Convergent Loss of Awn in Two Cultivated Rice Species Oryza sativa and Oryza glaberrima Is Caused by Mutations in Different Loci.
G3 (Bethesda)
; 5(11): 2267-74, 2015 Sep 02.
Article
in En
| MEDLINE
| ID: mdl-26338659
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.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Oryza
/
Seeds
/
Genome, Plant
/
Evolution, Molecular
/
Genetic Loci
/
Mutation
Language:
En
Journal:
G3 (Bethesda)
Year:
2015
Document type:
Article
Affiliation country:
Japan