An elastic proteinaceous envelope encapsulates the early Arabidopsis embryo.

ABSTRACT: Plant external surfaces are often covered by barriers that control the exchange of molecules, protect from pathogens and offer mechanical integrity. A key question is when and how such surface barriers are generated. Post-embryonic surfaces have well-studied barriers, including the cuticle, and it has been previously shown that the late Arabidopsis thaliana embryo is protected by an endosperm-derived sheath deposited onto a primordial cuticle. Here, we show that both cuticle and sheath are preceded by another structure during the earliest stages of embryogenesis. This structure, which we named the embryonic envelope, is tightly wrapped around the embryonic surface but can be physically detached by cell wall digestion. We show that this structure is composed primarily of extensin and arabin

SUBMITTER: Harnvanichvech Y 

PROVIDER: S-EPMC10651100 | biostudies-literature | 2023 Nov

REPOSITORIES: biostudies-literature