LieÄÂivé rastliny v meniacich sa environmentálnych podmienkach
LieÄÂivé rastliny v meniacich sa environmentálnych podmienkach
LieÄÂivé rastliny v meniacich sa environmentálnych podmienkach
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Vliv biotických a abiotických stresorů na vlastnosti rostlin<br />
11.5.2005<br />
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Protective cytokinin action switches to damaging during senescence of detached wheat<br />
leaves in continuous light. Physiol Plant, v recenzním řízení.<br />
/14/ Špundová M, Popelková H, Ilík P, Skotnica J, Novotný R, Nauš J (2003): Ultrastructural<br />
and functional changes in the chloroplasts of detached barley leaves senescing under dark<br />
and light conditions. J Plant Physiol 160, 1051–1058<br />
Effect of exogenous application of cytokinins on pathogenesis of Bremia<br />
lactucae and photosynthetic parameters of host plant<br />
Key words: Bremia lactucae – carotenoids – chlorophylls – Lactuca <strong>sa</strong>tiva –lipid<br />
peroxidation – photosystem II<br />
Summary<br />
Exogenous application of cytokinin solutions (2.10 -4 M meta-topolin and riboside 3-<br />
MeOBAPR) on detached leaf discs of susceptible plants Lactuca <strong>sa</strong>tiva L. (Cobham Green)<br />
24 h before inoculation suppressed sporulation and conidia formation of Bremia lactucae<br />
(cau<strong>sa</strong> agent of lettuce downy mildew). In host leaf tissue, the effect of cytokinin application<br />
on changes in photosynthetic parameters (chlorophyll and carotenoid content, photochemical<br />
efficiency of photosystem II) and cell membranes (level of lipid peroxidation) induced by<br />
senescence and pathogenesis was studied. The exogenous application of cytokinins did not<br />
influence the decrease in chlorophyll and carotenoid content induced by senescence.<br />
Cytokinins stimulated the decrease in the efficiency of PSII in the non-infected leaf discs,<br />
whereas in the infected ones they suppressed it. The exogenous application of cytokinins<br />
reduced the increase in lipid peroxidation in both infected and non-infected leaf discs.<br />
Poděkování<br />
Tyto výsledky jsou součástí projektu financovaného výzkumným záměrem MŠMT ČR č.<br />
MSM 6198959215 a GAČR 522/02/D011.<br />
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