Specific inhibition of lignification breaks hypersensitive resistance of wheat to stem rust

When highly resistant wheat (Triticum aestivum L.) varieties are infected by an avirulent race of the stem rust fungus (Puccinia graminis Pers. f. sp. tritici Erics. and E. Henn.), penetrated host cells undergo rapid necrotization. This hypersensitive cell death is correlated with cellular lignifica...

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Bibliographic Details
Published in:Plant physiology (Bethesda) 1990-06, Vol.93 (2), p.465-470
Main Authors: Moerschbacher, B.M. (Institut fur Biologie III, Aachen, FRG), Noll, U, Gorrichon, L, Reisener, H.J
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
Biological and medical sciences
Cell growth
Enzymes
Fundamental and applied biological sciences. Psychology
Fungi
Genetics and breeding of economic plants
Hypersensitivity
Leaves
LIGNIFICACION
LIGNIFICATION
Lignin
Microbe-Plant Interactions
Mother cells
PARASITISME
PARASITISMO
Pest resistance
Plant pathogens
Plants
PODER INFECCIOSO
PODER PATOGENO
POUVOIR INFECTANT
POUVOIR PATHOGENE
PUCCINIA
RESISTANCE AUX MALADIES
RESISTENCIA A LA ENFERMEDAD
Rust fungi
TRITICUM AESTIVUM
VARIEDADES
Varietal selection. Specialized plant breeding, plant breeding aims
VARIETE
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Summary:When highly resistant wheat (Triticum aestivum L.) varieties are infected by an avirulent race of the stem rust fungus (Puccinia graminis Pers. f. sp. tritici Erics. and E. Henn.), penetrated host cells undergo rapid necrotization. This hypersensitive cell death is correlated with cellular lignification which efficiently restricts further fungal growth. Three competitive inhibitors of phenylalanine ammonia-lyase, the first enzyme of the general phenylpropanoid pathway and, thus, of lignin biosynthesis, namely alpha-aminooxyacetate, alpha-aminooxy-beta-phenylpropionic acid, and (1-amino-2-phenylethyl)phosphonic acid, and two highly specific irreversible suicide inhibitors of the lignification-specific enzyme cinnamyl-alcohol dehydrogenase, namely N(O-aminophenyl)sulfinamoyl-tertiobutyl acetate and N(O-hydroxyphenyl)sulfinamoyltertiobutyl acetate, were applied to genetically resistant wheat plants prior to inoculation with stem rust. Treatment with any of these inhibitors decreased the frequency of lignified necrotic host cells and concomitantly led to increased fungal growth. The cinnamyl-alcohol dehydrogenase inhibitors were generally more effective than the phenylalanine ammonia-lyase inhibitors, occasionally allowing some sporulation to occur on the resistant wheat leaves. These results clearly point to a causal relationship between the formation of lignin precursors and the resistance of wheat to stem rust
ISSN:0032-0889
1532-2548
DOI:10.1104/pp.93.2.465