An efficient virus-induced gene silencing vector for maize functional genomics research

Area of Science:

• Plant molecular biology
• Genetics
• Agricultural science

Background:

• Maize genetic diversity is valuable for research.
• Lack of rapid gene function analysis tools in maize hinders progress.
• Existing methods like stable transformation are time-consuming.

Purpose of the Study:

• To develop an efficient virus-induced gene silencing (VIGS) vector for maize.
• To enable rapid transient gene function analysis across various maize cultivars.
• To overcome limitations of traditional time-consuming genetic studies.

Main Methods:

• Construction of an infectious clone of a naturally maize-infecting cucumber mosaic virus (CMV) strain, ZMBJ-CMV.
• Optimization of an Agrobacterium-mediated vascular puncture inoculation method for maize.
• Modification of ZMBJ-CMV to create a functional VIGS vector for gene silencing.

Main Results:

• The ZMBJ-CMV VIGS vector induced mild to moderate symptoms in many maize lines, including B73.
• Silencing of endogenous genes ZmPDS and ZmIspH resulted in significant expression decrease (75% and 78%).
• Optimal insert length for silencing was 100-300 bp, and autophagy genes (ZmATG3, ZmATG8a) were successfully silenced, revealing roles in leaf starch degradation.

Conclusions:

• The developed ZMBJ-CMV VIGS vector is effective for rapid gene function studies in maize.
• This tool is applicable to a wide range of maize cultivars, including important ones like B73.
• The VIGS system facilitates understanding of gene functions, such as those involved in autophagy and starch metabolism.