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Author Luo,S., Peng,J., Li,K., Wang,M. and Kuang,H.
Title Contrasting evolutionary patterns of the Rp1 resistance gene family in different species of poaceae
Abstract:
Disease-resistance genes (R-genes) in plants show complex evolutionary patterns. We investigated the evolution of the Rp1 R-gene family in Poaceae, and 409 Rp1 fragments were sequenced from 21 species. Our data showed that the common ancestor of Poaceae had two Rp1 loci, but the number of Rp1 locus in extant species varies from one to five. Some wheat and Zea genotypes have dozens of Rp1 homologues in striking contrast to one or two copies in Brachypodium distachyon. The large number of diverse Rp1 homologues in Zea was the result of duplications followed by extensive sequence exchanges among paralogues, and all genes in maize have evolved in a pattern of Type I R-genes. The high frequency of sequence exchanges did not cause concerted evolution in Zea species, but concerted evolution was obvious between Rp1 homologues from genera Zea and Sorghum. Differentiation of Type I and Type II Rp1 homologues was observed in Oryza species, likely occurred in their common ancestor. One member (Type II R-gene) in the Oryza Rp1 cluster did not change sequences with its paralogues, whereas the other paralogues (Type I R-genes) had frequent sequence exchanges. The functional Pi37 resistance gene in rice was generated through an unequal crossover between two neighboring paralogues followed by four point mutations. The Rp1 homologues in wheat and barley were most divergent, probably due to lack of sequence exchanges among them. Our results shed more light on R-gene evolution, particularly on the differentiation of Type I and Type II R-genes.
Journal Mol. Biol. Evol.
Country China
Volume 28(1)
Pages 313-325
Year 2011
PubMed ID 20713469
PubMed Central ID -
DOI 10.1093/molbev/msq216
URL -
Relation
Gene PI37
INSD GU733153 GU733154 GU733155 GU733156 GU733157 GU733158 GU733197 GU733198 GU733199 GU733200 GU733201 GU733202 GU733203 GU733204 GU733205 GU733206 GU733207 GU733208 GU733209 GU733210 GU733211 GU733212 GU733213 GU733214 GU733215 GU733216 GU733217 GU733218 GU733219 GU733220 GU733221 GU733222 GU733223 GU733224 GU733225 GU733226 GU733227 GU733228 GU733229 GU733230 GU733231 GU733232 GU733233 GU733234 GU733235 GU733236 GU733237 GU733238 GU733239 GU733240 GU733241 GU733242 GU733243 GU733244 GU733245 GU733316
Strain Wild Core Collection -
Induced Mutation Lines(NIG Collection) -
Sterile Seed Strain -
Lethal Embryo
Mutantion Strain
-
Stages in Each Organ
- Muant Lines (Gene)
-
Cultivated Varieties(NIG Collection) -
Stages in Each Organ -
/rice/oryzabase