期刊
DEVELOPMENT
卷 148, 期 24, 页码 -出版社
COMPANY BIOLOGISTS LTD
DOI: 10.1242/dev.199932
关键词
Flower development; Meristem; Ovule; Rice (Oryza sativa); Stem cell maintenance; TILLERS ABSENT 1 (TAB1)
资金
- Ministry of Education, Culture, Sports, Science and Technology of Japan [20H04880, 19K16160, 17H03745]
- Grants-in-Aid for Scientific Research [20H04880, 19K16160, 17H03745] Funding Source: KAKEN
In this study, the role of TAB1 in flower development was explored, revealing its essential function in ovule formation and maintenance of stem cell homeostasis in the flower meristem. Moreover, TAB1 likely promotes ovule formation by maintaining stem cells at a later stage of flower development.
Plant development depends on the activity of pluripotent stem cells in meristems, such as the shoot apical meristem and the flower meristem. In Arabidopsis thaliana, WUSCHEL (WUS) is essential for stem cell homeostasis in meristems and integument differentiation in ovule development. In rice (Oryza sativa), the WUS ortholog TILLERS ABSENT 1 (TAB1) promotes stem cell fate in axillary meristem development, but its function is unrelated to shoot apical meristem maintenance in vegetative development. In this study, we examined the role of TAB1 in flower development. The ovule, which originates directly from the flower meristem, failed to differentiate in tab1 mutants, suggesting that TAB1 is required for ovule formation. Expression of a stem cell marker was completely absent in the flower meristem at the ovule initiation stage, indicating that TAB1 is essential for stem cell maintenance in the 'final' flower meristem. The ovule defect in tab1 was partially rescued by floral organ number 2 mutation, which causes overproliferation of stem cells. Collectively, it is likely that TAB1 promotes ovule formation by maintaining stem cells at a later stage of flower development.
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