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Publication Type J
Authors Alvarez, R., J. M. Castillo, E. Mateos-Naranjo, J. Gandullo, A. E. Rubio-Casal, F. J. Moreno and M. E. Figueroa
Title Ecotypic variations in phosphoenolpyruvate carboxylase activity of the cordgrass Spartina densiflora throughout its latitudinal distribution range
Source Plant Biology
Author Keywords Alien invasion Lagoa dos Patos Mar de Chiquita Odiel Marshes Patagonia phosphorylation salt marsh san-francisco bay salt-marsh leaf anatomy c-4 photosynthesis iberian peninsula plants light phosphorylation populations poaceae
Abstract This study compared the specific activity of phosphoenolpyruvate carboxylase (PEPC) of Spartina densiflora Brongn., collected from four populations along its latitudinal distribution range. Spartina densiflora is a halophyte with C(4) photosynthesis that has a very wide latitudinal distribution, from Patagonia to the southwest Iberian Peninsula. The basis of intraspecific differences in PEPC activity were analysed by recording the phosphorylation state and amount of the enzyme, comparing leaf anatomy and evaluating leaf gas exchange. S. densiflora individuals from Patagonia had 60% higher PEPC specific activity than plants from the other three populations due to higher levels of PEPC protein that coincided with lower activation mediated by phosphorylation, yielding similar net photosynthesis rate (c. 29 mu mol CO(2)center dot m-2 center dot s-1). Patagonian plants had a higher area of photosynthetic mesophyll relative to total chlorophyll than plants from north Argentina and the southwest Iberian Peninsula. Ecotypic differentiation in PEPC activity and leaf anatomy were found, distinguishing a higher-latitude ecotype from lower-latitude populations. The higher PEPC protein levels of the Patagonian ecotype seemed to be a response to lower light activation level of the enzyme, as judged by the low PEPC phosphorylation state.
Author Address [Alvarez, R; Castillo, JM; Mateos-Naranjo, E; Gandullo, J; Rubio-Casal, AE; Figueroa, ME] Univ Seville, Dept Biol Vegetal & Ecol, Seville, Spain [Moreno, FJ] Univ Seville, Dept Biol Celular, Seville, Spain Castillo, JM (reprint author), Univ Seville, Dept Biol Vegetal & Ecol, Seville, Spain manucas@us.es
ISSN 1435-8603
ISBN 1435-8603
29-Character Source Abbreviation Plant Biol.
Publication Date Jan
Year Published 2010
Volume 12
Issue 1
Beginning Page 154-160
Digital Object Identifier (DOI) 10.1111/j.1438-8677.2009.00198.x
Unique Article Identifier WOS:000272589700016
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