Variety traits

Tolerance — Onion

Allium cepa L. var. cepa

The ability of onion varieties and hybrids to maintain productivity under abiotic stress and pathogen pressure, while minimizing physiological damage.

In the reference 44 varieties crop Onion, where this is mentioned in the description.

Tolerance in onions is assessed by comparing plant performance under stress conditions (drought, salinity, high temperature, waterlogging) with control plants. Genotypes with yield losses of less than 20% are considered highly tolerant, those with 20% to 40% are moderately tolerant, and those exceeding 40% are classified as sensitive.

Physiological markers such as membrane stability index, relative leaf water content, proline levels, and the activity of antioxidant enzymes (superoxide dismutase, catalase, peroxidase) are used for quantitative assessment. Morphometric indicators, including changes in plant height, bulb diameter, and biomass accumulation, are also utilized.

Tolerance directly affects yield stability in regions with risky climates and determines produce storability. Drought stress during the growing season often triggers premature maturation and incomplete neck curing, which negatively impacts bulb quality during storage.

General information about the subject — on the page Tolerance.

Sources8

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.