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Biologia Plantarum

, Volume 12, Issue 3, pp 236–239 | Cite as

Effect of cholesterol and stigmasterol on symptom manifestation of potato witches broom —A disease which is supposed to be caused byMycoplasma

  • Marie Ulrychová
  • J. Limberk
Brief Communication

Abstract

Evidence for the effect of sterols on plant mycoplasma is presented. Two essential sterolsi.e. cholesterol and stigmasterol were applied in the following way: grafts from tomato plants infected with potato witches'broom, wedge-shaped at the base were dusted on the cut surfaces with the corresponding sterol in the amount of 4 mg to one graft, inserted in freshly cut wedges of stock plants and firmly tightened with rubber tubes. Both sterols stimulated growth of diseased grafts and delayed symptom manifestation. The stimulation was more evident with stigmasterol and the delay in symptom manifestation and intensity was more distinct with cholesterol. Supplying tomato plants with sterols externally probably enables additional multiplication of mycoplasma in already infected grafts, and the plants need not provide the grafts with essential metabolites which they themselves need for the development of reproductive organs. Stigmasterol, a metabolite peculiar to the tomato plant, is probably more rapidly consumed than cholesterol which may remain in the plant as a metabolic pool of sterols for mycoplasma propagation.

Keywords

Tomato Plant Broom Stigmasterol Aster Yellow Metabolic Pool 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Účlnek cholesterolu a stigmasterolu na projev symptomů metlovitosti bramboru — onemocnêní, za jehož původee je pokládánaMycoplasma

Abstract

V práci je prokázán účinek sterolů na fytopatogenní mykoplasmu. Dva základní steroly, a to cholesterol a stigmasterol, byly aplikovány tak, že rouby z nemocných rostlin, v bazální části klínovitê seříznuté, byly na řezných plochách popráŝeny přísluŝným sterolem v množství 4 mg na jednu rostlinu, vsunuty do čerstvê vyříznutých klínů podnoží a pevnê staženy gumovými hadičkami. Oba steroly stimulovaly růst nemocných roubů a brzdily projevení příznaků. Stimulace byla výraznêjŝí u stigmasterolu a inhibice projevu příznaků a jejich intensity byla silnêjŝí u cholesterolu. Dodání sterolů zevnê umožňuje pravdêpodobnê dalŝí množení mykoplasmy v roubech již nakažených a rostliny nemusejí dodávat esenciální metabolity, které samy potřebují pro vývoj reprodukĉních orgánů. Stigmasterol, který je metabolitem rostlinê vlastním, je pravdêpodobnê rychleji odbouráván než cholesterol, který v rostlinê zůstává jako pohotová zásoba (metabolic pool) sterolů pro množení mykoplasmy.

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Copyright information

© Institute of Experimental Botany 1970

Authors and Affiliations

  • Marie Ulrychová
    • 1
  • J. Limberk
    • 1
  1. 1.Department of Plant Pathology, Institute of Experimental BotanyCzechoslovak Academy of SciencesPraha

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