Variations in the Leaf Anatomy among some C4 Panicum Species |
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Authors: | OHSUGI RYU; MURATA TAKAO |
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Institution: | Pasture Plants Division, National Grassland Research Institute 768 Senbonmatsu, Nishinasuno, Tochigi, 329-27, Japan |
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Abstract: | The Dichotomiflora group of Panicum contains NAD-malic enzyme(ME) species with centrifugal chloroplasts in Kranz cells, NAD-ME(F)species as well as NAD-ME species with centripetal chloroplastsin Kranz cells, NAD-ME (P) species. Many attributes of leafanatomy of 22 C4 Panicum species were investigated to identifydifferences among four different C4 subtypes, i.e. NADP-ME,NAD-ME(F), NAD-ME(P) and PEP-CK species grouped by the C4-aciddecarboxylating enzymes and chloroplast location in Kranz cellsin combination. Differences were found in the number of Kranzcells surrounding a large vein, and the number surrounding asmall vein, the interveinal distances, the proportion of leafcross sectional area occupied by epidermis plus sclerenchyma,by mesophyll cells, by Kranz cells, and by vascular bundles.There were also differences in the ratios of the area of thedifferent cell types. The number of the characters significantlydifferent between a respective pair of C4 subtypes was the largestbetween NAD-ME(F) and NAD-ME(P) species. In principal componentanalysis applied to 11 leaf anatomical characters, the differentC4 subtypes clustered into small groups, although the rangeof variations of PEP-CK species and those of NAD-ME(F) speciesoverlapped. The results were discussed in relation to taxonomyand ecological adaptation of Panicum species in the differentC4 subtypes. C4 photosynthesis, NADP-malic enzyme, NAD-malic enzyme, Phosphoenolpyruvate carboxykinase, C4 leaf anatomy, Panicum, Kranz, Dichotomiflora group |
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