High and low throughput screens with root-knot nematodes Meloidogyne spp

Area of Science:

• Plant Pathology
• Nematology
• Agricultural Science

Background:

• Root-knot nematodes (Meloidogyne spp.) are major plant pathogens causing significant economic losses.
• The infective stage is the second-stage juvenile (J2), which penetrates plant roots to establish a feeding site.
• Infection leads to characteristic root galls, impacting plant growth and yield.

Purpose of the Study:

• To present a traditional protocol for plant infection with root-knot nematodes.
• To introduce two novel high-throughput assays for efficient nematode screening.
• To enable post-phenotyping use of plants for breeding.

Main Methods:

• Traditional method: Plants grown in pots infected with nematodes.
• High-throughput assay 1: Seedlings of small-seeded plants (e.g., tomato) grown in sand trays.
• High-throughput assay 2: Seedlings of large-seeded plants (e.g., cowpea, common bean) grown in soil-free seedling growth pouches.

Main Results:

• The seedling growth pouches allow direct observation of nematode infection, galling, and egg masses.
• Both high-throughput methods are suitable for screening and subsequent use in crossing or seed production.
• The soil-free pouch method offers space efficiency for large-scale assays.

Conclusions:

• Developed high-throughput assays streamline root-knot nematode infection and phenotyping.
• These methods support efficient screening of plant resistance and breeding programs.
• The seedling growth pouch assay is particularly advantageous for large-scale studies due to its space efficiency and observational clarity.