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

Feild, Taylor S., Chatelet, David S., Balun, Lawong, Schilling, Edward E., and Evans, Robert (2012) The evolution of angiosperm lianescence without vessels: climbing mode and wood structure–function in Tasmannia cordata (Winteraceae). New Phytologist, 193 (1). pp. 229-240.

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Abstract

• 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.

• Wood 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.

• The 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.

• Tasmannia 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.

Item ID: 35652
Item Type: Article (Research - C1)
ISSN: 1469-8137
Keywords: adaptive radiation, angiosperm evolution, liana evolution, montane uplift, stem biomechanics, xylem vessels
Funders: National Science Foundation (USA)
Projects and Grants: NSF (IOB-0714156)
Date Deposited: 01 Oct 2014 15:56
FoR Codes: 06 BIOLOGICAL SCIENCES > 0607 Plant Biology > 060705 Plant Physiology @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970106 Expanding Knowledge in the Biological Sciences @ 100%
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