Dryad logo

Data from: The evolution of photosynthetic anatomy in Viburnum (Adoxaceae)

Citation

Chatelet, David S. et al. (2014), Data from: The evolution of photosynthetic anatomy in Viburnum (Adoxaceae), Dryad, Dataset, https://doi.org/10.5061/dryad.457f7

Abstract

Premise of research: Leaf mesophyll is often differentiated into a palisade layer with tightly packed, elongated cells (I-cells) and a spongy layer with loosely packed, complex shaped cells. An alternative palisade type, composed of branched H-cells, has evolved in a number of plant lineages. Viburnum (Adoxaceae) possesses both types of palisade, providing an opportunity to assess the significance of evolutionary switches between these forms. Methodology: An anatomical survey of 80 species spanning the Viburnum phylogeny permitted an analysis of palisade differences in relation to other characters. A geometric model of leaf mesophyll surface area for CO2 absorption correlated well with measured photosynthetic capacity in a subset of species, allowing us to infer shifts in photosynthetic function. Pivotal results: Ancestrally, viburnums probably produced a palisade with one layer of H-cells. Multiple transitions to two layers of H-cells (H2) and to one or two layers of I-cells (I1, I2) occurred. These shifts were correlated with increases in photosynthetic capacity, and H2 appear functionally equivalent to I1 with respect to CO2 absorption. Conclusions: Photosynthetic anatomy H2 and I1 palisade may represent alternative evolutionary solutions for increasing leaf CO2 absorption. Additionally, H-cells and I-cells might perform differently with respect to light absorption and/or drought tolerance. The evolution of I-palisade cells may thus have tracked movements into open environments, while H2 could increase photosynthetic capacity in the forest understory.

Usage Notes

References

Location

Vietnam
Panama
Japan
Taiwan
Mexico
Malaysia
North America
Costa Rica