A 3-component module maintains sepal flatness in Arabidopsis

Xu, Shouling; He, Xi; Trinh, Duy-Chi; Zhang, Xinyu; Wu, Xiaojiang; Qiu, Dengying; Zhou, Ming; Xiang, Dan; Roeder, Adrienne H.K.; Hamant, Olivier; Hong, Lilan

doi:10.1016/j.cub.2024.07.066

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Highly expressed cell wall genes contribute to robustness of sepal size

Hartasánchez,

Dumond,

Dubrulle

et al. 2024

Preprint

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Reproducibility in organ size and shape is a fascinating trait of living organisms. The mechanisms underlying such robustness remain, however, to be elucidated. Taking the sepal of Arabidopsis as a model, we investigated whether variability of gene expression plays a role in variation of organ morphology. Previous work from our team identified cell-wall related genes as being enriched among the genes whose expression is highly variable. We then hypothesized that the variation of measured morphological parameters in cell-wall related single knockout mutants could be correlated with the variation in gene expression of the corresponding gene (the knocked-out gene) in wild-type plants. We analyzed sepal morphology from 16 cell-wall mutants and found that, unexpectedly, the higher a gene is expressed in wild type, the more variable the size of the corresponding mutant. These findings support a contribution of cell-wall related genes to the robustness of sepal size.

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