Does the C4 plant Trianthema portulacastrum (Aizoaceae) exhibit weakly expressed crassulacean acid metabolism (CAM)?

Functional Plant Biology : FPB
Klaus WinterJoseph A M Holtum

Abstract

We examined whether crassulacean acid metabolism (CAM) is present in Trianthema portulacastrum L. (Aizoaceae), a pantropical, salt-tolerant C4 annual herb with atriplicoid-type Kranz anatomy in leaves but not in stems. The leaves of T. portulacastrum are slightly succulent and the stems are fleshy, similar to some species of Portulaca, the only genus known in which C4 and CAM co-occur. Low- level nocturnal acidification typical of weakly expressed, predominantly constitutive CAM was measured in plants grown for their entire life-cycle in an outdoor raised garden box. Acidification was greater in stems than in leaves. Plants showed net CO2 uptake only during the light irrespective of soil water availability. However, nocturnal traces of CO2 exchange exhibited curved kinetics of reduced CO2 loss during the middle of the night consistent with low-level CAM. Trianthema becomes the second genus of vascular land plants in which C4 and features of CAM have been demonstrated to co-occur in the same plant and the first C4 plant with CAM-type acidification described for the Aizoaceae. Traditionally the stems of herbs are not sampled in screening studies. Small herbs with mildly succulent leaves and fleshy stems might be a numerically sig...Continue Reading

References

Oct 1, 2007·American Journal of Botany·Joseph A M HoltumTimothy R Sexton
Mar 1, 2007·American Journal of Botany·Riyadh MuhaidatNancy G Dengler
Feb 8, 2013·Annals of Botany·Riyadh Muhaidat, Athena D McKown
Nov 22, 2013·American Journal of Botany·Gilberto OcampoJ Travis Columbus
Mar 19, 2014·Journal of Experimental Botany·Pascal-Antoine ChristinErika J Edwards
Aug 3, 2016·Journal of Plant Physiology·Rowan F Sage, Stefanie Sultmanis
May 17, 2017·Journal of Plant Physiology·Joseph A M HoltumKlaus Winter
Dec 12, 2018·Journal of Experimental Botany·Klaus WinterJoseph A M Holtum
Feb 28, 2019·Journal of Experimental Botany·Klaus Winter
Mar 2, 2019·Journal of Experimental Botany·Klaus WinterJoseph A M Holtum
Jul 1, 2015·Functional Plant Biology : FPB·Klaus Winter, Joseph A M Holtum
Jul 1, 2005·Functional Plant Biology : FPB·Klaus WinterJoseph A M Holtum
Jun 1, 2002·Functional Plant Biology : FPB·Rowan F Sage

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