Abnormal hypophyseal and suspensor divisions in Arabidopsis dcl1 embryos are not attributable to a single miR156-targeted SQUAMOSA PROMOTER BINDING PROTEIN-LIKE (SPL) gene, but likely involve redundant genetic pathways and/or modulation by genetic background.

ABSTRACT:

Key message

Loss of SPL10 and SPL11 increases penetrance of abnormal phenotypes in dcl1 embryos. The first division of the Arabidopsis zygote is asymmetric, resulting in an apical cell lineage that generates most of the embryo proper, and a basal cell lineage that produces the root meristem and the extraembryonic suspensor. Loss of function mutations in the microRNA processing enzyme genes DICER-LIKE 1 (DCL1) and SERRATE (SE) show cell division defects in the embryo proper, hypophyseal cell, and suspensor. Previous transcriptome analyses showed that the microRNA156-targeted transcription factor genes SQUAMOSA PROMOTER BINDING PROTEIN-LIKE2 (SPL2), SPL3 and SPL11 were upregulated in both globular stage dcl1 and se embryos, while SPL10 was upregulated in dcl1. It was previously propo

SUBMITTER: Tovar-Aguilar A 

PROVIDER: S-EPMC12507998 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature