NDLI: Adaptive radiation of photosynthetic physiology in the Hawaiian lobeliads: dynamic photosynthetic responses

Content Provider	Springer Nature Link
Author	Montgomery, Rebecca A. Givnish, Thomas J.
Copyright Year	2008
Abstract	Hawaiian lobeliads have radiated into habitats from open alpine bogs to densely shaded rainforest interiors, and show corresponding adaptations in steady-state photosynthetic light responses and associated leaf traits. Shaded environments are not uniformly dark, however, but punctuated by sunflecks that carry most of the photosynthetically active light that strikes plants. We asked whether lobeliads have diversified in their dynamic photosynthetic light responses and how dynamic responses influence daily leaf carbon gain. We quantified gas exchange and dynamic light regimes under field conditions for ten species representing each major Hawaiian sublineage. Species in shadier habitats experienced shorter and less numerous sunflecks: average sunfleck length varied from 1.4 ± 1.7 min for Cyanea floribunda in shaded forest understories to 31.2 ± 2.1 min for Trematolobelia kauaiensis on open ridges. As expected, the rate of photosynthetic induction increased significantly toward shadier sites, with assimilation after 60 s rising from ca. 30% of fully induced rates in species from open environments to 60% in those from densely shaded habitats. Uninduced light use efficiency—actual photosynthesis versus that expected under steady-state conditions—increased from 10 to 70% across the same gradient. In silico transplants—modeling daily carbon gain using one species’ photosynthetic light response in its own and other species’ dynamic light regimes—demonstrated the potential adaptive nature of species differences: understory Cyanea pilosa in its light regimes outperformed gap-dwelling Clermontia parviflora, while Clermontia in its light regimes outperformed Cyanea. The apparent crossover in daily photosynthesis occurred at about the same photon flux density where dominance shifts from Cyanea to Clermontia in the field. Our results further support our hypothesis that the lobeliads have diversified physiologically across light environments in Hawaiian ecosystems and that those shifts appear to maximize the carbon gain of each species in its own environment.
Starting Page	455
Ending Page	467
Page Count	13
File Format	PDF
ISSN	00298549
Journal	Oecologia
Volume Number	155
Issue Number	3
e-ISSN	14321939
Language	English
Publisher	Springer-Verlag
Publisher Date	2008-01-22
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Sunflecks Dynamic response of photosynthesis Light heterogeneity Induction Light use efficiency Plant Sciences Ecology
Content Type	Text
Resource Type	Article
Subject	Ecology, Evolution, Behavior and Systematics

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Adaptive radiation of photosynthetic physiology in the Hawaiian lobeliads: light regimes, static light responses, and whole-plant compensation points1

DOI 10.1007/s00442-007-0936-3PHYSIOLOGICAL ECOLOGY- ORIGINAL PAPER Adaptive radiation of photosynthetic physiology in the Hawaiian lobeliads: dynamic photosynthetic responses

Adaptive radiation of photosynthetic physiology in the Hawaiian lobeliads: light regimes, static light responses, and whole-plant compensation points.

Physiology of the seasonal relationship between the photochemical reflectance index and photosynthetic light use efficiency

Modeling dynamic understory photosynthesis of contrasting species in ambient and elevated carbon dioxide

Highly predictable photosynthetic production in natural macroalgal communities from incoming and absorbed light

Enhanced isoprene-related tolerance of heat- and light-stressed photosynthesis at low, but not high, CO2 concentrations

Physiological responses to nitrogen and sulphur addition and raised temperature in Sphagnum balticum

Common-garden studies on adaptive radiation of photosynthetic physiology among Hawaiian lobeliads

Adaptive radiation of photosynthetic physiology in the Hawaiian lobeliads: dynamic photosynthetic responses

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Adaptive radiation of photosynthetic physiology in the Hawaiian lobeliads: light regimes, static light responses, and whole-plant compensation points1

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