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.
Brassica oleracea L. (White Cabbage Group) · White cabbage
Syaak van der Ploeg
Brassica rapa L. var. rapa (L.) Thell. · Turnip
TAKII & CO LTD
Diospyros virginiana L. · American Persimmon
STANICA FLORINJERRY LEHMANMIHAI COSMIN ALEXANDRUTEODORESCU RAZVAN IONUT
Vicia ervilia (L.) Willd. · Bitter vetch
INIA/IFAPA(Salvador Nadal Moyano, Clara Isabel González Verdejo, Eva María Córdoba Jiménez)
Helianthus annuus L. · Sunflower
Tovarystvo z obmezhenoiu vidpovidalnistiu «IEvrosem»
Zea mays L. subsp. mays (Maize Group) · Maize
INSTITUT NATIONAL DE LA RECHERCHE AGRONOMIQUE, FR
Cucumis sativus L. · Cucumber
Yan Kulstra
Allium cepa L. var. cepa · Onion
Domaine Public (FR)
Brassica oleracea L. (Curly kale Group) · Curly kale
Enza Zaden Beheer B.V.
Cichorium intybus L. · Chicory
PUBBLICO DOMINIO
Solanum lycopersicum L. · Tomato
Syngenta Crop Protection AG
Lens culinaris Medik. · Lentil
AGROSERVICE SPA
Brassica oleracea L. (Cauliflower Group) · Cauliflower
Ton Loogman
Brassica oleracea L. (Cauliflower Group) · Cauliflower
Domaine Public (FR)
Zea mays L. subsp. mays (Maize Group) · Maize
INSTITUT NATIONAL DE LA RECHERCHE AGRONOMIQUE, FR
Cucumis sativus L. · Cucumber
Krylov Oleh Mykolaiovych, Borysov Oleksandr Volodymyrovych,
Zea mays L. · Maize
MONSANTO TECHNOLOGY
Zea mays L. · Maize
Brahin Oleksandr Mykolaiovych, Melnyk Ivan Ivanovych,
Festuca pratensis Huds. · Meadow fescue
BAYERISCHE PFLANZEN| Bayerische Pflanzenzucht- gesellschaft eG & Co KG
Zea mays L. · Maize
Eric Rayn
Zea mays L. subsp. mays (Maize Group) · Maize
C.S.I.C. (MADRID)
Lactuca sativa L. var. crispa L. · Leaf lettuce
Dydiv Ihor Volodymyrovych, Dydiv Ol`ha Iosypivna, Leschuk Nadiia Vasylivna, Pozniak Oleksandr Vasyl`ovych, Snityns`kyi Volodymyr Vasyl`ovych, Barabash Orest IUlianovych,
Zea mays L. · Maize
Vynohradova Oksana Mykolaivna, Dibrova Ivan IErofeievych, Blaschuk Mykhailo Ivanovych, Havryliuk Viktor Mykolaiovych, Larchenko Kateryna Andriivna, Morhun Volodymyr Vasylovych,
Beta vulgaris Garden Beet Group · Garden beet
Herrit Vlaar, Lipskyi Volodymyr Volodymyrovych,