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

tree physiology

Using combined measurements for comparison of light induction of stomatal conductance, electron transport rate and CO 2  fixation in woody and fern species adapted to different light regimes