Differential response of stomata to air humidity in the parasitic mistletoe (Phthirusa pyrifolia) and its host, mandarin orange (Citrus resitulata)

El‐Sharkawy, Mabrouk A.; Cock, James H.; Hernández, Anna Del Pilar

doi:10.1007/bf00029798

Cited by 11 publications

(6 citation statements)

References 22 publications

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“…Our result is not surprising since mistletoes evolved under different selective pressures than the species studied by Rossatto et al (2009) and because the water unit-cost is probably much lower for parasitic plants (Scalon and Wright 2015). We suggest that higher stomatal density and larger stomata sizes might be a trend among other mistletoe species, as previously reported for another species of the same genus, Passovia pyrifolia (El-Sharkawy et al 1986) and for different species of mistletoes from the Viscaceae family, such as Phoradendron villosum (Hollinger 1983) and Viscum album (Escher et al 2008).…”

Section: Stomatal Behaviour and Morphologysupporting

confidence: 82%

Leaf morphophysiology of a Neotropical mistletoe is shaped by seasonal patterns of host leaf phenology

et al. 2015

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Several mistletoe species are able to grow and reproduce on both deciduous and evergreen hosts, suggesting a degree of plasticity in their ability to cope with differences in intrinsic host functions. The aim of this study was to investigate the influence of host phenology on mistletoe water relations and leaf gas exchange. Mistletoe Passovia ovata parasitizing evergreen (Miconia albicans) hosts and P. ovata parasitizing deciduous (Byrsonima verbascifolia) hosts were sampled in a Neotropical savanna. Photosynthetic parameters, diurnal cycles of stomatal conductance, pre-dawn and midday leaf water potential, and stomatal anatomical traits were measured during the peak of the dry and wet seasons, respectively. P. ovata showed distinct water-use strategies that were dependent on host phenology. For P. ovata parasitizing the deciduous host, water use efficiency (WUE; ratio of photosynthetic rate to transpirational water loss) was 2-fold lower in the dry season than in the wet season; in contrast, WUE was maintained at the same level during the wet and dry seasons in P. ovata parasitizing the evergreen host. Generally, mistletoe and host diurnal cycles of stomatal conductance were linked, although there were clear differences in leaf water potential, with mistletoe showing anisohydric behaviour and the host showing isohydric behaviour. Compared to mistletoes attached to evergreen hosts, those parasitizing deciduous hosts had a 1.4-fold lower stomatal density and 1.2-fold wider stomata on both leaf surfaces, suggesting that the latter suffered less intense drought stress. This is the first study to show morphophysiological differences in the same mistletoe species parasitizing hosts of different phenological groups. Our results provide evidence that phenotypical plasticity (anatomical and physiological) might be essential to favour the use of a greater range of hosts.

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Section: Stomatal Behaviour and Morphologysupporting

confidence: 82%

Leaf morphophysiology of a Neotropical mistletoe is shaped by seasonal patterns of host leaf phenology

et al. 2015

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“…; El Sharkawy et al . ; Panvini & Eickmeier ). However, in this study we found no differences between hosts and mistletoes in N leaf concentration, and a number of other studies have reported leaf N concentrations of parasitic plants that were similar or even lower than their respective host (Lamont & Southall ; Küppers et al .…”

Section: Discussionmentioning

confidence: 99%

“…It is usually accepted that mistletoes have higher leaf N concentrations than the host plants (Glatzel 1983;Lamont 1983;Ehleringer et al 1985;El Sharkawy et al 1986;Panvini & Eickmeier 1993). However, in this study we found no differences between hosts and mistletoes in N leaf concentration, and a number of other studies have reported leaf N concentrations of parasitic plants that were similar or even lower than their respective host (Lamont & Southall 1982;K€ uppers et al 1992;Bannister et al 2002;Bowie & Ward 2004;Burns et al 2011). Higher leaf N concentrations than the host might make mistletoe leaves more attractive to herbivores (Marvier 1995;Kyto et al 1996) and lead to a decrease in their fitness.…”

Section: Discussionmentioning

confidence: 99%

A comparative study of aluminium and nutrient concentrations in mistletoes on aluminium‐accumulating and non‐accumulating hosts

2013

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Mistletoes offer a unique model to study interactions among Al and nutrients in vascular plants, because they grow and reproduce on hosts with distinct Al uptake strategies. We investigated Al distribution and nutrient relations of mistletoes on Al-accumulating and non-accumulating hosts. We hypothesised that mistletoes would exhibit similar leaf nutrient and Al concentrations as their host plants, but a strong compartmentalisation of Al when growing on Al-accumulators. We measured concentrations of N, P, K, Ca, Mg, Cu, Fe, Mn, Zn in leaves and Al in leaves, seeds and branches of Phthirusa ovata and Psittacanthus robustus infecting Miconia albicans, an Al-accumulator, and Ph. ovata infecting Byrsonima verbascifolia, a non-Al-accumulator. High leaf concentrations of Al in Ph. ovata only occurred while parasitizing the Al-accumulating host; there was no accumulation in branches or seeds. In P. robustus, large concentrations of Al were found in leaves, branches and seeds. Mistletoe seed viability and leaf nutrient concentrations were not affected by Al accumulation. Passive uptake of Al, Ca, Mg, Mn and Cu in mistletoes was evidenced by significant correlations between mistletoes and host leaf concentrations, but not of N, P and K. Al was retranslocated to different plant organs in P. robustus, whereas it was mostly restricted to leaves in Ph. ovata. We suggest that Al might have some specific function in P. robustus, which only parasitizes Al-accumulator hosts, while the host generalist Ph. ovata can be considered a facultative Al-accumulator.

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“…One of the common physiological features of mistletoes is that they have higher transpiration rates than those of their hosts (Schuize, Turner & Glatzel, 1984;Ullmann et al, 1985;Ehleringer et al, 1985;El-Sharkawy, Cock & Hernandez, 1986;. In a study conducted in the system Phoradendrum juniper inumum I Juniperum oisteoperma, Ehleringer, Cook & Tieszen (1986) found that, because of higher rates of water loss induced by mistletoe parasitism, infested juniper trees experienced lower leaf water potentials than uninfested trees.…”

Section: Introductionmentioning

confidence: 99%

How does a mistletoe affect the water, nitrogen and carbon balance of two mangrove ecosystem species?

Orozco¹,

Rada²,

Azócar³

et al. 1990

Plant Cell & Environment

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The effect of a mistletoe, Phthirusa maritima, on the water, nitrogen and carbon balance of two mangrove host species, Conocarpus erectus and Coccoloba uvifera, was studied. Several daily cycles of water potential and its components (pressure-volume curves); leaf nitrogen content (Kjeldahl method); leaf conductance, transpiration rates and carbon assimilation (portable gas exchange system) were measured on mistletoe, infested and uninfested plants in the Caribbean coast of Venezuela. The mistletoe on both host species showed higher transpiration rates and lower CO2 assimilation rates, and therefore lower water use efficiencies. With respect to infested and uninfested plants, C. erectus did not show large differences in the parameters measured with the exception of assimilation rates which were significantly lower in the infested plants. On the other hand, C. uvifera did show differences in all parameters and, therefore, was affected to a greater degree by the mistletoe. The behaviour of mistletoeinfested and uninfested plants, with respect to habitats with different degrees of water stress and with respect to the salinity gradient in which these mangroves grow, is discussed.

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Differential response of stomata to air humidity in the parasitic mistletoe (Phthirusa pyrifolia) and its host, mandarin orange (Citrus resitulata)

Cited by 11 publications

References 22 publications

Leaf morphophysiology of a Neotropical mistletoe is shaped by seasonal patterns of host leaf phenology

Leaf morphophysiology of a Neotropical mistletoe is shaped by seasonal patterns of host leaf phenology

A comparative study of aluminium and nutrient concentrations in mistletoes on aluminium‐accumulating and non‐accumulating hosts

How does a mistletoe affect the water, nitrogen and carbon balance of two mangrove ecosystem species?

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