Physiological responses to water stress in Eucalyptus cloeziana and E. argophloia seedlings

Ngugi, Michael R.; Doley, David; Hunt, Mark; Ryan, Paul; Dart, P. J.

doi:10.1007/s00468-003-0316-5

Cited by 41 publications

(37 citation statements)

References 37 publications

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“…variegata and E. amplifolia, show that the variation within the species (different provenances) was similar or higher than the variation among species. Significant intra-specific variation in these traits is commonly observed in eucalypts [12,32]. This variation in widespread species is more often related to the provenance's environmental conditions [12,13] than traits specific to the species.…”

Section: Discussionmentioning

confidence: 99%

“…Significant intra-specific variation in these traits is commonly observed in eucalypts [12,32]. This variation in widespread species is more often related to the provenance's environmental conditions [12,13] than traits specific to the species. Hence, plants sourced from areas with high water stress are generally more drought-tolerant, however they are likely to be less responsive under well-watered conditions showing lower production [5].…”

Section: Discussionmentioning

confidence: 99%

“…Ngugi et al [12] studied the effects of duration and intensity of water stress on gas exchange and leaf water potential in E. cloeziana F. Muel from humid (Gympie) and dry regions (Hungry Hills), and E. argophloia Blakely from dry region (Chinchilla). They found that E. argophloia showed a higher net photosynthetic rate and stomatal conductance than both provenances of E. cloeziana.…”

Section: Introductionmentioning

confidence: 99%

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Seedling Growth and Physiological Responses of Sixteen Eucalypt Taxa under Controlled Water Regime

Silva

Campoe

Paula³

et al. 2016

Forests

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Abstract:We assessed growth and physiological responses of Eucalyptus and Corymbia species to water limitation aiming to widen possibilities for plantations in dry climatic conditions. We selected 16 taxa: 4 Corymbia and 12 Eucalyptus species from the Subgenera Symphyomyrtus. Seedlings were evaluated from 100 to 170 days after sowing. Growth and physiological traits showed significant differences among taxa and between two levels of water availability. Water limitation significantly impacted biomass production and physiological characteristics, however in different levels. Leaf area and biomass production decreased 15%-48% under water limitation among taxa. Eucalyptus moluccana, CCV 2, and VM1 (drought tolerant clone) showed the largest decrease in leaf area. Transpiration across taxa decreased 30%-57% and photosynthesis 14%-48% under water limited condition. Taxa from cold environments were less responsive in leaf area reduction under water limitation, and taxa from Exsertaria section showed lower reduction in photosynthesis (E. camaldulensis showed the lowest reduction). Responses to water limitation are related to the environment of origin. E. molucana, the only Adnataria species from a high precipitation region (>1500 mm year´1), was one of the most sensitive in reduction of biomass production, different behavior from the other Adnataria species, originated in regions with rainfall <750 mm year´1. Water limitation increased leaf-level water use efficiency by 18% on average, 8% in E. longirostrata, and 28% in E. camaldulensis, E. brassiana, and E. crebra. Growth and physiological responses observed show the potential of different eucalypts taxa to tolerate water limited environments.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Seedling Growth and Physiological Responses of Sixteen Eucalypt Taxa under Controlled Water Regime

Silva

Campoe

Paula³

et al. 2016

Forests

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“…ex Trautv. El efecto del agua en la tasa de fotosíntesis y conductancia estomática fue estudiado por Ngugi et al (2003Ngugi et al ( , 2004, determinando para las especies Eucalyptus argophloia Blakely y E. cloeziana F. Muell. altas tasa de fotosíntesis (13,4 y 7,8 μmol CO₂/ m²/seg) y conductancia estomática (194,3 y 70,5 mmol H 2 O/m²/seg), respectivamente, en presencia de 100% de contenido humedad del suelo.…”

Section: Introductionunclassified

Intercambio gaseoso de dos clones de Paulownia elongata x fortunei al primer año de desarrollo vegetativo en tres sitios del centro-sur de Chile

et al. 2016

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Intercambio gaseoso de dos clones de Paulownia elongata × fortunei al primer año de desarrollo vegetativo en tres sitios del centro-sur de ChileGas exchange of two clones of Paulownia elongata × fortunei at the first year of vegetative growth at three sites of the south-central Chile RESUMENLas especies del género Paulownia (Paulowniaceae) presentan alta tasa de asimilación de CO 2 y eficiente utilización de flujos de fotones fotosintéticos (PPFD), lo que les permite alcanzar altas tasas de crecimiento. Se investigó la respuesta de intercambio gaseoso, al primer año de desarrollo vegetativo, de dos clones de Paulownia elongata × fortunei establecidos en tres sitios de condiciones edafoclimáticas diferentes (Trehualemu, El Vergel y La Isla) ubicados en las Regiones del Maule y del Biobío, en Chile central. El intercambio gaseoso se midió mensualmente en seis hojas (de plantas diferentes) por clon por sitio, utilizando PPFD de 1500 ± μmol fotones/m²/s, determinando fotosíntesis neta (An), transpiración (E), conductancia estomática (Gs) y eficiencia instantánea en uso del agua (WUE) calculada como la relación An/E. La respuesta fotosintética neta (A) a PPFD de 2400, 1500, 1200, 900, 750, 400, 150, 100 y 0 μmol fotones/m²/s se midió mensualmente en una hoja de una planta por clon por sitio utilizando equipo IRGA. Con el conjunto de pares de datos (A, PPFD) obtenidos para cada sitio, clon y mes, se ajustaron curvas de luz. Para determinar diferencias significativas entre clones, se compararon los parámetros obtenidos del ajuste. Como resultado se determinó que, dependiendo del sitio y clon, al mes último de medición, alta respuesta fotosintética neta (A) entre 19,7 y 33,4 μmol CO₂/m²/s fueron alcanzadas a los 2400 μmol fotones/m²/s, no encontrándose saturación lumínica (A sat ), obteniéndose a la vez puntos de compensación entre 96 y 69 μmol fotones/m²/s (cuando A = 0), respectivamente, indicando que la alta intensidad de radiación es un factor ambiental importante en la regulación de la fotosíntesis de los clones estudiados. El análisis de varianza del intercambio gaseoso evidenció presencia de interacción sitio × clon en An, Gs y E, no así en WUE; alcanzando en sitios con mayor contenido de agua (CH) valores máximos de An entre 17,1 y 21,3 μmol CO 2 /m²/s con diferencias no significativas entre clones, en comparación al sitio con menor CH que presenta valores de An entre 12,4 y 19,2 μmol CO 2 /m²/s, difiriendo significativamente entre clon. Los cambios de An son afectados significativamente por Gs y E. Los parámetros del modelo ajustado con los datos de A/PPFD, no presentaron diferencias significativas entre clones en sitios con mejores condiciones edafoclimáticas, en especial, mayor contenido de agua disponible en el suelo para las plantas. Se determina que para establecer cultivos de estos clones en Chile es necesario la selección de sitios que presenten condiciones edafoclimáticas similares al sitio El Vergel. PALABRAS CLAVE:Respuesta fisiológica, fotosíntesis, curva de luz, Paulowniaceae. ABSTRACTThe species o...

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“…Several workers have reported provenance variation in gas exchange parameters in various indigenous fruit trees (Benowicza et al, 2001, Lanter, et al, 1997, Miguel et al, 2000, Ngugi et al, 2004, Benowicza et al, 1999, Benwicza et al 2000, Zhang et al, 2005, Luoma 1997). These variations have been due to genotypex environmental interactions (Benowicza et al, 2001), different climatic adaptations (Lanter, et al, 1997, genetic variations in rubulose bisphosphate carboxylase (RUBP), chlorophyll, leaf soluble protein and thickness (Lanter, et al, 1997), low values of carbon isotope discrimination among provenances due to low values of intercellular CO 2 partial pressure and low mesophull conductance causing reduced CO 2 partial pressure (Lanter, et al, 1997), reduction of photosynthesis due to low moisture availability which causes low carbon isotope discrimination (Miguel et al, 2000, Ngugi et al, 2004, genetic variation in adaptive attributes (Benowicza et al, 1999), variation in light (Luoma, 1997), water (Zhang et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Provenance variation of photosynthesis of seedlings of java plum (S. cuminii) in Western Kenya

Okuto¹,

Ouma²

2010

ABJNA

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Studies were conducted at Maseno University, Kenya to investigate provenance variation of gas exchange characteristics of S. cuminii such as stomatal conductance, photosynthesis and transpiration rates of its seedlings from three districts of Kenya namely Vihiga, Kisumu and Siaya. The studies were conducted in the years 2004 and 2005. Seeds were obtained from the fruits of S. cuminii from the three districts above using standard methods and grown in polythene pots. and watered daily two times, in the morning and evening in the pots placed in polythene-covered structures at the Kenya Forestry Research Centre nurseries at Maseno, Kenya. The experimental design was completely randomized replicated four times. When the seedlings were one month old, gas exchange parameters were determined on mature exposed leaves using an Infra Red Gas Analysis (Ciras, PP Systems, Stortfield, Hitchin, Herts, U.K) five weeks on four seedlings per plant chosen at random from each replicate. Statistical analysis was carried out on the data obtained using Analysis of Variance (ANOVA) and mean separation using the Least Significant Different Method (L.S.D). The results showed that the trends in decreasing order for photosynthetic rates were Vihiga, Kisumu and Siaya. Stomatal conductance was similar for Kisumu and Siaya but was higher than Vihiga. Transpiration rates were highest in Vihiga followed by Siaya and Kisumu provenances. The parameters decreased with age up to 56 days after transplanting then increased and peaked at 84 days after transplanting for stomatal conductance and transpiration rate and at 112 days for photosynthetic rates. It is concluded that the gas exchange parameters varied among provenances and with age of seedlings after transplanting.

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Physiological responses to water stress in Eucalyptus cloeziana and E. argophloia seedlings

Cited by 41 publications

References 37 publications

Seedling Growth and Physiological Responses of Sixteen Eucalypt Taxa under Controlled Water Regime

Seedling Growth and Physiological Responses of Sixteen Eucalypt Taxa under Controlled Water Regime

Intercambio gaseoso de dos clones de Paulownia elongata x fortunei al primer año de desarrollo vegetativo en tres sitios del centro-sur de Chile

Provenance variation of photosynthesis of seedlings of java plum (S. cuminii) in Western Kenya

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