ARTICLE TITLE:

REFERENCE TYPE:

AUTHOR(S):

EDITOR(S):

PUBLICATION DATE:

PUBLICATION TITLE:

VOLUME:

PAGES:

ABSTRACT:

The evolution of angiosperm lianescence without vessels–climbing mode and wood structure–function in Tasmannia cordata (Winteraceae)

Journal Article

Feild TS; Chalelet DS; Balun L; Shilling EE; Evans R

2012

New Phytologist

193

229-240

The lack of extant lianescent vessel-less seed plants supports a hypothesis that liana evolution requires large-diameter xylem conduits. Here we demonstrate an unusual example of a lianoid vessel-less angiosperm Tasmannia cordata (Winteraceae) from New Guinea.\n\nWood mechanical hydraulic and structural measurements were used to determine how T. cordata climbs and to test for ecophysiological shifts related to liana evolution vs 13 free-standing congeners.\n\nThe tracheid-based wood of T. cordata furnished low hydraulic capacity compared with that of vessel-bearing lianas. In comparison with most nonclimbing relatives T. cordata possessed lower photosynthetic rates and leaf and stem hydraulic capacities. However T. cordata exhibited a two- to five-fold greater wood elastic modulus than its relatives.\n\nTasmannia cordata provides an unusual example of angiosperm liana evolution uncoupled from xylem conduit gigantism as well as high plasticity and cell type diversity in vascular development. Because T. cordata lacks vessels our results suggest that a key limitation for a vessel-less liana is that strong and low hydraulically conductive wood is required to meet the mechanical demands of lianescence.

URL:

Support

The Liana Ecology Project is supported by Marquette University and funded in part by the National Science Foundation.