Surface signaling in pathogenesis.

Abstract

ABSTRACT

Regulation of Constitutively Expressed and Induced Cutinase Genes by Different Zinc Finger Transcription Factors inFusarium solani f. sp. pisi(Nectria haematococca)

“…CTF1␣ promoter does contain an element that binds a transcription factor that has been cloned. 3 We postulate that cutin monomer-dependent phosphorylation that has been detected previously (1,16) is involved in the transcriptional activation of ctf1␣ gene, possibly by direct phosphorylation of the transcription factor that binds ctf1␣ promoter, although we do not have direct evidence for this hypothesis (indicated by the dotted lines and lowercase letters in Fig. 9).…”

“…Fungal infection of plants can be assisted by extracellular cutinases that help the pathogen penetrate through the outermost cuticular barrier of the host (1,2). Conidia of highly virulent pathogens, which can directly penetrate through the cuticle, have low levels of cutinase that release small amounts of cutin monomers when the conidia contact the host surface (3).…”

“…Palindrome 2 was found to be necessary for the inducible cutinase gene expression (5). A protein that binds the palindromic region, called palindrome binding protein (PBP), 1 (6) and a cutinase transcription factor 1␣ (CTF1␣), which selectively binds palindrome 2 and transactivates the cutinase promoter (7), have been cloned. CTF1␣, a 101-kDa protein, contains a Cys 6 Zn 2 binuclear cluster motif, sharing homology to the Cys 6 Zn 2 binuclear cluster DNA-binding domains of transcription factors from yeast and filamentous fungi.…”

The plant hormone indoleacetic acid induces invasive growth in Saccharomyces cerevisiae

“…Fungi alight on a plant in a cellular form either as a yeast cell or spore and, after sensing the plant, proliferate into an invasive filamentous form. For example, spores of Colletotrichum gloeosporioides elaborate an invasion structure (appressorium) in response to ethylene, a plant hormone that promotes fruit ripening (2). By homing in on the plant hormone, the fungus synchronizes its invasion with a nutritionally advantageous stage in plant development.…”

Estudo molecular do desenvolvimento de <i>Puccinia psidii</i> Winter <i>in vitro</i> e no processo de infecção em<i> Eucalyptus grandis</i>

“…A superfície das plantas é coberta pela membrana cuticular composta por uma matriz de polímero (cutina) associada a lipídeos, conhecidos por cutícula ou ceras cuticulares SCHÄVER;RIEDERER, 2000). Quando os uredósporos se instalam sobre as plantas, se deparam primeiramente com essa camada de cera sobre a superfície foliar, conhecida como epicutícula (KOLATTUKUDY et al, 1995).…”