Variety traits
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.
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.
Cucumis sativus L. · Cucumber
KLIMENKO NIKOLAJ NIKOLAEVICh / MAKSIMOV SERGEJ VASIL'EVICh / BAKLANOVA OL'GA VLADIMIROVNA / ChISTYaKOVA LYuBOV' ALEKSANDROVNA
Valerianella locusta (L.) Laterr. · Corn salad
Clause Semences SA (FR)
Zea mays L. · Maize
PIONEER| Pioneer Hi-Bred Services GmbH
Brassica oleracea L. (Broccoli Group) · Broccoli
A.L. Tozer Ltd (GB)
Brassica oleracea L. (Curly kale Group) · Curly kale
BEJO ZADEN
Onobrychis viciifolia Scop. · Common sainfoin
SEM SELECT D-L
Brassica oleracea L. (Broccoli Group) · Broccoli
Sakata Seed Corporation, Tsuzuku-Ku, Yokohama 224
Cucumis sativus L. · Cucumber
Selekcijos ir sėklininkystės firma ,,Manul"
Phaseolus coccineus L. · Runner bean
A L TOZER LTD
Glycine max (L.) Merr. · Soybean
RAC Station federale de recherches agronomiques de Changins (CH)/Orsem SA (FR)
Spinacia oleracea L. · Spinach
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Zea mays L. · Maize
Syngenta Seeds
Cicer arietinum L. · Chickpea
ITACYL (CASTILLA Y LEON)
Trifolium alexandrinum L. · Egyptian clover
D'EUGENIO SEMENTI
Oryza sativa L. · Rice
LUGANO LEONARDO SRL
Cynodon dactylon (L.) Pers. · Bermuda grass
SEEDS WEST
Cucumis melo L. · Melon
BURPEE NL B.V.
Trifolium alexandrinum L. · Egyptian clover
CAPPAGLI LUIGI
Festuca ovina L. · Sheep's fescue
Lietuvos agrarinių ir miškų mokslų centras
Cucurbita pepo L. · Field pumpkin
Seminis Vegetable Seeds
Brassica oleracea L. (Curly kale Group) · Curly kale
Pieterpik B.V.
Oryza sativa L. · Rice
Trakiy Agricultural Research Institute (TR)
Cucumis sativus L. · Cucumber
Monsanto Vegetable IP Management B.V (NL)
Zea mays L. · Maize
OOO «ROST AGRO» GU "INSTITUT ZERNOVYX KULTUR NACZIONALNOJ AKADEMII AGRARNYX NAUK UKRAINY"