RRC ID 35786
Author Furuta T, Komeda N, Asano K, Uehara K, Gamuyao R, Angeles-Shim RB, Nagai K, Doi K, Wang DR, Yasui H, Yoshimura A, Wu J, McCouch SR, Ashikari M.
Title Convergent Loss of Awn in Two Cultivated Rice Species Oryza sativa and Oryza glaberrima Is Caused by Mutations in Different Loci.
Journal G3 (Bethesda)
Abstract A long awn is one of the distinct morphological features of wild rice species. This organ is thought to aid in seed dispersal and prevent predation by animals. Most cultivated varieties of Oryza sativa and Oryza glaberrima, however, have lost the ability to form long awns. The causal genetic factors responsible for the loss of awn in these two rice species remain largely unknown. Here, we evaluated three sets of chromosome segment substitution lines (CSSLs) in a common O. sativa genetic background (cv. Koshihikari) that harbor genomic fragments from Oryza nivara, Oryza rufipogon, and Oryza glaberrima donors. Phenotypic analyses of these libraries revealed the existence of three genes, Regulator of Awn Elongation 1 (RAE1), RAE2, and RAE3, involved in the loss of long awns in cultivated rice. Donor segments at two of these genes, RAE1 and RAE2, induced long awn formation in the CSSLs whereas an O. sativa segment at RAE3 induced long awn formation in O. glaberrima. These results suggest that the two cultivated rice species, O. sativa and O. glaberrima, have taken independent paths to become awnless.
Volume 5(11)
Pages 2267-74
Published 2015-9-2
DOI 10.1534/g3.115.020834
PII g3.115.020834
PMID 26338659
PMC PMC4632046
MeSH Evolution, Molecular* Genetic Loci* Genome, Plant* Mutation* Oryza / genetics* Seeds / genetics*
IF 2.63
Times Cited 13
Rice W0054 W0106