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2015 ; 47
(2
): 159-65
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Sequence and Spatiotemporal Expression Analysis of CLE-Motif Containing Genes
from the Reniform Nematode (Rotylenchulus reniformis Linford & Oliveira)
#MMPMID26170479
Wubben MJ
; Gavilano L
; Baum TJ
; Davis EL
J Nematol
2015[Jun]; 47
(2
): 159-65
PMID26170479
show ga
The reniform nematode, Rotylenchulus reniformis, is a sedentary
semi-endoparasitic species with a host range that encompasses more than 77 plant
families. Nematode effector proteins containing plant-ligand motifs similar to
CLAVATA3/ESR (CLE) peptides have been identified in the Heterodera, Globodera,
and Meloidogyne genera of sedentary endoparasites. Here, we describe the
isolation, sequence analysis, and spatiotemporal expression of three R.
reniformis genes encoding putative CLE motifs named Rr-cle-1, Rr-cle-2, and
Rr-cle-3. The Rr-cle cDNAs showed >98% identity with each other and the predicted
peptides were identical with the exception of a short stretch of residues at the
carboxy(C)-terminus of the variable domain (VD). Each RrCLE peptide possessed an
amino-terminal signal peptide for secretion and a single C-terminal CLE motif
that was most similar to Heterodera CLE motifs. Aligning the Rr-cle cDNAs with
their corresponding genomic sequences showed three exons with an intron
separating the signal peptide from the VD and a second intron separating the VD
from the CLE motif. An alignment of the RrCLE1 peptide with Heterodera glycines
and Heterodera schachtii CLE proteins revealed a high level of homology within
the VD region associated with regulating in planta trafficking of the processed
CLE peptide. Quantitative RT-PCR (qRT-PCR) showed similar expression profiles for
each Rr-cle transcript across the R. reniformis life-cycle with the greatest
transcript abundance being in sedentary parasitic female nematodes. In situ
hybridization showed specific Rr-cle expression within the dorsal esophageal
gland cell of sedentary parasitic females.