Welwitschia mirabilis: CAM or not CAM - what is the answer?

Functional Plant Biology : FPB
D J Von WillertMaik Zaborowski

Abstract

After more than 20 years of extensive study we found clear evidence that Welwitschia mirabilis Hook.f. is able to take up CO2 at night in both of its natural ecosystems, the Namib desert and the Mopane savannah, and hence should be classified a crassulacean acid metabolism (CAM) plant. At six different sites, 85 W. mirabilis plants were marked and the growth rate of their leaves and leaf ribbons were measured over a period of 2.5 years. The slowest and the fastest growing plant of these 85 plants were from the Mopane savannah and from the north-west of the Brandberg massif, respectively. These were selected for the gas-exchange measurements of this study. Within the course of a year nocturnal CO2 uptake was found only in December and January when the nights were shortest and plants were flowering. CO2 uptake during the night was not pronounced and never accounted for more than 4% of the total CO2 uptake over 24 h. Maximum rates of nocturnal CO2 uptake never exceeded 0.1 µmol m-2 s-1 for the slowest and 0.2 µmol m-2 s-1 for the fastest growing plant. Neither water availability in the soil nor night temperature was found to determine nocturnal CO2 uptake in terms known for CAM plants. Regardless of the growing site all leaves of ...Continue Reading

Citations

May 16, 2015·The New Phytologist·Klaus WinterJ Andrew C Smith
Jul 14, 2010·Genome Biology and Evolution·Angélica Cibrián-JaramilloRob DeSalle
Jul 1, 2005·Functional Plant Biology : FPB·John C Cushman
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