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G3 (Bethesda). 2015 Sep 2;5(11):2267-74. doi: 10.1534/g3.115.020834.

Convergent Loss of Awn in Two Cultivated Rice Species Oryza sativa and Oryza glaberrima Is Caused by Mutations in Different Loci.

Author information

1
Bioscience and Biotechnology Center, Nagoya University, Furo-cho, Chikusa, Nagoya, Aichi 464-8601, Japan.
2
Department of Plant Breeding and Genetics, Cornell University, Ithaca, New York 14853-1901.
3
Plant Breeding Laboratory, Kyushu University, Higashi-ku, Fukuoka 812-8581, Japan.
4
National Institute of Agrobiological Sciences, Tsukuba, Ibaraki 305-8634, Japan.
5
Department of Plant Breeding and Genetics, Cornell University, Ithaca, New York 14853-1901 srm4@cornell.edu ashi@agr.nagoya-u.ac.jp.
6
Bioscience and Biotechnology Center, Nagoya University, Furo-cho, Chikusa, Nagoya, Aichi 464-8601, Japan srm4@cornell.edu ashi@agr.nagoya-u.ac.jp.

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.

KEYWORDS:

African rice; Asian rice; CSSLs; awn; domestication

PMID:
26338659
PMCID:
PMC4632046
DOI:
10.1534/g3.115.020834
[Indexed for MEDLINE]
Free PMC Article

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