Variety traits

Tolerance — Onion

Allium cepa L.

The ability of onion varieties and hybrids to maintain productivity when exposed to pathogens, salinity, or moisture deficit. It is assessed through disease severity indices and morphophysiological stress resistance indicators.

In the reference 36 varieties crop Onion, where this is mentioned in the description.

The evaluation of onion tolerance to biotic factors is based on phytopathological methods that account for the degree of tissue damage and changes in bulb weight under infection by Fusarium, bacterial rot, or gray mold. In breeding practice, disease severity indices are used to assess the resistance of parental lines, where low scores in the 0.5–1.5 range indicate higher tolerance of the subject.

When exposed to abiotic stressors, such as salinity or water deficit, tolerance is determined using the stress tolerance index (STI), calculated based on morphological traits, including root system length and shoot biomass. Additionally, physiological markers are applied, such as the content of specific proteins, enzyme activity, and the intensity of mitotic cell division in bulb tissues.

General information about the subject — on the page Tolerance.

Sources6

Varieties of Onion mentioned in the description

Selection based on the description text, not on official evaluation: these data are absent from registers. For specific variety details, please refer to its profile.