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Titolo:
Signaling organogenesis in parasitic angiosperms: Xenognosin generation, perception, and response
Autore:
Keyes, WJ; OMalley, RC; Kim, D; Lynn, DG;
Indirizzi:
Univ Chicago, Searle & Jones Chem Lab, Chicago, IL 60637 USA Univ ChicagoChicago IL USA 60637 & Jones Chem Lab, Chicago, IL 60637 USA
Titolo Testata:
JOURNAL OF PLANT GROWTH REGULATION
fascicolo: 2, volume: 19, anno: 2000,
pagine: 217 - 231
SICI:
0721-7595(200006)19:2<217:SOIPAX>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
CHRONIC GRANULOMATOUS-DISEASE; BINDING ACTIVITY INVITRO; STIMULATED NADH OXIDASE; CORN ROOT PROTOPLASTS; MAYS-L ROOTS; PLASMA-MEMBRANE; PLANT DEVELOPMENT; FERRICYANIDE REDUCTION; REDOX REGULATION; STRIGA-ASIATICA;
Keywords:
Striga asiatica; parasitic angiosperms; signal transduction; organogenesis; haustorial development; benzoquinones; xenognosin;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
100
Recensione:
Indirizzi per estratti:
Indirizzo: Lynn, DG Univ Chicago, Searle & Jones Chem Lab, 5735 Ellis Ave, Chicago, IL 60637 USA Univ Chicago 5735 Ellis Ave Chicago IL USA 60637 go, IL 60637 USA
Citazione:
W.J. Keyes et al., "Signaling organogenesis in parasitic angiosperms: Xenognosin generation, perception, and response", J PL GR REG, 19(2), 2000, pp. 217-231

Abstract

Parasitic strategies within the angiosperms generally succeed by tightly coupling developmental transitions with host recognition signals in a process referred to as xenognosis. Within the Scrophulariaceae, Striga asiatica is among the most studied and best understood parasitic member with respect to the processes of host recognition. Specific xenognosins regulate seed germination, the development of the host attachment organ, the haustorium, and several later stages of host-parasite integration. Here we discuss the signals regulating the development of the haustorium, the critical vegetative/parasitic transition in the life cycle of this obligate parasite. We provide evidence for the localized production of H2O2 at the Striga root tip andsuggest how this oxidant is used to exploit host peroxidases and cell wallpectins to generate a simple benzoquinone signal. This benzoquinone xenognosin proves to be both necessary and sufficient for haustorial induction incultured seedlings. Furthermore, evidence is provided that benzoquinone binding to a redox active site completes a "redox circuit" to mediate signal perception. This redox reaction regulates the time-dependent expression of specific marker genes critical for the development of the mature host attachment organ. These studies extend the emerging series of events necessary for the molecular regulation of organogenesis within the parasitic plants and suggest novel signaling features and molecular mechanisms that may be common across higher plants.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/01/20 alle ore 01:22:24