Ion fluxes across the pitcher walls of three Bornean Nepenthes pitcher plant species : flux rates and gland distribution patterns reflect nitrogen sequestration strategies
Show FileMIME type:application/pdfFile Size:324.4 Kb
Moran, Jonathan A.
Hawkins, Barbara J.
Gowen, Brent E.
Robbins, Samantha L.
MetadataShow full item record
SubjectDigestive Glands; H+; Ion Flux; MIFE; Nepenthes; NH+4; phytotelm; pitcher plant; scanning electron microscopy
Nepenthes pitcher plant species differ in their prey capture strategies, prey capture rates, and pitcher longevity. In this study, it is investigated whether or not interspecific differences in nutrient sequestration strategy are reflected in the physiology and microstructure of the pitchers themselves. Using a non-invasive technique (MIFE), ion fluxes in pitchers of Nepenthes ampullaria Jack, Nepenthes bicalcarata Hook.f., and Nepenthes rafflesiana Jack were measured. Scanning electron microscopy was also used to characterize the distribution of glandular and other structures on the inner pitcher walls. The results demonstrate that nutrient sequestration strategy is indeed mirrored in pitcher physiology and microstructure. Species producing long-lived pitchers with low prey capture rates (N. ampullaria, N. bicalcarata) showed lower rates of NH4 + uptake than N. rafflesiana, a species producing short-lived pitchers with high capture rates. Crucially, species dependent upon aquatic commensals (N. ampullaria, N. bicalcarata) actively manipulated H+ fluxes to maintain less acid pitcher fluid than found in ‘typical’ species; in addition, these species lacked the lunate cells and epicuticular waxes characteristic of ‘typical’ insectivorous congeners. An unexpected finding was that ion fluxes occurred in the wax-covered, non-glandular zones in N. rafflesiana. The only candidates for active transport of aqueous ions in these zones appear to be the epidermal cells lying beneath the lunate cells, as these are the only sites not visibly coated with epicuticular waxes.
Showing items related by title, author, creator and subject.
Foliar reflectance and vector analysis reveal nutrient stress in prey-deprived pitcher plants ( nepenthes rafflesiana ) Moran, Jonathan A.; Moran, Alison J. (International Journal of Plant Sciences, 1998-11)Pitcher plants of the genus Nepenthes trap invertebrate prey in pitchers formed from modified leaf tips. This study investigates the benefits of carnivory to Nepenthes rafflesiana, a common Bornean lowland species. Plants ...
From carnivore to detritivore? Isotopic evidence for leaf litter utilization by the tropical pitcher plant Nepenthes ampullaria Moran, Jonathan A.; Clarke, Charles M.; Hawkins, Barbara J. (International Journal of Plant Sciences, 2003-07)Nepenthes pitcher plants trap prey in specialized leaves formed into pitchers. Most lowland species live in open, sunny habitats and capture prey to obtain nutrients, principally nitrogen (N). Nepenthes ampullaria is ...
Potential effects of climate change on members of the Palaeotropical pitcher plant family Nepenthaceae Moran, Jonathan A.; Gray, Laura K.; Clarke, Charles; Wint, G. R. William (PLoS ONE, 2017-08-17)Anthropogenic climate change is predicted to have profound effects on species distributions over the coming decades. In this paper, we used maximum entropy modelling (Maxent) to estimate the effects of projected changes ...