Using combined measurements for comparison of light induction of stomatal conductance, electron transport rate and CO2 fixation in woody and fern species adapted to different light regimes

摘要: We aimed to understand the relation of photosynthetic rate (A) with gs and electron transport (ETR) in species great taxonomic range light adaptation capability during induction. studied three woody (Alnus formosana, Ardisia crenata cornudentata) four fern (Pyrrosia lingus, Asplenium antiquum, Diplazium donianum Archangiopteris somai) different capabilities. Pot-grown materials received 100 and/or 10% sunlight according their At least 4 months after acclimation, CO2 H2O exchange chlorophyll fluorescence were measured simultaneously by equipment laboratory. In plants adapted or acclimated low light, dark-adapted leaves exposed 500 2000 µmol m −2 s −1 photon flux (PPF) for 30 min showed gross (Pg) short time required reach 90% maximum Pg (T P 9 g 0 ). initiation illumination, two broad-leaved understory shrubs ferns, especially ferns heavy shade, higher stomatal conductance (gs) than pioneer tree species; had T at both PPF. With PPF, increased from 2 start but little change ferns. Thus, not correlated all material same PPF induction time. However, was positively ETR, even though assimilation may be influenced stomatal, biochemical photoinhibitory limitations. addition, closely related maximal ETR levels combined. is a good indicator estimating species, across wide acclimation capability.