Combined stresses of light and chilling on photosynthesis of Fraxinus mandschurica seedlings in northeastern China
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The chilling and light stresses were experimentally created to explore photosynthesis of Fraxinus mandshurica seedlings in northeast China. Net photosynthetic rate, stomatal conductance, and transpiration rate decreased significantly with the decline of temperature and light. Significant interaction effects of light and chilling were observed on gas exchange of photosynthesis. The minimal fluorescence yield of the dark-adapted state (F0) increased with increasing light and decreasing temperature. Both high and low light stresses induced the decreases of the maximal quantum yield of PSII photochemistry (Fv/Fm), photochemical quenching coefficient (qP), nonphotochemical quenching (NPQ), and electron transport rate. Decline of Fv/Fm and increased F0 were observed under decreasing temperatures. Decreased NPQ and qP at frost temperature suggest that F. mandschurica failed to dissipate excess light energy. No interactive effects of chilling and light on chlorophyll fluorescence parameters suggests that F. mandschurica seedlings might be adapted to combined stresses of light and chilling.
Additional key wordschlorophyll fluorescence early-spring chilling net photosynthetic rate temperate zone
intercellular CO2 concentration
electron transport rate
minimal fluorescence yield of the dark-adapted state
maximal fluorescence yield of the dark-adapted state
maximum fluorescence in the light-adapted state
initial fluorescence in the light-adapted state
maximal quantum yield of PSII photochemistry
net photosynthetic rates
photochemical quenching coefficient.
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