Water relations of Chusquea ramosissima and Merostachys claussenii in Iguazu National Park, Argentina

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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...

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Autores principales:	Saha, S., Holbrook, N.M., Montti, L., Goldstein, G., Cardinot, G.K.
Formato:	Artículo publishedVersion
Publicado:	2009
Materias:	chlorophyll water Argentina article circadian rhythm climate drought environmental protection fluorescence metabolism physiology plant root plant stoma Poaceae pressure xylem Chlorophyll Circadian Rhythm Climate Conservation of Natural Resources Droughts Fluorescence Plant Roots Plant Stomata Pressure Water Xylem Bambusa Chusquea ramosissima Merostachys
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_00320889_v149_n4_p1992_Saha https://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_00320889_v149_n4_p1992_Saha_oai
Aporte de:	Repositorio Digital de la Universidad de Buenos Aires (UBA) de Universidad de Buenos Aires

id	I28-R145-paper_00320889_v149_n4_p1992_Saha_oai
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spelling	I28-R145-paper_00320889_v149_n4_p1992_Saha_oai2024-08-16 Saha, S. Holbrook, N.M. Montti, L. Goldstein, G. Cardinot, G.K. 2009 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. Fil:Montti, L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Goldstein, G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. application/pdf http://hdl.handle.net/20.500.12110/paper_00320889_v149_n4_p1992_Saha info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar Plant Physiol. 2009;149(4):1992-1999 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 Water relations of Chusquea ramosissima and Merostachys claussenii in Iguazu National Park, Argentina info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion https://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_00320889_v149_n4_p1992_Saha_oai
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-145
collection	Repositorio Digital de la Universidad de Buenos Aires (UBA)
topic	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
spellingShingle	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 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
topic_facet	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
description	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.
format	Artículo Artículo publishedVersion
author	Saha, S. Holbrook, N.M. Montti, L. Goldstein, G. Cardinot, G.K.
author_facet	Saha, S. Holbrook, N.M. Montti, L. Goldstein, G. Cardinot, G.K.
author_sort	Saha, S.
title	Water relations of Chusquea ramosissima and Merostachys claussenii in Iguazu National Park, Argentina
title_short	Water relations of Chusquea ramosissima and Merostachys claussenii in Iguazu National Park, Argentina
title_full	Water relations of Chusquea ramosissima and Merostachys claussenii in Iguazu National Park, Argentina
title_fullStr	Water relations of Chusquea ramosissima and Merostachys claussenii in Iguazu National Park, Argentina
title_full_unstemmed	Water relations of Chusquea ramosissima and Merostachys claussenii in Iguazu National Park, Argentina
title_sort	water relations of chusquea ramosissima and merostachys claussenii in iguazu national park, argentina
publishDate	2009
url	http://hdl.handle.net/20.500.12110/paper_00320889_v149_n4_p1992_Saha https://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_00320889_v149_n4_p1992_Saha_oai
work_keys_str_mv	AT sahas waterrelationsofchusquearamosissimaandmerostachysclausseniiiniguazunationalparkargentina AT holbrooknm waterrelationsofchusquearamosissimaandmerostachysclausseniiiniguazunationalparkargentina AT monttil waterrelationsofchusquearamosissimaandmerostachysclausseniiiniguazunationalparkargentina AT goldsteing waterrelationsofchusquearamosissimaandmerostachysclausseniiiniguazunationalparkargentina AT cardinotgk waterrelationsofchusquearamosissimaandmerostachysclausseniiiniguazunationalparkargentina
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Water relations of Chusquea ramosissima and Merostachys claussenii in Iguazu National Park, Argentina

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