Abstract
Carbamide and thiocarbamide decreased the resistance of apple to apple scab when infiltrated into apple leaves prior to infection with the disease. In three apple varieties these two substances strikingly stimulated infection with two monosporic isolates of the fungusVenturia inaequalis (Cke.) Wint. It was established that both carbamide and thiocarbamide inhibited polyphenol oxidase activity in apple leavesin vivo, butin vitro only thiocarbamide was inhibitory. It can be concluded that the effect on apple resistance to apple scab is based on an inhibition of polyphenol oxidase.
Abstract
Karbamid a thiokarbamid infiltrované před infekeí do jabloňových listů vyvolaly snížení resistence jabloně ke strupovitosti. U třech odrůd jabloně obě tyto látky výrazně stimulovaly infekei dvěma monosporickými isoláty houbyVenturia inaequalis (Cke.) Wint. Bylo zjištěno, žein vivo karbamid i thiokarbamid inhibovaly aktivitu polyfenoloxidasy v listech jabloně, avšakin vitro působil inhibičně pouze thiokarbamid. Z výsledků lze předpokládat, že ovlivnění resistence jabloně ke strupovitosti karbamidem a thiokarbamidem je způsobeno inhibicí tohoto enzymu.
Abstract
Инфильтрация карбамида и тиокарбамида в листья яблони перед инфекцией понизила сопротивляемость яблони парше. У трех сортов яблони оба вещества резко стимулировали инфекцию двумя моноспорическими изолятами грибаVenturia inaequalis (Cke.)Wint.In vivo карбамид и тиокарбамид подавляли активность полифенолоксидазы в листьях яблони.in vitro лишь тиокарбамид ингибировал действие фермента. Из полученных результатов вытекает, что действие карбамида и тиокарбамида на сопрот яблони нарше можно объяснить ингибированием полифенолоксидазы.
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Hanušová, M. The effect of carbamide and thiocarbamide on the resistance of apple to apple scab. Biol Plant 11, 1–7 (1969). https://doi.org/10.1007/BF02920725
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DOI: https://doi.org/10.1007/BF02920725