[Effects of chilling stress under weak light on functions of photosystems in leaves of wild soybean and cultivatar soybean].

By simultaneously analyzing chlorophyll a fluorescence transient and light absorbance at 820 nm, and detecting activities of superoxide dismutase (SOD) and ascorbate peroxidase (APX), the effects of chilling stress under weak light on functions of photosystem I (PSI) and photosystem II (PSII) in leaves of a wild type soybean variety 'ZYD00019' and a cultivar soybean variety 'Zaoshu No.1' were investigated. The results showed that the functions of both PSI and PSII were damaged by the chilling stress under weak light. The higher tolerance to chilling stress under weak light in the wild soybean might be due to its higher activities of SOD and APX and its stability and coordination of its PSI and PSII.