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
Osadchyi Serhii Stepanovych, Khromenko Vitalii Oleksandrovych, Kalinchuk Oleh Ivanovych, Tereshcuk Serhii Mykolaiovych, Fedko Mykola Mykolaiovych, Cherchel Vladyslav IUriiovych, Dziubetskyi Borys Volodymyrovych,
Brassica oleracea L. (Cauliflower Group) · Cauliflower
Syngenta Seeds B.V.
Cucumis sativus L. · Cucumber
Panova Mariia Dmytrivna, Krylov Oleh Mykolaiovych, Borysov Oleksandr Volodymyrovych,
Daucus carota L. · Carrot
Eike Kampe, Lipskyi Volodymyr Volodymyrovych,
Helianthus annuus L. · Sunflower
SYNGENTA SEEDS AG, CH
Zea mays L. · Maize
Syngenta Seeds
Cynodon dactylon (L.) Pers. · Bermuda grass
Technology Development Center - Oklahoma State University
Avena sativa L. · Oat
ETS.C.C.BENOIST
Zea mays L. · Maize
Stots`kyi Viktor Pavlovych
Brassica napus L. subsp. napus var. pabularia (DC.) Alef. · Hanover-salad
AntonioDe Haro Bailón/Sara Obregón Cano/ ElenaCartea Gonzalez/Pilar Soengas Fernández
Zea mays L. · Maize
Chernobai Larysa Mykolaivna, Ivleva Tetiana Volodymyrivna, Barsukov Ihor Petrovych, Kamyshan Taisiia Petrivna, Chupikov Mykola Mykhailovych, Kozubenko Leonid Vasyl`ovych,
Zea mays L. subsp. mays (Maize Group) · Maize
MBS Europe (FR)
Zea mays L. · Maize
MAS SEEDS
Lepidium sativum L. · Garden cress
Shabetia Oksana Mykolaivna, Pozniak Oleksandr Vasyl`ovych, Chaban Lesia Vasylivna,
Solanum lycopersicum L. · Tomato
Jean Clause Mercier
Zea mays L. · Maize
AMI SRL
Daucus carota L. · Carrot
Buret Fhilippe
Zea mays L. subsp. mays (Maize Group) · Maize
SICA L. G. SERVICES (FR)
Glycine max (L.) Merr. · Soybean
Sokol Tetiana Volodymyrivna, Tymchuk Serhii Mykhailovych, Kobyzieva Liubov Nykyforivna, Riabukha Serhii Stanislavovych, Chernyshenko Pavlo Volodymyrovych, Moshkova Olena Mykolaivna, Matushkin Viktor Oleksiiovych,
Eruca vesicaria (L.) Cav. subsp. sativa (Mill.) Thell. · Arugula
Scherbatiuk Ruslan Viktorovych, Vovk Zhanna Mykolaivna, Pozniak Oleksandr Vasyl`ovych,
Oryza sativa L. · Rice
LUGANO LEONARDO SRL
Zea mays L. · Maize
KWS SAAT SE & CO.KGAA
Zea mays L. · Maize
KWS SAAT SE & CO.KGAA
Spinacia oleracea L. · Spinach
Archipiano Murielle