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Abstract:

Despite considerable investigations of diurnal water use characteristics in different plant functional groups, the research on daily water use strategies of woody bamboo grasses remains lacking. We studied the daily water use and gas exchange of Sinarundinaria nitida (Mitford) Nakai, an abundant subtropical bamboo species in Southwest China. We found that the stem relative water content (RWC) and stem hydraulic conductivity (Ks) of this bamboo species did not decrease significantly during the day, whereas the leaf RWC and leaf hydraulic conductance (Kleaf) showed a distinct decrease at midday, compared with the predawn values. Diurnal loss of Kleaf was coupled with a midday decline in stomatal conductance (gs) and CO2 assimilation. The positive root pressures in the different habitats were of sufficient magnitude to refill the embolisms in leaves. We concluded that (i) the studied bamboo species does not use stem water storage for daily transpiration; (ii) diurnal down-regulation in Kleaf and gs has the function to slow down potential water loss in stems and protect the stem hydraulic pathway from cavitation; (iii) since Kleaf did not recover during late afternoon, refilling of embolism in bamboo leaves probably fully depends on nocturnal root pressure. The embolism refilling mechanism by root pressure could be helpful for the growth and persistence of this woody monocot species. © 2012 The Author.

Registro:

Documento: Artículo
Título:Recovery of diurnal depression of leaf hydraulic conductance in a subtropical woody bamboo species: Embolism refilling by nocturnal root pressure
Autor:Yang, S.-J.; Zhang, Y.-J.; Sun, M.; Goldstein, G.; Cao, K.-F.
Filiación:Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun, Mengla, Yunnan 666303, China
Graduate University of Chinese Academy of Sciences, Beijing 100039, China
Department of Biology, University of Miami, PO Box 249118, Coral Gables, FL 33124, United States
Laboratorio de Ecología Funcional, Departamento de Ecología Genética y Evolución, Universidad de Buenos Aires, Ciudad Universitaria Pab. II 2 piso, C1428EHA Buenos Aires, Argentina
Palabras clave:cavitation; daily water balance; hydraulic conductivity; refilling; root pressure; carbon dioxide; water; bamboo; carbon dioxide; cavitation; functional group; gas exchange; hydraulic conductivity; nocturnal activity; root system; stomatal conductance; water use efficiency; woody plant; article; China; evapotranspiration; metabolism; photosynthesis; physiological stress; physiology; plant leaf; plant root; plant stem; plant stoma; Poaceae; pressure; tropic climate; wood; Carbon Dioxide; China; Photosynthesis; Plant Leaves; Plant Roots; Plant Stems; Plant Stomata; Plant Transpiration; Poaceae; Pressure; Stress, Physiological; Tropical Climate; Water; Wood; China; Phyllostachys acuta; Poaceae; Sinarundinaria
Año:2012
Volumen:32
Número:4
Página de inicio:414
Página de fin:422
DOI: http://dx.doi.org/10.1093/treephys/tps028
Título revista:Tree Physiology
Título revista abreviado:Tree Physiol.
ISSN:0829318X
CODEN:TRPHE
CAS:carbon dioxide, 124-38-9, 58561-67-4; water, 7732-18-5; Carbon Dioxide, 124-38-9; Water, 7732-18-5
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0829318X_v32_n4_p414_Yang

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Citas:

---------- APA ----------
Yang, S.-J., Zhang, Y.-J., Sun, M., Goldstein, G. & Cao, K.-F. (2012) . Recovery of diurnal depression of leaf hydraulic conductance in a subtropical woody bamboo species: Embolism refilling by nocturnal root pressure. Tree Physiology, 32(4), 414-422.
http://dx.doi.org/10.1093/treephys/tps028
---------- CHICAGO ----------
Yang, S.-J., Zhang, Y.-J., Sun, M., Goldstein, G., Cao, K.-F. "Recovery of diurnal depression of leaf hydraulic conductance in a subtropical woody bamboo species: Embolism refilling by nocturnal root pressure" . Tree Physiology 32, no. 4 (2012) : 414-422.
http://dx.doi.org/10.1093/treephys/tps028
---------- MLA ----------
Yang, S.-J., Zhang, Y.-J., Sun, M., Goldstein, G., Cao, K.-F. "Recovery of diurnal depression of leaf hydraulic conductance in a subtropical woody bamboo species: Embolism refilling by nocturnal root pressure" . Tree Physiology, vol. 32, no. 4, 2012, pp. 414-422.
http://dx.doi.org/10.1093/treephys/tps028
---------- VANCOUVER ----------
Yang, S.-J., Zhang, Y.-J., Sun, M., Goldstein, G., Cao, K.-F. Recovery of diurnal depression of leaf hydraulic conductance in a subtropical woody bamboo species: Embolism refilling by nocturnal root pressure. Tree Physiol. 2012;32(4):414-422.
http://dx.doi.org/10.1093/treephys/tps028