Sorghum DW1 positively regulates brassinosteroid signaling by inhibiting the nuclear localization of BRASSINOSTEROID INSENSITIVE 2

Semi-dwarf traits have been widely introgressed into cereal crops to improve lodging resistance. In sorghum ( Sorghum bicolor L. Moench), four major unlinked dwarfing genes, Dw1-Dw4 , have been introduced to reduce plant height, and among them, Dw3 and Dw1 have been cloned. Dw3 encodes a gene involv...

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Bibliographic Details
Published in:Scientific reports 2017-03, Vol.7 (1), p.126-10, Article 126
Main Authors: Hirano, Ko, Kawamura, Mayuko, Araki-Nakamura, Satoko, Fujimoto, Haruka, Ohmae-Shinohara, Kozue, Yamaguchi, Miki, Fujii, Akihiro, Sasaki, Hiroaki, Kasuga, Shigemitsu, Sazuka, Takashi
Format: Article
Language:English
Subjects:
14/19
14/35
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631/449/1741/2670
631/449/711
Cereal crops
Deficient mutant
Gene regulation
Genes
Humanities and Social Sciences
Localization
Lodging
multidisciplinary
Oryza
Phenotypes
Plant breeding
Plant morphology
Rice
Science
Science (multidisciplinary)
Skotomorphogenesis
Sorghum
Wheat
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Summary:Semi-dwarf traits have been widely introgressed into cereal crops to improve lodging resistance. In sorghum ( Sorghum bicolor L. Moench), four major unlinked dwarfing genes, Dw1-Dw4 , have been introduced to reduce plant height, and among them, Dw3 and Dw1 have been cloned. Dw3 encodes a gene involved in auxin transport, whereas, Dw1 was recently isolated and identified as a gene encoding a protein of unknown function. In this study, we show that DW1 is a novel component of brassinosteroid (BR) signaling. Sorghum possessing the mutated allele of Dw1 ( dw1 ), showed similar phenotypes to rice BR-deficient mutants, such as reduced lamina joint bending, attenuated skotomorphogenesis, and insensitivity against feedback regulation of BR-related genes. Furthermore, DW1 interacted with a negative regulator of BR signaling, BRASSINOSTEROID INSENSITIVE 2 (BIN2), and inhibited its nuclear localization, indicating that DW1 positively regulates BR signaling by inhibiting the function of BIN2. In contrast to rice and wheat breeding which used gibberellin (GA) deficiency to reduce plant height, sorghum breeding modified auxin and BR signaling. This difference may result from GA deficiency in rice and wheat does not cause deleterious side effects on plant morphology, whereas in sorghum it leads to abnormal culm bending.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-017-00096-w