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The apocarotenoid metabolite zaxinone regulates growth and strigolactone biosynthesis in rice

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  3. 2019

The apocarotenoid metabolite zaxinone regulates growth and strigolactone biosynthesis in rice

by Jian You Wang, Imran Haider, Muhammad Jamil, Valentina Fiorilli, Yoshimoto Saito, Jianing Mi, Lina Baz, Boubacar A Kountche, Kun-Peng Jia, Xiujie Guo, Aparna Balakrishna, Valentine O Ntui, Beate Reinke, Veronica Volpe, Takashi Gojobori, Ikram Blilou, Luisa Lanfranco, Paola Bonfante, Salim Al-Babili
Scientific Year: 2019 DOI: 10.1038/s41467-019-08461-1

Extra Information

Nature communications, 10 (1), 810

Abstract

Carotenoid cleavage dioxygenases (CCDs) form hormones and signaling molecules. Here we show that a member of an overlooked plant CCD subfamily from rice, that we name Zaxinone Synthase (ZAS), can produce zaxinone, a novel apocarotenoid metabolite in vitro. Loss-of-function mutants (zas) contain less zaxinone, exhibit retarded growth and showed elevated levels of strigolactones (SLs), a hormone that determines plant architecture, mediates mycorrhization and facilitates infestation by root parasitic weeds, such as Striga spp. Application of zaxinone can rescue zas phenotypes, decrease SL content and release and promote root growth in wild-type seedlings. In conclusion, we show that zaxinone is a key regulator of rice development and biotic interactions and has potential for increasing crop growth and combating Striga, a severe threat to global food security.

Keywords

apocarotenoid zaxinone strigolactone rice
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