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

Oecologia
Rebecca A Montgomery, Thomas J Givnish

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-...Continue Reading

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Citations

Aug 14, 2012·Tree Physiology·Danielle A Way, Robert W Pearcy
Jun 2, 2017·Plant Signaling & Behavior·Thomas E Marler
Mar 2, 2018·International Journal of Molecular Sciences·Hoang Chinh NguyenKai-Chieh Chang
Jan 31, 2014·Proceedings. Biological Sciences·Thomas J Givnish, Rebecca A Montgomery
Nov 14, 2018·Nature Ecology & Evolution·Kun HuangYiqi Luo
Sep 1, 2008·Functional Plant Biology : FPB·Rebecca A MontgomeryThomas J Givnish

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