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Related Experiment Video

Updated: Aug 3, 2025

Experimental Design for Laser Microdissection RNA-Seq: Lessons from an Analysis of Maize Leaf Development

Experimental Design for Laser Microdissection RNA-Seq: Lessons from an Analysis of Maize Leaf Development

Published on: March 5, 2017

ZmGI2 regulates flowering time through multiple flower development pathways in maize.

Zhimin Li¹, Fengran Gao¹, Yajing Liu¹

¹College of Agronomy, National Key Laboratory of Wheat and Maize Crop Science and Key Laboratory of Regulating and Controlling Crop Growth and Development Ministry of Education, Henan Agricultural University, No. 15 Longzihu University Park, Zhengdong New Area, Zhengzhou, Henan 450046, China.

Plant Science : an International Journal of Experimental Plant Biology

|April 8, 2023

Summary

The GIGANTEA (GI) gene in maize (Zea mays) regulates flowering time by influencing the photoperiodic pathway. ZmGI2 delays flowering, particularly under long days, by controlling key flowering genes.

Keywords:

Circadian clock Floral transition Flower development Photoperiod Zea mays ZmGI2

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Lignin Down-regulation of Zea mays via dsRNAi and Klason Lignin Analysis

Lignin Down-regulation of Zea mays via dsRNAi and Klason Lignin Analysis

Published on: July 23, 2014

Area of Science:

Plant biology
Molecular genetics
Circadian rhythms

Background:

GIGANTEA (GI) is a key component of the circadian clock in model plants, regulating photoperiodic flowering.
The specific role of GI in maize flowering time and photoperiodism remains largely uncharacterized.

Purpose of the Study:

To elucidate the function of the GIGANTEA (GI) gene in regulating flowering time in maize.
To investigate the molecular mechanisms by which ZmGI2 influences the photoperiodic flowering pathway in maize.

Main Methods:

Analysis of the zmgi2 mutant for flowering time differences under long day (LD) and short day (SD) conditions.
Gene expression profiling of ZmGI2 in stem apex meristems (SAM) over a 24-hour period under LD and SD.
DAP-Seq and RNA-Seq to identify direct targets and regulatory interactions of ZmGI2.

Main Results:

The zmgi2 mutant exhibited earlier flowering under LD conditions compared to wild type, with no significant difference under SD.
ZmGI2 expression peaked at specific times after dawn in SAM under both LD and SD, suggesting temporal regulation.
ZmGI2 directly represses flowering activators (ZmVOZs, ZmZCN8, ZmFPF1) and promotes flowering repressors (ZmARR11, ZmDOF, ZmUBC11) via upstream binding.

Conclusions:

ZmGI2 plays a crucial role in delaying flowering in maize, primarily under long-day conditions, by modulating the photoperiodic pathway.
This study reveals novel insights into the function of GI transcription factors in maize and their importance for floral transition.
The findings contribute to understanding the molecular mechanisms and regulatory networks governing flowering time in maize.