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.
Angelonia Bonpl. · Angelonia
UNGER JUNG| Helmut Unger (Unger Jungpflanzen Vertriebs- und Zuechtungs-GmbH)
Pelargonium zonale (L.) L'Hér. · Horseshoe pelargonium
Siegfried Klemm
Solanum lycopersicum L. · Tomato
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Solanum lycopersicum L. · Tomato
Seminis Vegetable Seeds
Zea mays L. · Maize
BORYSOV VIKTOR
Brassica oleracea L. (Cauliflower Group) · Cauliflower
Rijk Zwaan (NL)
Zea mays L. · Maize
PANAM FRANCE SARL
Lactuca sativa L. · Lettuce
Graines Gautier SA (FR)
Raphanus sativus L. var. sativus · Radish
Syngenta Crop Protection AG
Beta vulgaris Garden Beet Group · Garden beet
Sakata Vegetables Europe S.A.S
Spinacia oleracea L. · Spinach
Sakata Seed Corporation, JP
Pelargonium L'Hér. ex Ait. · Geranium
Mirco VAVRA (AT)
Brassica oleracea L. (Cauliflower Group) · Cauliflower
Enza Zaden Beheer B.V.
Phaseolus vulgaris L. · Common bean
HM.CLAUSE
Solanum lycopersicum L. · Tomato
Bejo Zaden B.V.
Capsicum annuum L. · Bell pepper
Sakata Seed Corporation, JP
Solanum lycopersicum L. · Tomato
Ikasido Global Group BV, NL
Spinacia oleracea L. · Spinach
VEGETABLE MONSANTO B.V.
Brassica oleracea L. (Broccoli Group) · Broccoli
BURPEE NL B.V.
Lactuca sativa L. · Lettuce
Domaine Public (FR)
Cucumis sativus L. · Cucumber
VEGETABLE MONSANTO B.V.
Triticum aestivum L. · Bread wheat
BESPALOVA LYuDMILA ANDREEVNA / PUZYRNAYa OL'GA YuR'EVNA / NOVIKOV ALEKSEJ VLADIMIROVICh / KERIMOV VAGIF RAHMETOVICh / ABLOVA IRINA BORISOVNA / LYSAK NIKOLAJ IVANOVICh / BUKREEVA GALINA IVANOVNA / KUDRYaShOV IGOR' NIKOLAEVICh / ZIMA VALENTINA GRIGOR'EVNA /
Poa pratensis L. · Kentucky bluegrass
RUTGERS UNIVERSITY OF NEW JERSEY
Brassica oleracea L. (Cauliflower Group) · Cauliflower
HM.CLAUSE