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.
Capsicum annuum L. · Bell pepper
RESPUBLIKANSKOE NAUCHNO-PROIZVODSTVENNOE UNITARNOE DOCHERNEE PREDPRIYATIE «INSTITUT OVOSHHEVODSTVA»
Zea mays L. · Maize
Kalinichenko Artem Oleksandrovych, Didenko Kostiantyn Oleksandrovych,
Cucumis sativus L. · Cucumber
GENESIS SEEDS LTD
Brassica oleracea L. (Brussels Sprouts Group) · Brussels sprouts
HORAL JIRI / ALEKSEEV YuRIJ BORISOVICh
Zea mays L. · Maize
KWS SAAT SE & CO.KGAA
Helianthus annuus L. · Sunflower
Brahin Oleksandr Mykolaiovych, Popova Ol`ha Andriivna, Kryvosheieva Olena Vatslavivna, Veselyi Vitalii Oleksandrovych, Kuzmyshena Nadiia Viktorivna, Syvenko Valentyna Ivanivna, Makliak Kateryna Mykolaivna, Alad`ina Zoia Kyrylivna, Kyrychenko Viktor Vasyl`
Foeniculum vulgare Mill. · Fennel
LA SEMIORTO SEMENTI SRL
Lactuca sativa L. · Lettuce
Seminis Vegetable Seeds
Zea mays L. · Maize
Lebid` IEvhen Makarovych, Voskoboinyk Oleksandr Vasyl`ovych, Nehoda Tetiana Volodymyrivna, Marochko Valentyna Anatoliivna, Moroz Volodymyr Vasyl`ovych, Olizko Oleksii Petrovych, Borysov Viktor Mykolaiovych, Antoniuk Serhii Petrovych, Cherchel Vladyslav IU
Beta vulgaris Fodder Beet Group · Mangelwurzel
Domaine Public (FR)
Brassica rapa L. var. rapa (L.) Thell. · Turnip
Mikado Kyowa Seed Co. Ltd. (JP)
Vicia faba L. var. major Harz · Broad bean
Przedsiębiorstwo Nasiennictwa Ogrodniczego i Szkółkarstwa Spółka Akcyjna w upadłości likwidacyjnej \Instytut Ogrodnictwa - Państwowy Instytut Badawczy
Solanum lycopersicum L. · Tomato
Hazera Genetics Ltd (IL)
Olea europaea L. · Olive
INCONNU (FR)
Helianthus annuus L. · Sunflower
Reinhard Bräuer
Lolium multiflorum Lam. · Italian ryegrass
F.LLI COZZI S.N.C.
Cucurbita pepo L. · Field pumpkin
SATIVA SOC. COOP. A R.L.
Avena sativa L. · Oat
ISEA S.P.A.
Zea mays L. subsp. mays (Maize Group) · Maize
R 2n (FR)
Cucumis sativus L. · Cucumber
Syngenta Seeds B.V.
Solanum lycopersicum L. · Tomato
Geoponiko Spiti AEBE
Vicia faba L. var. major Harz · Broad bean
AGRIN MAROC
Ocimum basilicum L. · Basil
Jan Draaistra
Zea mays L. · Maize
Plotka Vitalii Vitaliiovych, Kyrpa Mykola IAkovych, Ilchenko Larysa Anatoliivna, Nehoda Tetiana Volodymyrivna, Marochko Valentyna Anatoliivna, Fedko Mykola Mykolaiovych, Olizko Oleksii Petrovych, Cherchel Vladyslav IUriiovych, Dziubyts`kyi Borys Volodymyr