Reference "Cultivar-specific elicitation of barley defense reactions by the phytotoxic peptide NIP1 from Rhynchosporium secalis"

Reference ID

8721

Title

Cultivar-specific elicitation of barley defense reactions by the phytotoxic peptide NIP1 from Rhynchosporium secalis

Source

Molecular plant-microbe interactions : MPMI, 1993, vol. 6, pp. 745-754

Authors (3)

Hahn-M	Jungling-S
Knogge-W

Abstract

Resistance of barley to the phytopathogenic fungus, Rhynhosporium secalis race
US238.1, was found to be controlled by resistance gene Rrs1, which segregated in
a manner characteristics for a codominant gene. PRHv-1, a thaumatin-like pathogenesis-
related protein, was shown to be encoded by a gene family on chromosome 1. As
part of the barley defense response, significant accumulation of PRHv-1 and
peroxidase transcripts was induced early during pathogenesis in two Rrs1
cultivars but not or to a lower level in a near-isogenic, susceptible rrs1
cultivar or a cultivar lacking known resistance genes. R. secalis secretes a
small group of necrosis-inducing peptides. One of these, NIP1, which was
detected in culture filtrates only of fungal race US238.1, was found to elicit
the accumulation of PRHv-1 and peroxidase mRNAs in Rrs1 cultivars with a time
course similar to that upon fungal infection. Therefore, NIP1 is a candidate for
the product of fungal avirulence gene avrRrs1, which, together with barley
resistance gene Rrs1, determines incompatibility of the interaction.