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.
Zea mays L. · Maize
Zhan Beibeder
Zea mays L. subsp. mays (Maize Group) · Maize
R 2n (FR)
Zea mays L. · Maize
MAS SEEDS
Zea mays L. subsp. mays (Maize Group) · Maize
Limagrain Europe s.a.
Solanum lycopersicum L. · Tomato
isi Sementi s.p.a. Frazione (IT)
Zea mays L. subsp. mays (Maize Group) · Maize
Cucurbita pepo L. · Field pumpkin
Sakata Vegetables Europe S.A.S
Capsicum annuum L. · Bell pepper
TAKII EUROPE B V
Beta vulgaris Sugar Beet Group · Sugar beet
D.J.VAN DER HAVE
Zea mays L. · Maize
SYNGENTA ITALIA S.P.A.
Lactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Zea mays L. · Maize
Halechko Ivan Dmytrovych, Borysov Viktor Mykolaiovych,
Zea mays L. subsp. mays (Maize Group) · Maize
GIE Sockalb (FR)
Brassica oleracea L. (White Cabbage Group) · White cabbage
Domaine Public (FR)
Cichorium endivia L. · Endive
Domaine Public (FR)
Cichorium endivia L. · Endive
Royal Sluis (NL)
Cucumis sativus L. · Cucumber
ENZA ZADEN B.V.
Zea mays L. · Maize
MAIS ANGEVIN HODEE
Glycine max (L.) Merr. · Soybean
ALAIN LETOURNEAU
Zea mays L. · Maize
Tereschuk Serhii Mykolaiovych, Kalynchuk Oleh Ivanovych, Chernobai Larysa Mykolaivna, Ivlieva Tetiana Volodymyrivna, Barsukov Ihor Petrovych, Kamyshan Taisiia Petrivna, Chupikov Mykola Mykhailovych, Kozubenko Leonid Vasyl`ovych,
Citrus sinensis (L.) Osbeck · Sweet orange
Brassica oleracea L. (Curly kale Group) · Curly kale
Syngenta Seeds B.V.
Hordeum vulgare L. · Barley
Apsovsementi S.p.A., CREA-GB
Lactuca sativa L. · Lettuce
Domaine Public (FR)