Responses of photosynthesis and respiratory metabolisms to waterlogging in Aegiceras corniculatum
Mangrove forest is a special woody plant community that occurs in the intertidal zone of tropical and subtropical coasts,possessing enormous economic and ecological value.In this study,artificial tidal systems(0 h,6 h,12 h,18 h)were employed to evaluate the effects of waterlogging on photosynthesis and respiration metabolism of the seedlings of Aegiceras corniculatum.The results showed that the values of Fv/Fm were significantly decreased under waterlogging.In addition,with the elongation of tidal flooding,the data of Yield showed a downward trend although there was no significant difference among the treatments.Waterlogging also significantly decreased the contents of ATP in the roots of Aegiceras corniculatum.The results of TCA respiration further showed that waterlogging significantly reduced TCA respiratory rate,coinciding with the inhibitions of succinate dehydrogenase(SDH)and malate dehydrogenase(MDH)activities.On the contrary,the activities of alcohol dehydrogenase(ADH)and lactate dehydrogenase(LDH)were significantly promoted by waterlogging,and with the maximum activities at the highest waterlogging rhythm(18h).The data of the present study indicated that although anaerobic respiration might partly alleviate the ATP deficiency caused by waterlogging,excessive waterlogging can still disrupt the normal photosynthesis and ATP productivity efficiency.
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