Abstract
Phytohormones are small molecules that regulate almost all aspects of plant life including defence reactions. Plant defence and immunity are mainly regulated by two hormones - salicylic acid (SA) and jasmonic acid (JA). Other hormones such as auxins, cytokinins brassinosteroids or gibberellins modulate plant immunity to lesser extent. It has been described that plant pathogens are able to interfere with plant hormone signalling to overcome plant defence. Some pathogens are able to produce plant hormones themselves. This thesis is focused on plant hormone signalling involved in plant immunity both from the plant side and pathogen side and possible hormonal crosstalk in this interaction. The first part is focused on salicylic acid signalling connected with plant actin cytoskeleton roles in plant immunity. It has been described that desintegration of actin cytoskeleton leads to increased plant susceptibility to bacteria. However, it has been also shown that pharmacological desintegration of actin filaments induces transcription of salicylic acid responsive genes PR1 (Pathogenesis related 1) and ICS1 (Isochorismate synthase 1). In this thesis we have investigated this inconsistency using actin depolymerizing drugs latrunculin B, cytochalasin E and jasplakinolide and two different pathosystems:...
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