Microenvironment in the canopy rivals the host tree water status in controlling sap flow of a mistletoe species
Mistletoes absorb water from the vascular system of their hosts and thus the water use of mistletoes can be influenced by the water status of their hosts besides abiotic environmental conditions; however, there is a lack of studies on the dynamics of mistletoe water utilization in relation to both t...
Guardado en:
| Autor principal: | |
|---|---|
| Publicado: |
2017
|
| Materias: | |
| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0829318X_v37_n4_p501_Yang http://hdl.handle.net/20.500.12110/paper_0829318X_v37_n4_p501_Yang |
| Aporte de: |
| id |
paper:paper_0829318X_v37_n4_p501_Yang |
|---|---|
| record_format |
dspace |
| spelling |
paper:paper_0829318X_v37_n4_p501_Yang2023-06-08T15:46:11Z Microenvironment in the canopy rivals the host tree water status in controlling sap flow of a mistletoe species Goldstein, Guillermo Hernan Hemi-parasitic plant plant water relations transpiration vascular parasitic plant water use. water evapotranspiration microclimate parasitology photosynthesis physiology tree Viscum xylem Microclimate Photosynthesis Plant Transpiration Trees Viscum Water Xylem Mistletoes absorb water from the vascular system of their hosts and thus the water use of mistletoes can be influenced by the water status of their hosts besides abiotic environmental conditions; however, there is a lack of studies on the dynamics of mistletoe water utilization in relation to both types of controlling factors. By building a canopy platform at 20 m above the ground, we monitored the dynamic changes of sap flow of Viscum coloratum (Kom.) Nakai (Loranthaceae) in combination with continuous measurements of microclimatic variables and volumetric water content (VWC) of its host tree branch xylem. We found that the host tree VWC exhibited substantial fluctuations during sunny days but lower VWC of the host did not negatively affect the sap flow of V. coloratum. Hourly and daily mean transpiration rates (Esap) of V. coloratum calculated from sap flow measurements showed strong positive correlations with photosynthetic photon flux density (PPFD) and vapor pressure deficit (VPD) measured in close vicinity to the point of mistletoe attachment. The mean Esap of V. coloratum was substantially higher than that of their host during clear days (4.55 ± 0.54 vs 2.01 ± 0.15 kg m-2 day-1). Moreover, the mistletoe-to-host transpiration ratio was not constant but became increasingly larger with the increase of PPFD or VPD on both hourly and daily bases, suggesting a weaker control of water loss in the mistletoe in comparison to its host species. The strong dependence of mistletoe Esap on micrometeorological variables and its decoupling from the host tree xylem water status suggests that the development of dense tree canopy functions as a potential mechanism for the host trees in reducing the competitive water use of mistletoes. These findings have important implications for the interactions between mistletoe species and their host trees in temperate forests. © 2016 The Author. Fil:Goldstein, G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2017 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0829318X_v37_n4_p501_Yang http://hdl.handle.net/20.500.12110/paper_0829318X_v37_n4_p501_Yang |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Hemi-parasitic plant plant water relations transpiration vascular parasitic plant water use. water evapotranspiration microclimate parasitology photosynthesis physiology tree Viscum xylem Microclimate Photosynthesis Plant Transpiration Trees Viscum Water Xylem |
| spellingShingle |
Hemi-parasitic plant plant water relations transpiration vascular parasitic plant water use. water evapotranspiration microclimate parasitology photosynthesis physiology tree Viscum xylem Microclimate Photosynthesis Plant Transpiration Trees Viscum Water Xylem Goldstein, Guillermo Hernan Microenvironment in the canopy rivals the host tree water status in controlling sap flow of a mistletoe species |
| topic_facet |
Hemi-parasitic plant plant water relations transpiration vascular parasitic plant water use. water evapotranspiration microclimate parasitology photosynthesis physiology tree Viscum xylem Microclimate Photosynthesis Plant Transpiration Trees Viscum Water Xylem |
| description |
Mistletoes absorb water from the vascular system of their hosts and thus the water use of mistletoes can be influenced by the water status of their hosts besides abiotic environmental conditions; however, there is a lack of studies on the dynamics of mistletoe water utilization in relation to both types of controlling factors. By building a canopy platform at 20 m above the ground, we monitored the dynamic changes of sap flow of Viscum coloratum (Kom.) Nakai (Loranthaceae) in combination with continuous measurements of microclimatic variables and volumetric water content (VWC) of its host tree branch xylem. We found that the host tree VWC exhibited substantial fluctuations during sunny days but lower VWC of the host did not negatively affect the sap flow of V. coloratum. Hourly and daily mean transpiration rates (Esap) of V. coloratum calculated from sap flow measurements showed strong positive correlations with photosynthetic photon flux density (PPFD) and vapor pressure deficit (VPD) measured in close vicinity to the point of mistletoe attachment. The mean Esap of V. coloratum was substantially higher than that of their host during clear days (4.55 ± 0.54 vs 2.01 ± 0.15 kg m-2 day-1). Moreover, the mistletoe-to-host transpiration ratio was not constant but became increasingly larger with the increase of PPFD or VPD on both hourly and daily bases, suggesting a weaker control of water loss in the mistletoe in comparison to its host species. The strong dependence of mistletoe Esap on micrometeorological variables and its decoupling from the host tree xylem water status suggests that the development of dense tree canopy functions as a potential mechanism for the host trees in reducing the competitive water use of mistletoes. These findings have important implications for the interactions between mistletoe species and their host trees in temperate forests. © 2016 The Author. |
| author |
Goldstein, Guillermo Hernan |
| author_facet |
Goldstein, Guillermo Hernan |
| author_sort |
Goldstein, Guillermo Hernan |
| title |
Microenvironment in the canopy rivals the host tree water status in controlling sap flow of a mistletoe species |
| title_short |
Microenvironment in the canopy rivals the host tree water status in controlling sap flow of a mistletoe species |
| title_full |
Microenvironment in the canopy rivals the host tree water status in controlling sap flow of a mistletoe species |
| title_fullStr |
Microenvironment in the canopy rivals the host tree water status in controlling sap flow of a mistletoe species |
| title_full_unstemmed |
Microenvironment in the canopy rivals the host tree water status in controlling sap flow of a mistletoe species |
| title_sort |
microenvironment in the canopy rivals the host tree water status in controlling sap flow of a mistletoe species |
| publishDate |
2017 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0829318X_v37_n4_p501_Yang http://hdl.handle.net/20.500.12110/paper_0829318X_v37_n4_p501_Yang |
| work_keys_str_mv |
AT goldsteinguillermohernan microenvironmentinthecanopyrivalsthehosttreewaterstatusincontrollingsapflowofamistletoespecies |
| _version_ |
1768546214728433664 |