Journal ArticleDOI
The effect of nitrogen supply on growth and water-use efficiency of xylem-tapping mistletoes.
TLDR
Growth rates and the accumulation of N, P, K, and Ca as well as values for carbon-isotope ratios of Mistletoe tissues support the hypothesis that the higher transpiration rates of mistletoes represent a nitrogen-gathering mechanism.Abstract:
Xylem-tapping mistletoes are known to have normally a higher rate of transpiration and lower water-use efficiency than their hosts. The relationships between water relations, nutrients and growth were investigated for Phoradendron juniperinum growing on Juniperus osteosperma (a non-nitrogen-fixing tree) and for Phoradendron californicum growing on Acacia greggii (a nitrogen-fixing tree). Xylem sap nitrogen contents were approximately 3.5 times higher in the nitrogen-fixing host than in the non-nitrogen-fixing host. The results of the present study show that mistletoe growth rates were sevenfold greater on a nitrogen-fixing host. At the same time, however, the differences in water-use efficiency between mistletoes and their hosts, which were observed on the non-nitrogen-fixing host did not exist when mistletoes were grown on hosts with higher nitrogen contents in their xylem sap. Growth rates and the accumulation of N, P, K, and Ca as well as values for carbon-isotope ratios of mistletoe tissues support the hypothesis that the higher transpiration rates of mistletoes represent a nitrogen-gathering mechanism.read more
Citations
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Journal ArticleDOI
Stable Isotopes in Plant Ecology
TL;DR: How isotope measurements associated with the critical plant resources carbon, water, and nitrogen have helped deepen the understanding of plant-resource acquisition, plant interactions with other organisms, and the role of plants in ecosystem studies is reviewed.
Journal ArticleDOI
The Ecology and Economics of Storage in Plants
TL;DR: Criteria for defining storage in ecological and eonomic contexts is suggested in order to examine the costs and benefits of storage and the evidence for different types of storage is evaluated.
Journal ArticleDOI
Impacts of parasitic plants on natural communities.
TL;DR: Parasitic plants can alter the physical environment around them--including soil water and nutrients, atmospheric CO2 and temperature--and so may also be considered as ecosystem engineers, which can have further consequences in altering the resource supply to and behaviour of other organisms within parasitic plant communities.
Journal ArticleDOI
Carbon reserves and canopy defoliation determine the recovery of Scots pine 4 yr after a drought episode
TL;DR: Structural equation modeling was used to analyse the recovery of Scots pine trees 4 yr after an extreme drought episode occurred in 2004-2005 in north-east Spain and indicated that current depletion of carbon reserves was a result of reduced photosynthetic tissue.
Journal ArticleDOI
The physiology and biochemistry of parasitic angiosperms
TL;DR: The parasite population in the United States has increased by more than 40% in the past decade, according to a report published in the Journal of Parasite Research and Ecology.
References
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Journal ArticleDOI
On the Relationship Between Carbon Isotope Discrimination and the Intercellular Carbon Dioxide Concentration in Leaves
TL;DR: It is shown how diffusion of gaseous COz can significantly affect carbon isotopic discrimination and a simple relationship between discrimination and the ratio of the intercellular and atmospheric partial pressures of COZ is developed.
Book ChapterDOI
Stomatal Responses, Water Loss and CO2 Assimilation Rates of Plants in Contrasting Environments
Ernst Detlef Schulze,A. E. Hall +1 more
TL;DR: The stomatal aperture appears to be controlled by complex mechanisms which operate to maintain a variable balance between allowing CO2 uptake to proceed, while restricting the loss of water vapor, and preventing leaf desiccation as mentioned in this paper.
Book ChapterDOI
Plant Life Forms and Their Carbon, Water and Nutrient Relations
TL;DR: The vegetation of the earth is characterized by distinct zones which have a rather uniform physiognomical appearance or structure even though they may be composed of many different plant species, genera, and families and may have a very different evolutionary history as discussed by the authors.