Functional anatomy of juvenile wood of Pinus taeda L: genotypic variability and anatomical plasticity in response to water deficit
Pinus taeda L. achieves high growth rates in the Northeastern region of Argentina, South-America. However, according to that reported for other tree species, both gymnosperms and broadleaves, there may be a tradeoff between productivity and resistance to water deficit, mediated by differences in wood anatomical characteristics that determine the efficiency of water conduction -driving maximum growth- and xylem vulnerability to cavitation – associated to resistance to water deficit. The objective of this study was to analyze the relationships between wood anatomy, wood density and functionality in different genotypes of P. taeda of contrasting growth rate (high (AC) and low (BC)) under optimal and deficit water conditions. Under greenhouse conditions, two treatments of water deficit (moderate and severe) and a control were applied. Measurements of lumen diameter and wall thickness of tracheids, proportion of early and latewood, and wood density were carried out. Curves describing vulnerability to cavitation and estimation of the theoretical specific hydraulic conductivity (ksT) were performed. Genotypes differed in their growth (AC>BC) under optimal water conditions, presenting no significant differences in the morphometry of individual cells but differences in the proportion of early and latewood. Genotype BC1 was the only presenting a lower vulnerability to cavitation (P50 = -2.1 vs. -1.7 Mpa than the other ones, p <0.05). Under water deficit the cell level variables were unchanged, however latewood proportion did increase with no significant impact on ksT. We concluded that at the xylem level, the proportion of early and latewood within the growth ring is the most variable trait both genotypic and phenotypically in response to water deficit. No tradeoff between xylem efficiency and safety was observed in the studied genotypes.
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Facultad de Ciencias Agrarias y Forestales de la Universidad Nacional de La Plata
2018
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Bulfe, Nardia Maria Luján Fernández, María Elena |
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Bulfe, Nardia Maria Luján Fernández, María Elena Functional anatomy of juvenile wood of Pinus taeda L: genotypic variability and anatomical plasticity in response to water deficit |
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Bulfe, Nardia Maria Luján Fernández, María Elena |
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Bulfe, Nardia Maria Luján |
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Functional anatomy of juvenile wood of Pinus taeda L: genotypic variability and anatomical plasticity in response to water deficit |
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Functional anatomy of juvenile wood of Pinus taeda L: genotypic variability and anatomical plasticity in response to water deficit |
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Functional anatomy of juvenile wood of Pinus taeda L: genotypic variability and anatomical plasticity in response to water deficit |
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Functional anatomy of juvenile wood of Pinus taeda L: genotypic variability and anatomical plasticity in response to water deficit |
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Functional anatomy of juvenile wood of Pinus taeda L: genotypic variability and anatomical plasticity in response to water deficit |
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functional anatomy of juvenile wood of pinus taeda l: genotypic variability and anatomical plasticity in response to water deficit |
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Pinus taeda L. achieves high growth rates in the Northeastern region of Argentina, South-America. However, according to that reported for other tree species, both gymnosperms and broadleaves, there may be a tradeoff between productivity and resistance to water deficit, mediated by differences in wood anatomical characteristics that determine the efficiency of water conduction -driving maximum growth- and xylem vulnerability to cavitation – associated to resistance to water deficit. The objective of this study was to analyze the relationships between wood anatomy, wood density and functionality in different genotypes of P. taeda of contrasting growth rate (high (AC) and low (BC)) under optimal and deficit water conditions. Under greenhouse conditions, two treatments of water deficit (moderate and severe) and a control were applied. Measurements of lumen diameter and wall thickness of tracheids, proportion of early and latewood, and wood density were carried out. Curves describing vulnerability to cavitation and estimation of the theoretical specific hydraulic conductivity (ksT) were performed. Genotypes differed in their growth (AC>BC) under optimal water conditions, presenting no significant differences in the morphometry of individual cells but differences in the proportion of early and latewood. Genotype BC1 was the only presenting a lower vulnerability to cavitation (P50 = -2.1 vs. -1.7 Mpa than the other ones, p <0.05). Under water deficit the cell level variables were unchanged, however latewood proportion did increase with no significant impact on ksT. We concluded that at the xylem level, the proportion of early and latewood within the growth ring is the most variable trait both genotypic and phenotypically in response to water deficit. No tradeoff between xylem efficiency and safety was observed in the studied genotypes. |
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Facultad de Ciencias Agrarias y Forestales de la Universidad Nacional de La Plata |
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2018 |
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https://revistas.unlp.edu.ar/revagro/article/view/6177 |
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AT bulfenardiamarialujan functionalanatomyofjuvenilewoodofpinustaedalgenotypicvariabilityandanatomicalplasticityinresponsetowaterdeficit AT fernandezmariaelena functionalanatomyofjuvenilewoodofpinustaedalgenotypicvariabilityandanatomicalplasticityinresponsetowaterdeficit AT bulfenardiamarialujan anatomiafuncionaldellenojuvenildepinustaedalvariabilidadgenotipicayplasticidadanatomicaantedeficithidrico AT fernandezmariaelena anatomiafuncionaldellenojuvenildepinustaedalvariabilidadgenotipicayplasticidadanatomicaantedeficithidrico |
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rev-revagro-ar-article-61772019-11-16T18:35:50Z Functional anatomy of juvenile wood of Pinus taeda L: genotypic variability and anatomical plasticity in response to water deficit Anatomía funcional del leño juvenil de Pinus taeda L: variabilidad genotípica y plasticidad anatómica ante déficit hídrico Bulfe, Nardia Maria Luján Fernández, María Elena leño temprano leño tardío vulnerabilidad a la cavitación anillo de crecimiento densidad de madera earlywood latewood xylem vulnerability to cavitation growth ring wood density Pinus taeda L. achieves high growth rates in the Northeastern region of Argentina, South-America. However, according to that reported for other tree species, both gymnosperms and broadleaves, there may be a tradeoff between productivity and resistance to water deficit, mediated by differences in wood anatomical characteristics that determine the efficiency of water conduction -driving maximum growth- and xylem vulnerability to cavitation – associated to resistance to water deficit. The objective of this study was to analyze the relationships between wood anatomy, wood density and functionality in different genotypes of P. taeda of contrasting growth rate (high (AC) and low (BC)) under optimal and deficit water conditions. Under greenhouse conditions, two treatments of water deficit (moderate and severe) and a control were applied. Measurements of lumen diameter and wall thickness of tracheids, proportion of early and latewood, and wood density were carried out. Curves describing vulnerability to cavitation and estimation of the theoretical specific hydraulic conductivity (ksT) were performed. Genotypes differed in their growth (AC>BC) under optimal water conditions, presenting no significant differences in the morphometry of individual cells but differences in the proportion of early and latewood. Genotype BC1 was the only presenting a lower vulnerability to cavitation (P50 = -2.1 vs. -1.7 Mpa than the other ones, p <0.05). Under water deficit the cell level variables were unchanged, however latewood proportion did increase with no significant impact on ksT. We concluded that at the xylem level, the proportion of early and latewood within the growth ring is the most variable trait both genotypic and phenotypically in response to water deficit. No tradeoff between xylem efficiency and safety was observed in the studied genotypes. Pinus taeda L. alcanza altas tasas de crecimiento en la región del Noreste de Argentina, Sudamérica. Se han reportado para otras especies, arbóreas en general, compromisos entre su productividad y su resistencia al déficit hídrico. Estos estarían mediados por diferencias en caracteres anatómicos de la madera que determinan la eficiencia de conducción de agua –relacionada con el crecimiento- y la vulnerabilidad a la cavitación –asociada a la resistencia al déficit hídrico. El objetivo del trabajo fue analizar las relaciones entre anatomía del leño, densidad de madera y su funcionalidad en diferentes progenies de P. taeda con tasas de crecimiento contrastantes (alto (AC) y bajo (BC)) en condiciones óptimas y bajo déficit hídrico. En invernáculo, se aplicaron dos tratamientos de déficit hídrico (moderado y severo) y un testigo. Se midió el diámetro y espesor de pared de las traqueidas, la proporción de leño temprano y tardío, y la densidad de madera. Se realizaron curvas de vulnerabilidad a la cavitación del xilema y se estimó la conductividad hidráulica específica teórica. Bajo condiciones hídricas óptimas las progenies difirieron en crecimiento absoluto en altura (BC>AC), sin diferencias significativas en la morfometría de células individuales del leño, sin embargo manifestando a nivel de tejido diferencias en las proporciones de leño temprano y tardío. Tanto la funcionalidad como la seguridad del sistema conductivo fueron iguales para todas las progenies. La progenie BC1 presentó mayor resistencia a la cavitación (P50= -2,1 MPa vs. P50= -1,7 en las restantes, p<0,05). El déficit hídrico no modificó la morfometría celular, sin embargo, aumentó la proporción de leño tardío sin redundar significativamente en la conductividad hidráulica. Se concluye que a nivel de xilema, la proporción de tipos de leño dentro del anillo es la característica más variable genotípicamente y más plástica ante cambios en la disponibilidad hídrica. No se observaron compromisos entre eficiencia de conducción y vulnerabilidad a la cavitación en los genotipos analizados. Facultad de Ciencias Agrarias y Forestales de la Universidad Nacional de La Plata 2018-11-15 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artículo evaluado por pares Peer reviewed article application/pdf https://revistas.unlp.edu.ar/revagro/article/view/6177 Journal of the Agronomy College; Vol. 116 No. 2 (2017): Revista de la Facultad de Agronomía Revista de la Facultad de Agronomía; Vol. 116 Núm. 2 (2017): Revista de la Facultad de Agronomía Journal de la Faculté d'Agronomie; Vol. 116 No. 2 (2017): Revista de la Facultad de Agronomía Revista da Faculdade de Agronomia; v. 116 n. 2 (2017): Revista de la Facultad de Agronomía 1669-9513 0041-8676 spa https://revistas.unlp.edu.ar/revagro/article/view/6177/5117 Derechos de autor 2018 Nardia Maria Luján Bulfe, María Elena Fernández |