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Roles of an altered porphyrin biosynthesis and antioxidants in protection against chilling and heat stresses were evaluated in rice ( Oryza sativa L.). When exposed to the same exposure time (6 or 30 h), heat-stressed (45 °C) plants exhibited a less oxidative stress as indicated by a lower dehydration, ion leakage, and H 2 O 2 production compared to chilling-stressed...
Maize catalase (CAT) mutants lacking in CAT isozymes were used to investigate the response of CAT and superoxide dismutase (SOD) to norflurazon (NF) caused oxidative stress in 18-d post-pollination scutella. NF treatment caused an increase in malonyldialdehyde content, which is an indicator of oxidative stress, and a decrease in a content of photoprotectant carotenoids in the scutella. CAT activity...
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