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, Jingyao Tang Joint International Research Laboratory of Metabolic and Developmental Sciences, State Key Laboratory of Hybrid Rice, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University , Shanghai 200240 , China Search for other works by this author on: Oxford Academic Xiaorong Huang State Key Laboratory of Hybrid Rice, College of Life Sciences, Wuhan University , Wuhan 430072 , China Search for other works by this author on: Oxford Academic Mengxiang Sun State Key Laboratory of Hybrid Rice, College of Life Sciences, Wuhan University , Wuhan 430072 , China Search for other works by this author on: Oxford Academic Wanqi Liang Joint International Research Laboratory of Metabolic and Developmental Sciences, State Key Laboratory of Hybrid Rice, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University , Shanghai 200240 , China Yazhou Bay Institute of Deepsea Sci-Tech, Shanghai Jiao Tong University , Sanya 572024 , China Author for correspondence: wqliang@sjtu.edu.cn Search for other works by this author on: Oxford Academic
https://orcid.org/0000-0002-8950-3709 Plant Physiology, kiae318, https://doi.org/10.1093/plphys/kiae318
Published:
21 June 2024
Article history
Received:
23 February 2024
Accepted:
10 May 2024
Corrected and typeset:
21 June 2024
Published:
21 June 2024
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Jingyao Tang, Xiaorong Huang, Mengxiang Sun, Wanqi Liang, DWARF TILLER1 regulates apical–basal pattern formation and proper orientation of rice embryos, Plant Physiology, 2024;, kiae318, https://doi.org/10.1093/plphys/kiae318
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Abstract
Body axis establishment is one of the earliest patterning events in plant embryogenesis. Asymmetric zygote division is critical for apical–basal axis formation in Arabidopsis (Arabidopsis thaliana). However, how the orientation of the cell division plane is regulated and its relation to apical–basal axis establishment and proper position of embryos in grasses remain poorly understood. By characterizing mutants of 3 rice (Oryza sativa) WUSCHEL HOMEOBOX9 (WOX9) genes, whose paralogs in Arabidopsis play essential roles in zygotic asymmetric cell division and cell fate determination, we found 2 kinds of independent embryonic defects: topsy-turvy embryos, in which apical–basal axis twists from being parallel to the longitudinal axis of the seed to being perpendicular; and organ-less embryos. In contrast to their Arabidopsis orthologs, OsWOX9s displayed dynamic distribution during embryo development. Both DWT1/OsWOX9A and DWL2/WOX9C play major roles in the apical–basal axis formation and initiation of stem cells. In addition, DWT1 has a distinct function in regulating the first few embryonic cell divisions to ensure the correct orientation of the embryo in the ovary. In summary, DWT1 acts in 2 steps during rice embryo pattern formation: the initial zygotic division, and with DWL2 to establish the main body axes and stem cell fate 2 to 3 d after pollination.
© The Author(s) 2024. Published by Oxford University Press on behalf of American Society of Plant Biologists. All rights reserved. For commercial re-use, please contact reprints@oup.com for reprints and translation rights for reprints. All other permissions can be obtained through our RightsLink service via the Permissions link on the article page on our site—for further information please contact journals.permissions@oup.com.
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