Transient Induction of Phenylalanine Ammonia-Lyase and 4-Coumarate: CoA Ligase mRNAs in Potato Leaves Infected with Virulent or Avirulent Races of Phytophthora infestans - PubMed (original) (raw)

Transient Induction of Phenylalanine Ammonia-Lyase and 4-Coumarate: CoA Ligase mRNAs in Potato Leaves Infected with Virulent or Avirulent Races of Phytophthora infestans

K H Fritzemeier et al. Plant Physiol. 1987 Sep.

Abstract

Infection of potato leaves with the fungal pathogen Phytophthora infestans (Pi) resulted in the rapid stimulation of phenylpropanoid metabolism. Increases in the activities of several mRNAs, including those encoding phenylalanine ammonia-lyase (PAL) and 4-coumarate:CoA ligase (4CL), were detectable within a few hours postinoculation, as demonstrated by two-dimensional gel electrophoresis of proteins synthesized in vitro. This effect was closely mimicked by application of Pi culture filtrate through cut leaf stems. PAL and 4CL mRNA activities were also rapidly and transiently induced in potato cell suspension cultures by treatments with Pi culture filtrate or arachidonic acid. This induction was exploited to generate cDNA probes complementary to PAL and 4CL mRNAs. Blot hybridizations using these probes revealed almost immediate, transient and coordinate increases in the transcription rates and subsequent changes in the amounts of PAL and 4CL mRNAs in leaves treated with Pi culture filtrate. Similar changes in the mRNA amounts were found in infected leaves of potato cultivars carrying resistance genes R1 (cv Datura) or R4 (cv Isola), independent of whether a virulent or an avirulent Pi pathotype was used for inoculation. These results are discussed in relation to recent cytological observations with the same potato cultivars and Pi pathotypes.

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