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Variety traits

Cold tolerance

Cold tolerance is a biological characteristic of a variety that determines its ability to develop and maintain productivity under prolonged exposure to low positive temperatures (from +1 to +10 °C).

Mentioned in descriptions 2 844 varieties reference book.

Cold tolerance represents the ability of an organism to maintain normal metabolism, protoplasm structure, and enzymatic activity under conditions where thermophilic crops begin to slow growth, yellow, and lose turgor. Unlike winter hardiness, this indicator does not imply the tolerance of sub-zero temperatures and freezing of tissues. In practice, a cold-tolerant variety allows for early sowing in unheated soil, reduces the risk of seedling death during spring cold snaps, contributes to the efficient use of winter moisture, and accelerates development, which often leads to earlier maturity.

Field and laboratory evaluation methods are used during variety testing. The field methodology includes phenological observations of growth rates during early sowing, visual assessment of survival after temperature stress, and structural analysis of the impact of conditions on yield components. In laboratory settings, a 'cold test' is used for seed germination in incubators at reduced temperatures followed by further growth, as well as biochemical analysis, such as determining the level of free proline in leaves.

Cold tolerance is expressed through a coefficient calculated as the ratio of performance in stress conditions to control conditions, or through percentage values of germination. Based on these data, varieties are divided into groups by resistance level. An important indicator is the temperature minimum at which crop growth ceases, which is about +4 °C for most plants and up to +10 °C for maize. Variety selection requires consideration of the biological characteristics of the crop, as this trait is critical for thermophilic plants at the early development stage.

Sources10

Breakdown by crop

Cold tolerance of maize 73 Cold tolerance of lettuce 19 Cold tolerance — soybean 15 Cold tolerance of maize 13 Cold tolerance of pea 11 Cold tolerance of endive 10 Cold tolerance of chicory 9 Cold tolerance of cucumber 9 Tomato cold tolerance 9 Cold tolerance of parsley 8 Cold tolerance of sunflower 8 Cold tolerance of spinach 7 Cold tolerance of turnip 7 Cold tolerance — Leek 7 Cold tolerance of carrots 7 Cold tolerance — soft wheat 7 Cold Hardiness of Savoy Cabbage 6 Cold tolerance — white cabbage 6 Cold tolerance — fava bean 5 Cold tolerance of faba beans 5 Cold tolerance — Black radish 5 Cold resistance of radish 5 Cold tolerance of Anthurium andraeanum 5 Cold tolerance of rice 5

Found in these crops

Maize 261 Maize 75 Olive 51 Anthurium 35 Lettuce 27 Sunflower 27 Tomato 24 Cucumber 24 Soybean 21 Leek 17 Chicory 15 Cauliflower 15

Varieties that feature this in their description

Selection based on the description text, not official resistance ratings: such data is not available in registers. Mention indicates that the trait is discussed in the variety's sources; see the variety's profile for details on what is specifically stated.

Beauregard

Active

Lactuca sativa L. · Lettuce

IT
2 records

Dash

Active

Spinacia oleracea L. · Spinach

NL
2 records

CLEMENULES

Active

Citrus clementina hort. ex Tanaka · Clementine

ES
4 records

Balder

Active

Solanum melongena L. · Eggplant

RO
2 records

Cristal

Terminated

Apium graveolens L. var. dulce (Mill.) Pers. · Celery

NL
2 records

Brava

Terminated

Raphanus sativus L. var. sativus · Radish

NL
2 records

Beton

Active

Cucurbita maxima Duchesne x Cucurbita moschata Duchesne

CZ
2 records

Azman

Terminated

Cucurbita maxima Duchesne x Cucurbita moschata Duchesne

NL
2 records

Arikan

Active

Capsicum annuum L. · Bell pepper

HU
2 records

Alina

Active

Raphanus sativus L. var. sativus · Radish

RO
2 records

FLAME

Active

Citrus x paradisi Macfad. · Grapefruit

3 records

Cenor

Terminated

Zea mays L. subsp. mays (Maize Group) · Maize

CZ
2 records

Celio 250

Active

Zea mays L. subsp. mays (Maize Group) · Maize

CZ
3 records

DKC3247

Active

Zea mays L. · Maize

UA
3 records

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