Leaf anatomy, gas exchange and photosynthetic enzyme activity in Flaveria kochiana

Functional Plant Biology : FPB
Erika A SudderthRowan F Sage

Abstract

Flaveria (Asteraceae) is one of the few genera known to contain both C3 and C4 species, in addition to numerous biochemically-intermediate species. C3-C4 and C4-like intermediate photosynthesis have arisen more than once in different phylogenetic clades of Flaveria. Here, we characterise for the first time the photosynthetic pathway of the recently described species Flaveria kochiana B.L. Turner. We examined leaf anatomy, activity and localisation of key photosynthetic enzymes, and gas exchange characteristics and compared these trait values with those from related C4 and C4-like Flaveria species. F. kochiana has Kranz anatomy that is typical of other C4 Flaveria species. As in the other C4 lineages within the Flaveria genus, the primary decarboxylating enzyme is NADP-malic enzyme. Immunolocalisation of the major C4 cycle enzymes, PEP carboxylase and pyruvate, orthophosphate dikinase, were restricted to the mesophyll, while Rubisco was largely localised to the bundle sheath. Gas exchange analysis demonstrated that F. kochiana operates a fully functional C4 pathway with little sensitivity to ambient oxygen levels. The CO2 compensation point (2.2 µbar) was typical for C4 species, and the O2-response of the CO2 compensation point ...Continue Reading

References

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Citations

Feb 8, 2013·Annals of Botany·Riyadh Muhaidat, Athena D McKown
Mar 29, 2014·Journal of Experimental Botany·Jason C OakleyRowan F Sage
Sep 30, 2014·The New Phytologist·Pascal-Antoine Christin, Colin P Osborne
Jan 30, 2008·Journal of Experimental Botany·David S KubienLinley K Jesson
Jul 23, 2008·Plant, Cell & Environment·Ferit KocacinarRowan F Sage
Sep 5, 2012·Journal of Experimental Botany·Roxana KhoshraveshRowan F Sage

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