In order to understand the roles of abscisis acid
in soybean exposed to UV-C radiation, soybean seedlings were
exposed to UV-C radiation and ABA was applied. The chlorophyll
content, active oxygen metabolism and flavonoids content of soybean
seedlings were investigated. The present study revealed that
UV-C radiation significantly attenuated the chlorophyll content
and suppressed PSII activity. It was observed that the contents of
H2O2, malondialdehyde and O2
- were markedly increased, and the
activities of antioxidant enzymes such as superoxide dismutase,
peroxidase and catalase were enhanced, so were the flavonoids
content, whereas the seedling height and biomass were significantly
reduced. ABA application improved the activities of superoxide
dismutase, peroxidase, catalase and the contents of flavonoids,
decreased the contents of H2O2, MDA and O2
-, and also increased
the chlorophyll content and enhanced PSII performance, thus
enhancing biomass accumulation. The results suggested that ABA
alleviated UV-C damage to soybean seedlings by reducing ROS
generation and enhancing antioxidase activity. The isoflavones
daidzin and genistein were significantly responsive to UV-C.
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