Query (optional)   in Class  All Allele Author Colleague Collection Assembly Gene Gene Class Gene Product Germplasm Image Journal Keyword Library Locus Map Map Data Marker Pathology Polymorphism Probe Protein QTL Rearrangement Reference Sequence Species Trait Trait Study Two Point Data  

---

GrainGenes Reference Report: PMP-44-433

[Submit comment/correction]

Reference	PMP-44-433
Title	Earlier papilla formation and resistance to barley powdery mildew induced by a papilla-regulating extract
Journal	Physiology and Molecular Plant Pathology
Year	1994
Volume	44
Pages	433-440
Author	Inoue S Aist J Macko V
Abstract	Timing of papilla formation has been suggested to be an important factor for papilla-mediated resistance Formation of oversize papillae and resistance to penetration attempts by the powdery mildew fungus have been reported to be induced in inoculated epidermal cells of susceptible barley coleoptiles by a partially purified, papilla-regulating extract (PRE) from healthy barley leaves A time-course study was conducted to determine whether or not early papilla formation may be an important component of this PRE-induced resistance Inoculated, susceptible barley coleoptiles were incubated on the PRE in a 10 mM Ca(NO3)2 solution The timing of initiation and termination of cytoplasmic aggregates, initiation of papillae, initiation of fungal penetration pegs and initiation of haustoria were determined in vivo using differential interference contrast optics On average, papilla formation was initiated 23-27 min earlier in the PRE treatment than in controls incubated without the PRE An individual site-based analysis showed that PRE treatment of coleoptiles increased, from 23% to 68%, the frequency of earlier-formed papillae that fungal penetration pegs encountered when they were first detected. Thus, early initiation of papilla formation is a component of the PRE-mediated resistance to barley powdery mildew. However, since papillae in the PRE-treated coleoptiles were highly effective in preventing penetration regardless of their time of initiation, it appears that papilla content may be more important than earliness in determining their efficacy.
Keyword	coleoptile [ Show all 12 ]

GrainGenes is a product of the Agricultural Research Service of the US Department of Agriculture.