Identification of An7 as a positive awn regulator from two wild rice species

The awn is a bristle-like appendage that protrudes from the seed tip and plays a critical role in preventing feed damage and spreading habitats in many grass species, including rice. While all wild species in the Oryza genus have awns, this trait has been eliminated in domesticated species due to it...

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Bibliographic Details
Published in:Breeding Science 2024, Vol.74(3), pp.247-258
Main Authors: Mizutani, Miya, Murase, Riri, Aoki, Shin-ichiro, Sato, Yutaka, Yamagata, Yoshiyuki, Yasui, Hideshi, Yoshimura, Atsushi, Ashikari, Motoyuki, Bessho-Uehara, Kanako
Format: Article
Language:English
Subjects:
An7
awn
Biosynthesis
brassinosteroid
Cultivation
Cytochrome P450
Cytochromes P450
Damage detection
Damage prevention
Enzymes
Genes
Grain cultivation
Grasses
Molecular modelling
Oryza barthii
Oryza glumaepatula
Oryza melidionalis
Oryza meridionalis
Oryza rufipogon
Quantitative trait loci
Research Paper
Rice
Species
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Summary:The awn is a bristle-like appendage that protrudes from the seed tip and plays a critical role in preventing feed damage and spreading habitats in many grass species, including rice. While all wild species in the Oryza genus have awns, this trait has been eliminated in domesticated species due to its obstructive nature to agricultural processes. To date, several genes involved in awn development have been identified in wild rice, Oryza rufipogon and Oryza barthii which are ancestral species of cultivated rice in Asia and Africa, respectively. However, the responsible genes for awn development have not been identified in other wild rice species even though multiple QTLs have been reported previously. In this study, we identified An7 gene responsible for awn development in two wild rice species, Oryza glumaepatula and Oryza meridionalis. An7 encodes a cytochrome P450 enzyme and is homologous to D2/CYP90D2, a known brassinosteroid biosynthesis enzyme in rice. The identification of An7 provides insight into a distinct molecular mechanism underlying awn development that occurs in geographically separated environments.
ISSN:1344-7610
1347-3735
DOI:10.1270/jsbbs.23052