A single cell-wall protein controls the first steps of plant embryo development
Luo A, Qiao Y, Li S, Wang X, Shi C
Plant Signaling
Seed germination rates and embryo viability in crops and garden plants depend on molecular signals most breeders can't yet see or manipulate, and this discovery opens a window into why some seeds abort even under ideal conditions.
Every plant starts life as a single fertilized cell that must divide in precise, organized ways to become a seedling. Researchers found a protein that sits in the cell wall of tobacco embryos right after fertilization and acts like a traffic controller, making sure those early divisions happen correctly. When they disabled this protein using gene-editing tools, the embryo's cells grew lopsided and stopped developing, and the seeds died.
Key Findings
The extracellular protein NtProRP1 localizes to the cell wall immediately after fertilization and is required for normal embryo cell division patterns in tobacco.
CRISPR-Cas9 knockout of NtProRP1 caused arrested embryos with irregular cell shapes and aborted seeds, demonstrating an essential developmental role.
Transcriptome profiling of isolated two-celled proembryos showed coordinated upregulation of genes for cellulose, hemicellulose, and pectin synthesis in mutants, implicating cell wall integrity signaling pathways including receptor-like kinases, MAPKs, Ca2+ flux, and phytohormones.
chevron_right Technical Summary
Scientists discovered a cell-wall protein in tobacco plants that acts as a molecular gatekeeper during the first cell divisions of a new embryo. Without it, embryos develop irregular shapes and die, revealing that the space outside plant cells plays a far more active role in early development than previously understood.
Abstract Preview
Original paper
The extracellular regulatory network and key factors governing early embryogenesis in Nicotiana tabacum.
The plant extracellular space, including the cell wall, is a dynamic signaling compartment outside the plasma membrane that plays crucial roles in cell-cell communication and developmental coordina...
open_in_new Read full abstractAbstract copyright held by the original publisher.
Species Mentioned
Was this useful?
Want to tell us more? (optional)
Thanks for the note!
Something went wrong — please try again.
Too many submissions. Try again in an hour.
Gene editing removes 97% of celiac-triggering proteins from bread wheat
It could mean that people with celiac disease — roughly 1 in 100 worldwide — may one day safely eat bread made from real wheat, without sacrificing the taste...
Tobacco is the common name of several plants in the genus Nicotiana of the family Solanaceae, and the general term for any product prepared from the cured leaves of these plants. Seventy-nine species of tobacco are known, but the chief commercial crop is N. tabacum. The more potent variant N. rus...