AI Article Synopsis
- Plant vascular tissues are vital for land plants, but how vascular cell differentiation starts remains unclear.
- The study identifies LONESOME HIGHWAY (LHW), a transcription factor, as essential for proper cell division in generating vascular initial cells during the embryo stage.
- LHW influences the expression of auxin-related components, indicating its role as a key regulator in the differentiation of vascular cells associated with auxin signaling.
Article Abstract
Plant vascular tissues are essential for the existence of land plants. Many studies of transcriptional regulation and cell-cell communication have revealed the process underlying the development of vascular tissues from vascular initial cells. However, the initiation of vascular cell differentiation is still a mystery. Here, we report that LONESOME HIGHWAY (LHW), which encodes a bHLH transcription factor, is expressed in pericycle-vascular mother cells at the globular embryo stage and is required for proper asymmetric cell division to generate vascular initial cells. In addition, ectopic expression of LHW elicits an ectopic auxin response. Moreover, LHW is required for the correct expression patterns of components related to auxin flow, such as PIN-FORMED 1 (PIN1), MONOPTEROS (MP) and ATHB-8, and ATHB-8 partially rescues the vascular defects of lhw. These results suggest that LHW functions as a key regulator to initiate vascular cell differentiation in association with auxin regulation.
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| http://dx.doi.org/10.1242/dev.087924 | DOI Listing |
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