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Abstract:

Midday depressions in stomatal conductance (gs) and photosynthesis are common in plants. The aim of this study was to understand the hydraulic determinants of midday gs, the coordination between leaf and stem hydraulics and whether regulation of midday gs differed between deciduous and evergreen broadleaf tree species in a subtropical cloud forest of Southwest (SW) China. We investigated leaf and stem hydraulics, midday leaf and stem water potentials, as well as midday gs of co-occurring deciduous and evergreen tree species. Midday gs was correlated positively with midday stem water potential across both groups of species, but not with midday leaf water potential. Species with higher stem hydraulic conductivity and greater daily reliance on stem hydraulic capacitance were able to maintain higher stem water potential and higher gs at midday. Deciduous species exhibited significantly higher stem hydraulic conductivity, greater reliance on stem capacitance, higher stem water potential and gs at midday than evergreen species. Our results suggest that midday gs is more associated with midday stem than with leaf water status, and that the functional significance of stomatal regulation in these broadleaf tree species is probably for preventing stem xylem dysfunction. The aim of this study was to understand the hydraulic determinants of midday gs, the coordination between leaf and stem hydraulics, and whether regulation of midday gs differed between deciduous and evergreen broadleaf tree species in a subtropical cloud forest of SW China. Midday gs was correlated positively with midday stem water potential across both groups of species, but not with midday leaf water potential. Species with higher stem hydraulic conductivity and greater daily reliance on stem hydraulic capacitance were able to maintain higher stem water potential and higher gs at midday. Deciduous species exhibited significantly higher stem hydraulic conductivity, greater reliance on stem capacitance, higher stem water potential and gs at midday than evergreen species. © 2012 Blackwell Publishing Ltd.

Registro:

Documento: Artículo
Título:Midday stomatal conductance is more related to stem rather than leaf water status in subtropical deciduous and evergreen broadleaf trees
Autor:Zhang, Y.-J.; Meinzer, F.C.; Qi, J.-H.; Goldstein, G.; Cao, K.-F.
Filiación:Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla, Yunnan 666303, China
Department of Biology, University of Miami, PO Box 249118, Coral Gables, FL 33124, United States
Ailaoshan Station for Subtropical Forest Ecosystem Studies, Chinese Academy of Sciences, Jingdong 676200, China
Graduate University of Chinese Academy of Sciences, Beijing 100039, China
USDA Forest Service, Pacific Northwest Research Station, 3200 SW Jefferson Way, Corvallis, OR 97331, United States
Departamento de Ecologia, Genetica y Evolucion, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Nuñez, Buenos Aires, Argentina
Palabras clave:Leaf phenology; Midday depression in photosynthesis; Stem hydraulic capacitance; Stem water potential; Stomatal regulation; water; cloud forest; coexistence; deciduous tree; evergreen tree; hydraulic conductivity; photosynthesis; stomatal conductance; subtropical region; xylem; article; comparative study; photosynthesis; physiology; plant leaf; plant stem; plant stoma; tree; Photosynthesis; Plant Leaves; Plant Stems; Plant Stomata; Trees; Water; China
Año:2013
Volumen:36
Número:1
Página de inicio:149
Página de fin:158
DOI: http://dx.doi.org/10.1111/j.1365-3040.2012.02563.x
Título revista:Plant, Cell and Environment
Título revista abreviado:Plant Cell Environ.
ISSN:01407791
CODEN:PLCED
CAS:water, 7732-18-5; Water, 7732-18-5
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01407791_v36_n1_p149_Zhang

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Citas:

---------- APA ----------
Zhang, Y.-J., Meinzer, F.C., Qi, J.-H., Goldstein, G. & Cao, K.-F. (2013) . Midday stomatal conductance is more related to stem rather than leaf water status in subtropical deciduous and evergreen broadleaf trees. Plant, Cell and Environment, 36(1), 149-158.
http://dx.doi.org/10.1111/j.1365-3040.2012.02563.x
---------- CHICAGO ----------
Zhang, Y.-J., Meinzer, F.C., Qi, J.-H., Goldstein, G., Cao, K.-F. "Midday stomatal conductance is more related to stem rather than leaf water status in subtropical deciduous and evergreen broadleaf trees" . Plant, Cell and Environment 36, no. 1 (2013) : 149-158.
http://dx.doi.org/10.1111/j.1365-3040.2012.02563.x
---------- MLA ----------
Zhang, Y.-J., Meinzer, F.C., Qi, J.-H., Goldstein, G., Cao, K.-F. "Midday stomatal conductance is more related to stem rather than leaf water status in subtropical deciduous and evergreen broadleaf trees" . Plant, Cell and Environment, vol. 36, no. 1, 2013, pp. 149-158.
http://dx.doi.org/10.1111/j.1365-3040.2012.02563.x
---------- VANCOUVER ----------
Zhang, Y.-J., Meinzer, F.C., Qi, J.-H., Goldstein, G., Cao, K.-F. Midday stomatal conductance is more related to stem rather than leaf water status in subtropical deciduous and evergreen broadleaf trees. Plant Cell Environ. 2013;36(1):149-158.
http://dx.doi.org/10.1111/j.1365-3040.2012.02563.x