how cytokinin acts as a barrier to different pathgens by providing resistance to extreme temperature and pathogens?

Dear student.

Cytokinin increases resistance to high or low temperature and disease by maintaining the up-regulation and down-regulation of various genes (for example SARK promoter, ipt gene, histidine kinase etc), by maintaining Na-K ratio etc.

The exact mechanism you will be studying in your higher grades.

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Regards. 

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