NDLI: Elicitor-induced changes of phenylalanine ammonia-lyase activity in barley cell suspension cultures

Content Provider	Springer Nature Link
Author	Peltonen, Sari Mannen, Leena Karjalainen, Reijo
Copyright Year	1997
Abstract	Suspension-cultured barley cells responded to treatments with crude yeast extract and purified glucan preparation by rapidly and transiently (4 h postelicitation) inducing L-phenylalanine ammonia-lyase activity. Similarly, treatment of cell cultures with chitosan resulted in increased phenylalanine ammonia-lyase activity 2–4 h after elicitation, whereas a mycelium preparation of a fungal pathogen, Bipolaris sorokiniana, and purified chitin caused a more delayed induction of phenylalanine ammonia-lyase (8 h postelicitation). The most abundant of the plant cell wall degrading enzymes produced by Bipolaris sorokiniana, β-1,4-xylanase, had only a weak elicitor activity in barley cells suggesting that fungal cell wall components rather than the hydrolytic enzymes secreted by the fungus function as recognizable components that cause barley cells to induce defences. Treatment of the elicited cells with a phenylalanine ammonia-lyase inhibitor, α-aminooxy-β-phenylpropionic acid, resulted in the superinduction of the enzyme indicating the blocking of the feedback regulation mechanisms, whereas in the presence of 1 mM trans-cinnamic acid the elicitor-induction of phenylalanine ammonia-lyase was completely inhibited. Elicitor treatments increased the accumulation of wall-bound phenolics as evidenced by phloroglucinol-HCl staining and thioglycolic acid methods. However, α-aminooxy-β-phenylpropionic acid applied in combination with the elicitor did not prevent the accumulation of phenolics in barley cell walls. This suggested that phenylalanine ammonia-lyase might not play an important role in the synthesis wall-bound phenolic compounds in barley. However, cinnamic acid, whether applied alone or together with the elicitor, increased the amount of wall-bound phenolics in suspension-cultured barley cells.
Starting Page	185
Ending Page	193
Page Count	9
File Format	PDF
ISSN	01676857
Journal	Plant Cell, Tissue and Organ Culture (PCTOC)
Volume Number	50
Issue Number	3
e-ISSN	15735044
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	1997-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Plant Sciences Plant Physiology
Content Type	Text
Resource Type	Article
Subject	Horticulture

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