[Effects of sub-low temperature and drought stress on characteristics of photosynthetic and fluorescence kinetics in tomato leaves].

By using tomato as material potted in climatic chamber, the photosynthetic characteristics and allocation of energy and electron flow were studied under sub-low temperature (8-15 °C) and drought (55%-65% of field moisture capacity) conditions. The results showed that the photosynthetic pigment content declined under sub-low temperature stress, but increased under drought stress. Both sub-low temperature stress and drought stress significantly decreased the intercellular CO2 concentration, stomatal conductance and photosynthetic rate, and increased the stomatal limita- tion, which further decreased or increased under simultaneous treatment of sub-low temperature and drought stress.