A G protein alpha null mutation confers prolificacy potential in maize

Area of Science:

• Plant Biology
• Molecular Genetics
• Developmental Biology

Background:

• Plant development exhibits plasticity, responding to environmental cues via complex signaling networks.
• The heterotrimeric G protein complex is a key regulator in various plant developmental pathways.

Purpose of the Study:

• To investigate the role of the G-protein alpha subunit in maize development.
• To quantitatively assess the impact of the compact plant 2 (ct2) mutation on root system architecture and female inflorescence formation.

Main Methods:

• Quantitative morphological assessment of root system architecture and female inflorescence in maize.
• Analysis of the ct2 mutant, which lacks the alpha subunit of the heterotrimeric G protein complex.

Main Results:

• The ct2 mutant showed altered shoot height and increased leaf number, indicating developmental compensation.
• A significant increase in the number of female inflorescences (ears) was observed in the ct2 mutant, even with pollination signals.
• The maize Gα subunit plays a crucial role in regulating the overproduction of female inflorescences.

Conclusions:

• The heterotrimeric G protein complex, particularly the Gα subunit, is vital for specific plastic developmental traits in maize.
• The maize Gα subunit functions to moderate the excessive development of female inflorescences.