A preliminary study on the photosynthetic induction response ofQuercus serrata seedlings |
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Authors: | Tang Yanhong Hiroshi Koizumi Izumi Washitani Hideo Iwaki |
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Institution: | (1) Division of Plant Ecology, National Institute of Agro-Environmental Sciences, 305 Tsukuba, Japan;(2) Institute of Biological Sciences, University of Tsukuba, 305 Tsukuba, Japan |
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Abstract: | To understand the sunfleck utilization of leaves in heliophilic trees within grass canopies, we studied the photosynthetic
induction response ofQuercus serrata seedlings grown for 5 months in different microsites in aMiscanthus sinensis canopy. Two phases, a rapid increase in CO2 uptake and a following slow increase, were recognizabie in the time course of CO2 uptake in response to an increase of photon flux densities (PFD). When the preceding period of low light became shorter,
the period of the two phases became shorter. The capacity of response to a sudden light increase was evaluated by the relative
photosynthetic induction efficiency (RPIE) defined as the ratio of integrated carbon gain measured to that calculated by assuming
that a steady-state assimilation would be achieved instantaneously after the light increase. RPIEs estimated were negatively
related to potential sunfleck PFD of microsite. The leaves of the seedlings grown in the microsite with a lower sunfleck PFD
and a shorter sunfleck duration showed a more rapid response to a sudden increase of light. These findings suggest that the
leaves ofQ. serrata seedlings growing under a lower sunfleck PFD are able to increase the photosynthetic capacity more rapidly to an increase
of PFD. |
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Keywords: | Assimilation Light Microsite Photosynthetic induction Sunfleck |
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