scholarly journals Análisis de Germinación de Semillas de Eucalyptus nitens Tratadas con Radiación Gamma: Indicios de Efecto Hormético

2021 ◽  
Vol 27 (3) ◽  
pp. 7-16
Author(s):  
Braulio Gutiérrez ◽  
Laura Koch ◽  
Daniel Villegas ◽  
Jorge Gonzalez ◽  
Doris Ly ◽  
...  
Keyword(s):  
Eucalyptus Nitens

Se analiza un ensayo de germinación en laboratorio para evaluar el efecto de cinco dosis de radiación gamma (10, 20, 30, 40 y 50 Gy) más un testigo sin irradiar, sobre los parámetros capacidad de germinación (CG), energía germinativa (EG) y periodo de energía (PE) de semillas de Eucalyptus nitens.  Se concluye la existencia de un efecto significativo de radio-hórmesis asociado al tratamiento de 10 Gy, el cual aumenta la capacidad germinativa respecto al testigo sin irradiar.  Ninguno de los tratamientos restantes resulta diferente al testigo en capacidad germinativa, energía germinativa ni periodo de energía. Se comparan los resultados con los registrados en la bibliografía y se plantean recomendaciones para estudios posteriores en esta materia.

scholarly journals Efecto del raleo en el crecimiento y algunas propiedades de la madera de Eucalyptus nitens en una plantación de 15 años

2012 ◽  
pp. 0-0 ◽  
Author(s):  
Sandro Díaz Bravo ◽  
Miguel Espinosa ◽  
Luis Valenzuela ◽  
Jorge Cancino ◽  
Jean P Lasserre
Keyword(s):  
Eucalyptus Nitens

Dinucleotide microsatellites from Eucalyptus sieberi: inheritance, diversity, and improved scoring of single-base differences

Genome ◽  
2001 ◽  
Vol 44 (6) ◽  
pp. 1041-1045 ◽  
Author(s):  
J C Glaubitz ◽  
L C Emebiri ◽  
G F Moran
Keyword(s):  
Base Pair ◽  
Mendelian Inheritance ◽  
Null Alleles ◽  
Fixation Index ◽  
Eucalyptus Nitens ◽  
Internal Reference ◽  
Single Base ◽  
Hardy Weinberg Equilibrium ◽  
Single Base Pair ◽  
Flanking Regions

Eight dinucleotide microsatellites were developed in Eucalyptus sieberi L. Johnson (silvertop ash), a member of the subgenus Eucalyptus. Transfer of six of these to the subgenus Symphyomyrtus and their Mendelian inheritance are demonstrated using a full-sib cross in Eucalyptus nitens. Genetic diversity parameters are presented for the eight loci based on a sample of 100 old-growth E. sieberi trees from a single natural stand. One locus, Es266, had an atypically high fixation index, and significantly deviated from Hardy-Weinberg equilibrium genotypic proportions, indicating the likely presence of null alleles. Two of the loci, Es076 and Es140, had many alleles that differed in size by only a single base pair, possibly because of short poly(A) or poly(T) stretches in their flanking regions. These two loci were by far the most polymorphic, but were difficult to score reliably on a capillary DNA sequencer. Reliability of scoring of these two one-base microsatellite loci was markedly improved by the incorporation of internal reference alleles into each sample analysed.Key words: SSRs, single base pair alleles, null alleles, internal reference alleles.

scholarly journals Initial defence responses in sapwood of Eucalyptus nitens(Maiden) following wounding and fungal inoculation

2001 ◽  
Vol 58 (2) ◽  
pp. 63-72 ◽  
Author(s):  
K.M. Barry ◽  
R.B. Pearce ◽  
S.D. Evans ◽  
L.D. Hall ◽  
C.M. Mohammed
Keyword(s):  
Eucalyptus Nitens ◽  
Defence Responses ◽  
Fungal Inoculation

On the selection of samples for multivariate regression analysis: application to near-infrared (NIR) calibration models for the prediction of pulp yield in Eucalyptus nitens

2008 ◽  
Vol 38 (10) ◽  
pp. 2626-2634 ◽  
Author(s):  
Christian R. Mora ◽  
Laurence R. Schimleck
Keyword(s):  
Spectral Data ◽  
Computer Aided Design ◽  
Near Infrared ◽  
Cross Validation ◽  
Sample Selection ◽  
Pulp Yield ◽  
Eucalyptus Nitens ◽  
Calibration Models ◽  
Calibration Sets ◽  
Measured Property

The effects of using reduced calibration sets on the development of near-infrared (NIR) calibration models for the prediction of kraft pulp yield in Eucalyptus nitens (Dean & Maiden) Maiden trees were explored. Three selection techniques based on NIR spectral data (CADEX (computer-aided design of experiments), DUPLEX, and SELECT algorithms) and one selection method based on a measured property (RANKING algorithm) were used for analysis and compared against a model using all data. The effect of using calibration sets of different sizes was also evaluated. All sample-selection methods resulted in models of similar performance compared with the model fitted using all samples. For calibration purposes, RANKING selection resulted in models with the lowest errors of cross-validation, followed by the DUPLEX, CADEX, and SELECT methods. In terms of validation, the SELECT and CADEX methods resulted in lower errors of prediction compared with the DUPLEX and RANKING algorithms. In general, cross-validation and prediction errors decreased as the number of calibration samples increased. These results show that it is possible to obtain adequate NIR calibration models with a reduced number of samples allowing the remaining samples to be used for model validation and that sample selection based on NIR spectral data alone is as successful as selection based on a measured property.

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