Immunoprofiling of Rice Root Cortex Reveals Two Cortical Subdomains

Area of Science:

• Plant biology
• Root development
• Cell biology

Background:

• Aerenchyma formation is crucial for flooding tolerance in plants.
• Cortical tissue development is vital for aerenchyma formation.
• Limited molecular tools hinder studies on root cortical development.

Purpose of the Study:

• To identify specific molecular markers for rice root cortical tissue.
• To differentiate between distinct cortical cell layers.
• To clarify cell identity in lateral roots.

Main Methods:

• Screening of a commercial cell wall antibody library.
• Immunostaining of rice root sections.
• Comparative analysis of root tissues.

Main Results:

• Eight out of 174 screened antibodies were specific to cortical tissue.
• Two distinct cortical cell layers, 'inner' and 'outer', were identified in rice root seedlings.
• The internal ground tissue of small lateral roots was confirmed to have outer cortical identity.

Conclusions:

• Novel cell wall antibodies serve as effective markers for rice root cortical tissues.
• The identification of inner and outer cortical layers provides new insights into root anatomy.
• These markers facilitate accurate cell identification in lateral roots, advancing studies on plant development and stress responses.