Several studies have quantified the responses of Eucalyptus globulus plantations to weed control ... more Several studies have quantified the responses of Eucalyptus globulus plantations to weed control on its early development (2-3 years after establishment). However, long-term results of competing vegetation effects have been rarely incorporated into growth and yield models that forecast the long-term effects of reducing the intensity of competing vegetation control and its interaction with site resource availability on stem volume production close to rotation age. We compared several models predicting stand stem volume yield of Eucalyptus globulus plantations established across a water and fertility gradient growing under different intensity levels of free area of competing vegetation maintained during the first 3 years of stand development. Four sites were selected encompassing a gradient in rainfall and amount of competing vegetation. Treatments were applied at stand establishment and were monitored periodically until age 9 years. Competing vegetation control intensity levels consi...
Protocols for Micropropagation of Woody Trees and Fruits, 2007
Most of pine trees do not reproduce naturally from sprouts. Reproduction from artificially rooted... more Most of pine trees do not reproduce naturally from sprouts. Reproduction from artificially rooted propagules of pines has been proved as a successful reproduction method in several countries. This leads us to two different ways to obtain artificial reproduction. Hedging method is used for mass-producing large number of symmetrical and straight cuttings and for maintaining the juvenile nature of propagules
The expression of defensive compounds derived from secondary metabolism in plants of Eucalyptus g... more The expression of defensive compounds derived from secondary metabolism in plants of Eucalyptus globulus Labill, and the persistence of these in vegetative propagation was evaluated by gas chromatography with flame ionization (GC-FID) and mass spectrometry (MS). The plants were induced by attack from the insect Ctenarytaina eucalypti ("blue gum psyllid") and by mechanical damage. Defense responses were activated in plants for the different types of tested induction. We identified four defensive compounds present in the leaves of plants induced in entomological form (beta-terpineol, aromadendrene, caryophyllene-oxide and eremophilene); all remained in the vegetative propagation. After mechanical induction, we identified three compounds (beta-terpineol, aromadendrene and ledol), of which ledol and aromadendrene persisted in the vegetative propagation. Virtually all the compounds detected, in addition to persisting in the vegetative propagation, showed specificity for the ind...
ABSTRACT Se analizó la duración del efecto revigorizante de podas severas de avellano europeo (Co... more ABSTRACT Se analizó la duración del efecto revigorizante de podas severas de avellano europeo (Corylus avellana L.) cv. Negretta adulto. Se evaluó la estimulación y la tasa de proliferación in vitro, sobre explantos resultantes de la estimulación de varetas obtenidas desde plantas adultas sin poda (T1), brotes epicórmicos de plantas sin poda (T2), plantas podadas una sola vez (T3) y plantas podadas dos veces (T4). En una primera etapa, se evaluó la respuesta a la estimulación climática utilizando varetas de entre 25 y 35 cm de largo y diámetros basales de entre 0,5 y 1,5 cm, obtenidas de plantas T1, T2, T3 y T4. En una segunda etapa, se evaluó la tasa de proliferación in vitro de explantos originados por la estimulación climática. Los resultados se analizaron mediante ANDEVA, utilizando un diseño completamente aleatorio. Se confirmó el efecto positivo de podas severas continuas sobre la capacidad morfogénica, siendo significativamente mayores para T2 y T4 (100 y 87,5% de estimulación, respectivamente). Las tasas de multiplicación in vitro fueron significativamente mayores en T2 y T4 (3,9 y 3,2 tallos nuevos por explanto, respectivamente), dejando de manifiesto que los brotes epicórmicos y podas severas cada dos años, son alternativas para la obtención de material vegetal adecuado para la multiplicación in vitro de esta especie. Además, se estableció que podar severamente no afecta significativamente la fisiología y desarrollo de explantos, y que el efecto revigorizante de las podas severas tiene una duración cercana a los dos años, siendo necesario considerar este tratamiento como una técnica fundamental para mantener el vigor de la especie.
Several studies have quantified the responses of Eucalyptus globulus plantations to weed control ... more Several studies have quantified the responses of Eucalyptus globulus plantations to weed control on its early development (2-3 years after establishment). However, long-term results of competing vegetation effects have been rarely incorporated into growth and yield models that forecast the long-term effects of reducing the intensity of competing vegetation control and its interaction with site resource availability on stem volume production close to rotation age. We compared several models predicting stand stem volume yield of Eucalyptus globulus plantations established across a water and fertility gradient growing under different intensity levels of free area of competing vegetation maintained during the first 3 years of stand development. Four sites were selected encompassing a gradient in rainfall and amount of competing vegetation. Treatments were applied at stand establishment and were monitored periodically until age 9 years. Competing vegetation control intensity levels consi...
Protocols for Micropropagation of Woody Trees and Fruits, 2007
Most of pine trees do not reproduce naturally from sprouts. Reproduction from artificially rooted... more Most of pine trees do not reproduce naturally from sprouts. Reproduction from artificially rooted propagules of pines has been proved as a successful reproduction method in several countries. This leads us to two different ways to obtain artificial reproduction. Hedging method is used for mass-producing large number of symmetrical and straight cuttings and for maintaining the juvenile nature of propagules
The expression of defensive compounds derived from secondary metabolism in plants of Eucalyptus g... more The expression of defensive compounds derived from secondary metabolism in plants of Eucalyptus globulus Labill, and the persistence of these in vegetative propagation was evaluated by gas chromatography with flame ionization (GC-FID) and mass spectrometry (MS). The plants were induced by attack from the insect Ctenarytaina eucalypti ("blue gum psyllid") and by mechanical damage. Defense responses were activated in plants for the different types of tested induction. We identified four defensive compounds present in the leaves of plants induced in entomological form (beta-terpineol, aromadendrene, caryophyllene-oxide and eremophilene); all remained in the vegetative propagation. After mechanical induction, we identified three compounds (beta-terpineol, aromadendrene and ledol), of which ledol and aromadendrene persisted in the vegetative propagation. Virtually all the compounds detected, in addition to persisting in the vegetative propagation, showed specificity for the ind...
ABSTRACT Se analizó la duración del efecto revigorizante de podas severas de avellano europeo (Co... more ABSTRACT Se analizó la duración del efecto revigorizante de podas severas de avellano europeo (Corylus avellana L.) cv. Negretta adulto. Se evaluó la estimulación y la tasa de proliferación in vitro, sobre explantos resultantes de la estimulación de varetas obtenidas desde plantas adultas sin poda (T1), brotes epicórmicos de plantas sin poda (T2), plantas podadas una sola vez (T3) y plantas podadas dos veces (T4). En una primera etapa, se evaluó la respuesta a la estimulación climática utilizando varetas de entre 25 y 35 cm de largo y diámetros basales de entre 0,5 y 1,5 cm, obtenidas de plantas T1, T2, T3 y T4. En una segunda etapa, se evaluó la tasa de proliferación in vitro de explantos originados por la estimulación climática. Los resultados se analizaron mediante ANDEVA, utilizando un diseño completamente aleatorio. Se confirmó el efecto positivo de podas severas continuas sobre la capacidad morfogénica, siendo significativamente mayores para T2 y T4 (100 y 87,5% de estimulación, respectivamente). Las tasas de multiplicación in vitro fueron significativamente mayores en T2 y T4 (3,9 y 3,2 tallos nuevos por explanto, respectivamente), dejando de manifiesto que los brotes epicórmicos y podas severas cada dos años, son alternativas para la obtención de material vegetal adecuado para la multiplicación in vitro de esta especie. Además, se estableció que podar severamente no afecta significativamente la fisiología y desarrollo de explantos, y que el efecto revigorizante de las podas severas tiene una duración cercana a los dos años, siendo necesario considerar este tratamiento como una técnica fundamental para mantener el vigor de la especie.
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