Original Research

The Kranz syndrome in the Eragrostideae (Chloridoideae, Poaceae) as indicated by carbon isotopic ratios*

Hector O. Panarello, Evangelina Sanchez
Bothalia | Vol 15, No 3/4 | a1852 | DOI: https://doi.org/10.4102/abc.v15i3/4.1852 | © 1984 Hector O. Panarello, Evangelina Sanchez | This work is licensed under CC Attribution 4.0
Submitted: 06 December 1984 | Published: 06 December 1984

About the author(s)

Hector O. Panarello, Instituto de Geocronologia y Geología Istotópica, Ciudad Universitaria, Argentina
Evangelina Sanchez, Museo Argentino de Ciencias Naturales. ‘Bernardino Rivadavia, Argentina

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13C/12C ratios are generally regarded as being very reliable indicators of C3 or C4 photosynthesis. These relative carbon isotope ratios are expressed as a negative δ 3C and fall into two distinct groups: Kranz (or C4) plants with δ between -9°/00 no and -18°/00 and non-Kranz (C3) plants with δ between -22°/00 and -280/00 no. In this paper, 29 taxa, representing 12 genera, of the tribe Eragrostideae were examined by mass spectrometry for their δ 13C in dried leaf tissue. All these taxa proved to be C4, plants with δ13C values ranging between -13,6°/oo and -10.9°/oo. These findings confirmed published leaf anatomical observations which showed that all the studied taxa had characteristic Kranz leaf anatomy.


carbon isotoperatios; Eragrostideae. Kranz syndrome


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