An improved method for studying whole sections of late developing wheat grain.

Area of Science:

• Plant Science
• Histology
• Cereal Science

Background:

• Investigating in situ development of cell morphology and storage substances in cereal kernels requires high-quality histological sections.
• Existing methods may not adequately preserve cellular integrity for detailed analysis during critical grain filling stages.

Purpose of the Study:

• To develop an improved, simple method for obtaining good quality whole histological sections of wheat grains.
• To enable detailed in situ investigation of wheat grain development, including cell morphology, storage substance accumulation, and gene expression.

Main Methods:

• Wheat grains at mid- and late-stage grain filling (28 and 35 days post anthesis) were fixed and dehydrated.
• Grains were cleared in chloroform, infiltrated with paraffin at 55°C, embedded, and softened using diethyl pyrocarbonate (DEPC) water.
• Sections of 10–25 μm were obtained, preserving cellular structure and antigenicity.

Main Results:

• The improved method yields high-quality whole histological sections of wheat grains.
• The sections retained cellular structure and antigenicity, allowing for clear observation.
• In situ analysis of cell structure, distribution, autofluorescence, starch accumulation, and bam1 transcript localization was readily performed.

Conclusions:

• This method provides a reliable approach for studying wheat grain development at the cellular level.
• The technique facilitates in situ investigation of storage substance accumulation and gene expression during grain filling.
• The preserved antigenicity is crucial for subsequent molecular analyses in wheat histology.