Journal
PLANT SCIENCE
Volume 168, Issue 3, Pages 731-739Publisher
ELSEVIER IRELAND LTD
DOI: 10.1016/j.plantsci.2004.10.005
Keywords
Stipagrostis pennata; C-4 plants; C-4 photosynthesis; Kranz anatomy
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The genus Stipagrostis in family Poaceae is composed of species, which have Kranz anatomy and C-4 photosynthesis. There are three classical biochemical subtypes of C-4 plants in the family based on the type Of C4 acid decarboxylase [NADP-malic enzyme (NADP-ME), NAD-malic enzyme (NAD-ME), and phosphoenolpyruvate carboxykinase (PEP-CK)], features of leaf anatomy, and of chloroplasts and mitochondria structure and/or position in the distinctive Kranz sheath cells. Initially, from some information on biochemistry and chloroplast ultrastructure, Stipagrostis species were suggested to be NADP-ME type. Yet, they have been classified as classical NAD-ME type C-4 species based on the occurrence of a double parenchyma sheath around the veins with an outer Kranz sheath that has chloroplasts in a centripetal position. We show through analysis of photosynthetic enzymes and their immunolocalization, and microscopy of leaf structure in the species Stipagrostis pennata, that members of this genus are a novel nonclassical NADP-ME type, which we will call Stipagrostoid. (C) 2004 Elsevier Ireland Ltd. All rights reserved.
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