Abstract：
:Since the discovery of double fertilization, it has been recognized that flowering plants produce two highly dimorphic female gametes, the egg cell and central cell. These give rise, respectively, to the embryo and the endosperm, a nourishing tissue unique to flowering plants. Here we show that in Arabidopsis, endosperm formation requires the CYTOKININ INDEPENDENT 1 (CKI1) histidine kinase, an activator of the cytokinin signaling pathway, which specifies central cells and restricts egg cell fate. Dimorphism of the two adjacent gametes is mechanistically established in the syncytial embryo sac by spatially restricted CKI1 expression, followed by translocation of ER-localized CKI1 protein via nuclear migration. Cell specification by CKI1 likely involves activation of the cytokinin signaling pathway mediated by histidine phosphotransferases. Ectopic CKI1 expression generates non-propagating seeds with dual fertilized endosperms and no embryos. We conclude that CKI1-directed specification of the endosperm precursor central cell results in seeds containing an embryo and an endosperm.
journal_name
Dev Celljournal_title
Developmental cellauthors
Yuan L,Liu Z,Song X,Johnson C,Yu X,Sundaresan Vdoi
10.1016/j.devcel.2016.03.009subject
Has Abstractpub_date
2016-04-04 00:00:00pages
34-46issue
1eissn
1534-5807issn
1878-1551pii
S1534-5807(16)30117-4journal_volume
37pub_type
杂志文章abstract：:Epithelial-mesenchymal transition (EMT) enables cells to gain migratory and invasive features underlined by major transcriptional and epigenetic reprogramming. However, most studies have focused on the endpoints of the EMT process, and the epistatic hierarchy of the transcriptional networks underlying EMT has remained...
journal_title：Developmental cell
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journal_title：Developmental cell
pub_type： 杂志文章,评审
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journal_title：Developmental cell
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journal_title：Developmental cell
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journal_title：Developmental cell
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pub_type： 评论,杂志文章
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journal_title：Developmental cell
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doi：10.1016/j.devcel.2009.12.013
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journal_title：Developmental cell
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