Two pattern recognition receptors provide quantitative resistance to Gray Leaf Spot in Maize

Area of Science:

• Plant Pathology
• Genetics
• Crop Science

Background:

• Gray Leaf Spot (GLS), caused by Cercospora zeae-maydis and Cercospora zeina, is a major economically significant foliar disease impacting global maize (Zea mays L.) production.
• Current GLS management relies on genetic resistance, field practices, and fungicide applications, which involve costs and specific timing.
• Developing genetic solutions for GLS resistance is a key objective for sustainable maize farming.

Purpose of the Study:

• To discover, map, and clone novel genes conferring resistance to Gray Leaf Spot in maize.
• To validate the function of these identified resistance genes through transgenic approaches.
• To explore the potential of these genes for deployment in commercial maize hybrids.

Main Methods:

• Fine mapping and positional cloning were employed to identify candidate resistance genes.
• Transgenic validation was conducted to confirm the function of the cloned genes.
• The study focused on genes exhibiting dominant effects for resistance to Cercospora zeae-maydis.

Main Results:

• Two novel genes, designated Rcz1 and Rcz2, with dominant effects conferring resistance to Cercospora zeae-maydis were discovered, mapped, and cloned.
• Transgenic validation confirmed the role of Rcz1 and Rcz2 in providing resistance to GLS.
• These genes represent significant genetic resources for enhancing maize resistance to Gray Leaf Spot.

Conclusions:

• The identification and validation of Rcz1 and Rcz2 offer a powerful genetic tool for combating Gray Leaf Spot in maize.
• Incorporating these dominant resistance genes into commercial maize hybrids can lead to reduced yield losses.
• This genetic solution has the potential to benefit maize production across multiple global markets.