Functional Characterization of Wheat TaAPC11-5B in Regulating Grain Size and Weight

Area of Science:

• Plant Biology
• Molecular Biology
• Genetics

Background:

• The anaphase-promoting complex/cyclosome (APC/C) is a crucial E3 ubiquitin ligase complex regulating cell cycle progression.
• APC/C activity is vital for modulating plant growth and development through the ubiquitination of cell cycle regulators.

Purpose of the Study:

• To functionally characterize the APC/C subunit TaAPC11-5B in wheat (Triticum aestivum).
• To investigate the role of TaAPC11-5B in regulating wheat grain development and yield potential.

Main Methods:

• Gene expression analysis of TaAPC11-5B in wheat grains.
• Biochemical assays to determine E3 ligase activity and protein interactions (TaAPC11-5B with TaAPC2).
• Heterologous overexpression of TaAPC11-5B in rice (Oryza sativa) to assess its effects on grain characteristics.

Main Results:

• TaAPC11-5B showed high expression in wheat grains at 25 days post-anthesis.
• TaAPC11-5B demonstrated intrinsic E3 ligase activity and interacted with TaAPC2.
• Overexpression of TaAPC11-5B in rice led to increased grain length, width, and weight, associated with enhanced cell division, expansion, and starch accumulation.

Conclusions:

• TaAPC11-5B acts as a key regulator of wheat grain size and weight.
• The findings highlight TaAPC11-5B's role in cellular processes (division, expansion) and starch metabolism.
• TaAPC11-5B presents a potential target for improving wheat yield through genetic strategies.