest that G. crinita is a stable wood; these are important advantages in terms of costs of the processes of transport and transformation. Given the variation found in the limited tree samples of this study, we recommend further analysis with larger samples from different provenances and planting zones.Variación de las propiedades físicas en troncos de Guazuma crinita, una especie maderable en el Amazonas Peruano El entendimiento de las propiedades físicas de la madera y de las interrelaciones que las gobiernan es necesario para el uso eficiente de las especies maderables. Guazuma crinita es una especie arbórea de rápido crecimiento en sistemas agroforestales del Amazonas peruano. El objetivo de este estudio fue determinar la variación de las propiedades físicas de la madera en el fuste de árboles G. crinita. Las muestras de madera fueron obtenidas de la base, parte media y parte superior del tronco de 12 árboles de ocho años de edad aleatoriamente seleccionados, de seis lugares de procedencia. Con ellas se determinó: contenido de humedad, densidad, densidad relativa, contracciones radial, tangencial y volumétrica y coeficiente de anisotropía; se determinaron también las correlaciones de Pearson entre las propiedades físicas. La densidad básica mayor fue 459 kg/m3, de la procedencia de Tournavista. Las densidades básica y relativa promedio fueron 430 kg/m3 y 0.45, respectivamente. Se encontró variación estadísticamente significativa (p ≤ 0.05) entre alturas en el fuste. La madera moderadamente densa y el coeficiente de anisotropía (1.56) sugieren que G. Crinita es una madera estable, lo que representa importantes ventajas en términos de costos por transporte y proceso de transformación. Debido a la variación encontrada en las limitadas muestras de árboles de este estudio, se recomienda la realización de más análisis con mayores muestras y de diferentes sitios y plantaciones.

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“…Positive correlations between growth traits at different ages suggest that early selection based on growth could be effective in this species, assuming of course that the growth traits are moderately heritable (Sotelo Montes et al, 2006;Weber et al, 2011). As others have reported (Lambeth, 1980;Riemenschneider, 1988;Matheson et al, 1994), correlations were generally stronger between two consecutive years (e.g.…”

Section: Discussionmentioning

confidence: 67%

Methodological approaches for the selection of genotypes in a progeny trial of <i>Dacryodes edulis</i> (G. Don) H. J. Lam in Cameroon

Thatchoua¹,

Tchoundjeu²,

Asaah³

et al. 2012

Int. J. Bio. Chem. Sci

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The World Agroforestry Centre (ICRAF) initiated a program in Cameroon for the selection of improved genotypes of Dacryodes edulis for domestication. There are major challenges in such selection because superior performance of individual trees may be based on site conditions rather than on genetic differences. Open-pollinated seeds were collected from mother trees in four provenances in Cameroon and planted in a progeny trial at Minkoameyos, Cameroon. Progeny from the same mother tree are referred to as family. After one year of growth in the field, growth traits were measured annually for five years and fruit traits were measured in two successive years. Three methodological approaches were investigated: family and within-family selection (combined selection), ranking for phenotypic selection and correlation for multi-trait and early selection. Variation in growth and fruit traits among families was not significant for most provenances, indicating that family selection would not be effective for the selection of genotypes in the trial. Phenotypic selection resulted in the retention of a small number of individuals of all families in the trial. There were strong positive correlations between fruit traits and between fruit and growth traits, while negative correlations were found between fruit traits and yield. The correlations indicate that selecting for one fruit trait may also improve the other fruit traits but reduce fruit yield. Positive and significant juvenile-mature correlations for growth were also found in this trial, indicating that early selection may be possible based on growth. Based on these results, phenotypic selection is recommended in the progeny trial for the domestication program in Cameroon and further research on early selection is needed as the trial advances in age.

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Genetic variation in tree growth, stem form and mortality of Guazuma crinita in slower- and faster-growing plantations in the Peruvian Amazon

Cited by 15 publications

References 18 publications

Genetic diversity in Guazuma crinita from eleven provenances in the Peruvian Amazon revealed by ISSR markers

Genetic diversity in Guazuma crinita from eleven provenances in the Peruvian Amazon revealed by ISSR markers

Variation in wood physical properties within stems of Guazuma crinita, a timber tree species in the Peruvian Amazon

Methodological approaches for the selection of genotypes in a progeny trial of <i>Dacryodes edulis</i> (G. Don) H. J. Lam in Cameroon

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