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Abstract:

Bamboos are prominent components of many tropical ecosystems, yet little is known about the physiological mechanisms utilized by these gigantic forest grasses. Here, we present data on the water transport properties of Chusquea ramosissima and Merostachys claussenii, monocarpic bamboo grasses native to the subtropical Atlantic forests of Argentina. C. ramosissima and M. claussenii differed in their growth form and exhibited contrasting strategies of water transport. Maximum xylem hydraulic conductivity of C. ramosissima culms was 2-fold higher than that of M. claussenii. C. ramosissima cavitated at relatively high water potentials (50% loss of conductivity at ≥1 MPa), whereas M. claussenii was more drought tolerant (50% loss at ≤3 MPa). Both species exhibited significant loss of hydraulic conductivity during the day, which was reversed overnight due to the generation of root pressure. The photosynthetic capacities of both bamboo species, estimated based on electron transport rates, were moderate, reflecting both the large amount of leaf area supported by culms and diurnal loss of hydraulic conductivity due to cavitation. Leaf hydraulic conductance was also relatively low for both species, congruent with their modest photosynthetic capacities. Within its native range, C. ramosissima is highly invasive due to its ability to colonize and persist in both forest gaps and land cleared for agriculture. We propose that a highly vulnerable vasculature, coupled with diurnal root pressure and an allometry that allows substantial leaf area to be supported on relatively slender culms, are key traits contributing to the ecological success of C. ramosissima. © 2009 American Society of Plant Biologists.

Registro:

Documento: Artículo
Título:Water relations of Chusquea ramosissima and Merostachys claussenii in Iguazu National Park, Argentina
Autor:Saha, S.; Holbrook, N.M.; Montti, L.; Goldstein, G.; Cardinot, G.K.
Filiación:Arnold Arboretum of Harvard University, Cambridge, MA 02130, United States
Biological Laboratories, Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, MA 02138, United States
Laboratorio de Ecologia Funcional, Departamento de Ecología Genética y Evolución, Facultad de Ciencias Exactas y Naturales, C1428EHA Buenos Aires, Argentina
Instituto de Pesquisa Ambiental da Amazônia, Canarana, MT 78640-000, Brazil
Institute for Regional Conservation, 22601 SW 152nd Ave., Miami, FL 33170, United States
Consejo Nacional de Investigaciones Cientificas y Técnicas, C1428EHA Buenos Aires, Argentina
Palabras clave:chlorophyll; water; Argentina; article; circadian rhythm; climate; drought; environmental protection; fluorescence; metabolism; physiology; plant root; plant stoma; Poaceae; pressure; xylem; Argentina; Chlorophyll; Circadian Rhythm; Climate; Conservation of Natural Resources; Droughts; Fluorescence; Plant Roots; Plant Stomata; Poaceae; Pressure; Water; Xylem; Bambusa; Chusquea ramosissima; Merostachys; Poaceae
Año:2009
Volumen:149
Número:4
Página de inicio:1992
Página de fin:1999
DOI: http://dx.doi.org/10.1104/pp.108.129015
Título revista:Plant Physiology
Título revista abreviado:Plant Physiol.
ISSN:00320889
CODEN:PLPHA
CAS:chlorophyll, 1406-65-1, 15611-43-5; water, 7732-18-5; Chlorophyll, 1406-65-1; Water, 7732-18-5
PDF:https://bibliotecadigital.exactas.uba.ar/download/paper/paper_00320889_v149_n4_p1992_Saha.pdf
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00320889_v149_n4_p1992_Saha

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Citas:

---------- APA ----------
Saha, S., Holbrook, N.M., Montti, L., Goldstein, G. & Cardinot, G.K. (2009) . Water relations of Chusquea ramosissima and Merostachys claussenii in Iguazu National Park, Argentina. Plant Physiology, 149(4), 1992-1999.
http://dx.doi.org/10.1104/pp.108.129015
---------- CHICAGO ----------
Saha, S., Holbrook, N.M., Montti, L., Goldstein, G., Cardinot, G.K. "Water relations of Chusquea ramosissima and Merostachys claussenii in Iguazu National Park, Argentina" . Plant Physiology 149, no. 4 (2009) : 1992-1999.
http://dx.doi.org/10.1104/pp.108.129015
---------- MLA ----------
Saha, S., Holbrook, N.M., Montti, L., Goldstein, G., Cardinot, G.K. "Water relations of Chusquea ramosissima and Merostachys claussenii in Iguazu National Park, Argentina" . Plant Physiology, vol. 149, no. 4, 2009, pp. 1992-1999.
http://dx.doi.org/10.1104/pp.108.129015
---------- VANCOUVER ----------
Saha, S., Holbrook, N.M., Montti, L., Goldstein, G., Cardinot, G.K. Water relations of Chusquea ramosissima and Merostachys claussenii in Iguazu National Park, Argentina. Plant Physiol. 2009;149(4):1992-1999.
http://dx.doi.org/10.1104/pp.108.129015