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Abstract Detail



Pteridological Section/AFS

Wu, Tai-Chung [1], Kao, Wen-Yuan [1].

Stomatal response in leaves of Marsilea crenata, an amphibious fern.

Stomata are important for terrestrial plants to regulate gas exchange between leaves and atmosphere. Stomata of angiosperm show active response to blue light, variation in CO2, and abscisic acid (ABA). Recently, some researchers found no such response in stomata of some fern species and suspected that fern species have no active stomatal control. Marsilea crenata, an amphibious fern, is distributed mainly in southeastern Asia, including Taiwan. In this study, we investigated the response of stomatal conductance (gs) of this fern to CO2 variation, blue light, and exogenous ABA. Stomatal conductance of leaves of terrestrial grown plants was measured with a gas exchange system. The results showed that gs decreased with increasing in [CO2] from 100 to 600 ppm, while gs remained unchanged when [CO2] was further increased from 600 to 1200 ppm. A doubling of CO2 concentration from 400 to 800 ppm caused a mean reduction of 41.5% in gs. When the stomatal conductance had reached a steady-state value under a saturation red light condition, the application of blue light (50 μmol m-2s-1) further increased gs, with a mean increment of 55.6%. The exogenous application of ABA also induced stomatal closure, resulting in a reduction of 37.6% of gs. These results indicated that M. crenata has active stomatal control.

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1 - Institute of Ecology and Evolutionary Biology, National Taiwan University, Taipei, Taiwan

Keywords:
fern
Marsilea
Active stomatal control
Blue light
CO2
Abscisic acid.

Presentation Type: Poster:Posters for Sections
Session: P
Location: Grand Salon A - D/Riverside Hilton
Date: Monday, July 29th, 2013
Time: 5:30 PM
Number: PPD002
Abstract ID:226
Candidate for Awards:None


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