Variety traits
Heat tolerance is a plant's genetic ability to maintain metabolic activity and productivity under high temperature conditions. It manifests as resistance to protein denaturation, turgor loss, and generative organ mortality.
Mentioned in descriptions 1 598 varieties reference book.
Heat tolerance is a genetically determined ability of plants to withstand high air and soil temperatures without significant damage to development and yield. When critical values, typically ranging from 35–40 °C, are exceeded, processes of protein denaturation and cell membrane degradation begin in plant tissues. Externally, this manifests as wilting, the appearance of heat scorch, flower/fruit abscission, and pollen mortality, leading to significant yield losses and sterility.
This trait is not static and changes during plant ontogeny: the seedling and flowering stages are considered the most vulnerable to overheating. Variety resistance is ensured by two key strategies: an overheating avoidance mechanism based on intensive transpiration via a well-developed root system, and physiological endurance. The latter includes the ability of cells to retain bound water, increased cytoplasm viscosity, and the active synthesis of specialized heat-shock proteins/enzymes.
Evaluation of variety heat tolerance is carried out using laboratory climate chambers or field express-methods, measuring the degree of tissue browning, chlorophyll fluorescence, or proline concentration in cells as a stress marker. Varieties with high heat tolerance are capable of consistent fruiting at temperatures of 35–40 °C and above, whereas low tolerance leads to functional inhibition as early as 30–35 °C. A temperature of 50 °C is considered the critical threshold for most agricultural crops, leading to cell death.
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. (Cauliflower Group) · Cauliflower
HM Clause Inc (US)
Solanum lycopersicum L. · Tomato
HM.Clause S.A.S.
Triticum aestivum L. · Bread wheat
Lyfenko Lina Semenivna, Fedchenko Volodymyr Pavlovych, Bosakovska Nataliia IUriivna, Rodenko Halyna Anatoliivna, Shpykuliak IEvhenii Anatoliiovych, Narhan Tetiana Pavlivna, Nakonechnyi Mykola IUriiovych, Yeryniak Mykola Ivanovych, Lyfenko Savelii Pylypovy
Zea mays L. · Maize
HILLESHOG - NK SPA
Phaseolus vulgaris L. · Common bean
SVS Holland B.V.
Allium cepa L. var. cepa · Onion
Bejo Zaden B.V., De Groot en Slot B.V.
Lactuca sativa L. · Lettuce
Domaine Public (FR)
Pelargonium L'Hér. ex Ait. · Geranium
GOLDSMITH SEEDS Inc. (USA) (US)
Solanum lycopersicum L. · Tomato
HAZERA GENET./YISSUM RESE
Cucumis sativus L. · Cucumber
HORTAG SEED CO.
Brassica oleracea L. (Cauliflower Group) · Cauliflower
Bejo Zaden B.V.
Lactuca sativa L. · Lettuce
Vilmorin-Mikado S.A.S.
Cucurbita moschata Duchesne · Butternut squash
Sakata Seed Sudamerica Ltda. (SDA)
Prunus dulcis (Mill.) D. A. Webb · Almond
Yadrov Oleksandr Oleksiiovych, Chernobai Iryna Heorhiivna,
Citrullus lanatus (Thunb.) Matsum. & Nakai · Watermelon
Dr Eyal Vardi
Solanum lycopersicum L. var. lycopersicum · Tomato
Consorzio Sativa Societa Cooperativa Agricola
Brassica oleracea L. (Cauliflower Group) · Cauliflower
Bejo Zaden B.V.
Lactuca sativa L. · Lettuce
Domaine Public (FR)
Citrullus lanatus (Thunb.) Matsum. & Nakai · Watermelon
Syngenta Seeds B.V.
Capsicum annuum L. · Bell pepper
ZERAIM GEDERA
Cucurbita pepo L. · Field pumpkin
OI ZHANG
Pelargonium zonale (L.) L'Hér. · Horseshoe pelargonium
GOLDSMITH SEEDS
Solanum lycopersicum L. · Tomato
NIRIT SEEDS
Zea mays L. · Maize
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