Photosynthesis and Leaf Structure in Domesticated Cassava (Euphorbiaceae) and a Close Wild Relative: Have Leaf Photosynthetic Parameters Evolved Under Domestication?

Biotropica - Tập 40 Số 3 - Trang 305-312 - 2008
Benoît Pujol1,2, Jean‐Louis Salager3, Michèle Beltran2, Sandie Bousquet4, Doyle McKey2
1Department of Plant Sciences, University of Oxford, South Parks Road, Oxford, OX1 3RB, UK,
2Department of Population Biology, CEFE UMR 5175/CNRS, 1919, route de Mende, 34293 Montpellier Cedex 5, France
3Department of Ecosystem Functioning, CEFE UMR 5175/CNRS, 1919, route de Mende, 34293 Montpellier Cedex 5, France
4Laboratory of Biogeochemistry and Ecology of Continental Environments, UMR 7618, Ecole Normale Supérieure, 46, rue d'Ulm, 75230 Paris Cedex 05, France

Tóm tắt

ABSTRACTBroad patterns across wild plant species show that leaf composition and morphology vary predictably among habitats, richer habitats favoring resource‐acquisition strategies and poorer habitats favoring resource‐conservation strategies. Domestication is often accompanied by a shift to richer habitats, and might thus be expected to lead to a shift in leaf composition and morphology and hence in photosynthetic parameters. We compared leaf photosynthetic parameters in domesticated cassava (Manihot esculenta) and a close wild relative, using greenhouse‐grown plants. In domesticated cassava, CO2 exchange rate expressed per unit mass and specific leaf area (SLA, m2/kg dry mass) were greater than in the wild relative, whereas leaf dry matter content (LDMC, dry mass/fresh mass) was lower in the domesticate. These results suggest that SLA and net photosynthetic rates may both have increased in the evolution of cassava under domestication, enabling more rapid growth in relatively resource‐rich and protected agricultural habitats. Previous comparisons of photosynthetic rates in domesticated plants and wild relatives have usually considered only leaf area‐based measures. Here, we discuss the interest of using mass‐based rates to study the evolution of ecological strategies under domestication.

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Biotropica

Tập 40 Số 3

305-312

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