Effects of Drought Stress on Growth and Photosynthetic Physiological Characteristics of Chrysanthemum morifolium'Jiju'
Four different water control gradients including normal level,light drought,moderate drought and severe drought were set up in this experiment,the changes of growth indexes and photosynthetic physiological parameters of Chrysanthemum morifolium'Jiju'under different drought stress conditions were studied so as to provide reference for its standardized cultivation.With the aggravation of drought stress and the persistence of time,the biomass and the relative water content of the plant decreased,while the chlorophyll content increased first and then decreased.The photosynthetic rate,transpiration rate,stomatal conductance and intercellular carbon dioxide concentration all showed a decreasing trend in general,but the intercellular carbon dioxide concentration had a process of first increasing and then decreasing under severe drought.The activities of superoxide dismutase,peroxidase and catalase all showed an upward trend and then a downward trend.C.morifolium'Jiju'can sustain drought tolerance for 21 days under severe drought stress,which shows that it has strong drought resistance,and it also shows that C.morifolium'Jiju'can maintain physiological metabolism to adapt to drought environment by protecting enzyme to realize self-regulation.
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