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KMID : 0903619980390020145
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Journal of the Korean Society for Horticultural Science
1998 Volume.39 No. 2 p.145 ~ p.148
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Change of Stomatal Behavior and Chlorophyll Fluorescence to Environmental Conditions in Ginger (Zingiber officinale Rosc)
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김기영/Kim, Ki Young
최인록/현동윤/김수동/박문수/Choi, In Lok/Hyun, Dong Yun/Kim, Soo Dong/Park, Moon Soo
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Abstract
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We determined photosynthetic parameters to microclimatic change of ginger with a short-term in a controlled-environment chamber within which individual leaves were enclosed in a cuvette. In relationship between stomatal conductance for CO₂(g_(sc)) and transpiration (t_r), g_(sc) increased rapidly as irradiance increased from zero, and saturated at relatively low values of light intensity (400 μ㏖·m^(-2)·s^(-1)). Under series of leaf temperature, g_(sc) showed peaked response to 29℃, but t_r increased with the increased irradiance and temperature. Increasing external CO₂ concentrations caused g_(sc) and t_r to decrease, and also g_(sc) was relatively insensitive to increasing soil moisture availability until a threshold was reached (0.5-2.0 g·g^(-1)), whereupon in 2.0-3.5g·g^(-1) regime, g_(sc) increase approximately linearly with increasing transpiration. Fluorescence parameter Fv/Fm of electron transfer in PS II decreased sharply with increasing photon flux density (PFD) on regime from 100 to 600 μ㏖·m^(-2)·s^(-1) with step of 100 μ㏖·m^(-2)·s^(-1). After exposure to increasing leaf temperature, its value was high at above 25℃. Fv/Fm was maximally induced between 25℃ and 37℃, in compared with the low temperature (15℃). These results suggested that temperature and soil water content are one of determining factors during growth period.
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