Resistance in plants may be divided into local and systemic. The systemic resistance can be in two types: systemic acquired resistance (SAR) and induced systemic resistance (ISR). Effects of both these types of resistance are similar – it is expression of pathogenesis-related proteins (of PR proteins). The differences between SAR and ISR are connected mainly with mechanisms of their acquisition, to which more and more attention has been paid recently. In the article selected some aspects of mechanisms of SAR acquisition are discussed in which the following factors take part: salicylic-acid-binding protein, phosphorylation chain in the cytoplasmatic membrane, activation of calcium channels in the cytoplasmatic membrane, activation of G proteins, oxygen burst.

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