Fusarium wilt constrains mungbean yield due to reduction in source availability

Area of Science:

• Agricultural Science
• Plant Pathology
• Genetics

Background:

• Mungbean is a vital protein source and export crop, but susceptible to biotic stresses.
• Fusarium oxysporum causes Fusarium wilt, leading to significant yield losses in mungbean.
• Understanding genetic variation is crucial for developing resilient mungbean cultivars.

Purpose of the Study:

• To assess the impact of Fusarium wilt on mungbean development and yield.
• To identify mungbean genotypes tolerant to Fusarium oxysporum.
• To determine key traits associated with yield under disease and disease-free conditions.

Main Methods:

• Field trials of 23 diverse mungbean accessions under rainfed conditions in 2016 and 2021.
• Evaluation of phenology, canopy, and yield component traits under Fusarium wilt and disease-free conditions.
• Analysis of genetic variation and trait performance across environments.

Main Results:

• Significant genetic variation observed for all evaluated traits.
• Aboveground biomass at 50% flowering significantly drives yield, with Fusarium reducing it by up to 96%.
• Eight mungbean genotypes demonstrated tolerance to Fusarium wilt, exhibiting diverse phenological and morphological traits.

Conclusions:

• Fusarium wilt severely impacts mungbean yield, primarily through effects on biomass accumulation.
• Tolerant mungbean genotypes possess varied traits, providing options for breeding programs.
• Identification of tolerant lines can be leveraged for developing Fusarium-resistant mungbean varieties.