Articles
BIOLOGICAL ACTIVITY OF GUMS INDUCED IN TULIP (TULIPA GESNERIANA L.) BY FUSARIUM OXYSPORUM F. SP. TULIPAE, ETHYLENE AND JASMONATES
Article number
970_4
Pages
51 – 57
Language
English
Abstract
It is well known that Fusarium oxysporum f. sp. tulipae (Fot), ethylene and jasmonates have a promoting effect on gum induction and its accumulation in tulip (Tulipa gesneriana L.) bulbs.
The induction and production of gums are suggested to be regulated by a signal network of jasmonates and ethylene, especially by cross-talk between them.
Tulip gums consist of glucuronoarabinoxylan with an average molecular weight of approximately 700 kDa.
In this review some biological activity of tulip gums is presented.
It is believed that gums have a function in limiting the spread of fungal and bacterial pathogens and insects by isolating the infected tissues.
It was found that the addition of tulip gums at a concentration of 5 mgcm3 to Czapek-Dox-Agar, Malt-Extract-Agar and Potato-Dextrose-Agar greatly stimulated mycelium growth of Fusarium oxysporum f. sp. tulipae and sporulation of the pathogen.
Addition of tulip gums to the Czapek-Dox-Broth caused that the pathogen secreted the polysaccharide gum degrading enzymes.
In further studies it was found that tulip gums induced by Fusarium oxysporum f. sp. tulipae, ethylene or jasmonates elicited red coloured secondary metabolite(s) in mycelium of the pathogen.
The effect of homogenate of different tulip organs (scales, leaves, stem, pistils and roots), applied alone and simultaneously with tulip gums, on red pigment formation by mycelium of F. oxysporum f. sp. tulipae was investigated.
It is interesting that a homogenate of tulip scales and pistils almost totally inhibited the formation of the red coloured pigment induced by tulip gums in the mycelium of Fot. It is possible that the polysaccharide of tulip gums, which is glucuronoarabinoxylan, may act as an elicitor that regulates some physiological and biochemical processes connected or responsible for mycelium growth of the Fusarium oxysporum f. sp. tulipae and induction of secondary metabolites by mycelium of the pathogen.
The induction and production of gums are suggested to be regulated by a signal network of jasmonates and ethylene, especially by cross-talk between them.
Tulip gums consist of glucuronoarabinoxylan with an average molecular weight of approximately 700 kDa.
In this review some biological activity of tulip gums is presented.
It is believed that gums have a function in limiting the spread of fungal and bacterial pathogens and insects by isolating the infected tissues.
It was found that the addition of tulip gums at a concentration of 5 mgcm3 to Czapek-Dox-Agar, Malt-Extract-Agar and Potato-Dextrose-Agar greatly stimulated mycelium growth of Fusarium oxysporum f. sp. tulipae and sporulation of the pathogen.
Addition of tulip gums to the Czapek-Dox-Broth caused that the pathogen secreted the polysaccharide gum degrading enzymes.
In further studies it was found that tulip gums induced by Fusarium oxysporum f. sp. tulipae, ethylene or jasmonates elicited red coloured secondary metabolite(s) in mycelium of the pathogen.
The effect of homogenate of different tulip organs (scales, leaves, stem, pistils and roots), applied alone and simultaneously with tulip gums, on red pigment formation by mycelium of F. oxysporum f. sp. tulipae was investigated.
It is interesting that a homogenate of tulip scales and pistils almost totally inhibited the formation of the red coloured pigment induced by tulip gums in the mycelium of Fot. It is possible that the polysaccharide of tulip gums, which is glucuronoarabinoxylan, may act as an elicitor that regulates some physiological and biochemical processes connected or responsible for mycelium growth of the Fusarium oxysporum f. sp. tulipae and induction of secondary metabolites by mycelium of the pathogen.
Publication
Authors
M. Saniewski, A. Saniewska, A.J. Boncela, J. Góraj, E. Węgrzynowicz-Lesiak, H. Urbanek
Keywords
mycelium growth, Fusarium oxysporum f. sp. tulipae, elicitation, secondary metabolites, tulips, ethylene, jasmonates
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