Участие каталазы и пероксидазы в повышении устойчивости пшеницы к низкой температуре (original) (raw)

Участие каталазы и пероксидазы в повышении устойчивости пшеницы к низкой температуре

2018

Abstract

The dynamics of catalase (CaT) and guaiacol peroxidase (POD) activity in winter wheat ( Triticum aestivum L.) leaves under exposure to a low hardening temperature of 4 ° C for 7 days was studied. It was established that the freezing tolerance of the seedlings increased already after 1 hour of exposure, and then continued to grow, reaching a maximum on the 7 th day. The content of malondialdehyde increased slightly during the first 2 days of cold exposure and then declined, possibly pointing to attenuation of the oxidative stress in plant cells. It was also found that the activity of one of the key antioxi dant enzymes involved in hydrogen peroxide (h 2 O 2 ) recycling – CaT, increased after 1 hour of cold exposure. CaT activity then continued to increase, reaching a maximum on the 2 nd day, with a decline following afterwards. along with this, POD activity increased throughout the cold hardening period. In addition, a slight increase in H 2 O 2 content in leaves was detected d...

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