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Carl-Otto Ottosen

Differential effects of elevated air humidity on stomatal closing ability of Kalanchoë blossfeldiana between the C3 and CAM states

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  • Dimitrios Fanourakis, Institute of Olive Tree, Subtropical Plants and Viticulture, Hellenic Agricultural Organization ‘Demeter’ (NAGREF), Grækenland
  • Benita Hyldgaard
  • ,
  • Habtamu Giday Gebraegziabher, Horticulture and Product Physiology Group, Wageningen University
  • ,
  • Dimitris Bouranis, Plant Physiology and Morphology Laboratory, Crop Science Department, Agricultural University of Athens, Grækenland
  • Oliver Körner, Danish Technological Institute, AgroTech
  • ,
  • Kai Lønne Nielsen
  • Carl-Otto Ottosen

High relative air humidity (RH ≥ 85%) impairs stomatal functionality, attenuating plant capacity to cope with abiotic stress. Previous studies were limited to C 3 species, so the RH effect on stomatal physiology of CAM plants remains unexplored. We addressed the topic through comparisons of C 3 and CAM states in a facultative CAM species. These states were validated by diel measurements of net assimilation rate and malate level. In the first two experiments, three Kalanchoë interspecific hybrid cultivars were exposed to moderate (60%) or high (90%) RH. Both leaves that expanded at high RH and leaves that had expanded at moderate RH and were subsequently exposed to high RH (for nine days) showed increased stomatal conductance. In the third experiment, both C 3 and CAM state plants of one K. blossfeldiana cultivar were exposed to low (40%), moderate (60%) or high (90%) RH. Plant transpiration during night-time was inversely related to ambient RH in either state, whereas during day-time a significant effect was only noted at 90% RH. Kalanchoë leaves showed a very effective control of water loss upon water deprivation, especially in the CAM state. Following a single week exposure to 90% RH, detached leaves showed increased rates of water loss during desiccation in C 3 state plants. No effect of high RH on stomatal response to desiccation was noted in leaves detached from plants in CAM-state. It is concluded that the negative effect of either growth or one-week exposure to high RH is restricted to the C 3 state in Kalanchoë.

OriginalsprogEngelsk
TidsskriftEnvironmental and Experimental Botany
Vol/bind143
Sider (fra-til)115-124
Antal sider10
ISSN0098-8472
DOI
StatusUdgivet - 12 sep. 2017

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