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.
Anthurium Schott · Anthurium
Tagami, Hiroshi|Kaneohe, HI
Solanum lycopersicum L. · Tomato
Hem Zaden B.V.
Cucumis sativus L. · Cucumber
SEMILLAS FITO, S.A.
Solanum lycopersicum L. · Tomato
Hem Zaden B.V.
Festuca arundinacea Schreb. · Tall fescue
LEBANON TURF
Zea mays L. subsp. mays (Maize Group) · Maize
PIONEER OVERSEAS CORPORATION
Triticum aestivum L. · Bread wheat
Reznichenko Anatolii Ivanovych, Karamushka Liudmyla Fedorivna, Vasylenko Liudmyla Fedorivna, Honcharova Kapitolina V'iacheslavivna, Bazalii Halyna Hryhorivna, Orliuk Anatolii Pavlovych,
Solanum melongena L. · Eggplant
HAZERA (1939)
Prunus armeniaca L. · Apricot
SCEA PEPS (Pépinères Escande Programme Sélection)
Raphanus sativus L. · Radish
Sakata Seed Corporation
Triticum aestivum L. · Bread wheat
Babaiants Ol`ha Vadymivna, Syvolap IUrii Mykhailovych, Reshetnikova Valentyna Semenivna, Solomonov Ruslan Viacheslavovych, Lytvynenko Raisa Ivanivna, Rubakha Serhii Andriiovych, Holub IEvheniia Anatoliivna, Honcharuk Nina Oleksandrivna, Topal Mykola Mykol
Solanum lycopersicum L. · Tomato
Domaine Public (FR)
Solanum melongena L. · Eggplant
S.A.I.S. Societa Agricola Italiana Sementi
Alstroemeria L. · Alstroemeria
JWM Konst, Konst Breeding BV
Helianthus annuus L. · Sunflower
Ovuka Ielena, Radeka Ilija, Dedic Bosko, Jockovic Milan, Cvejic Sandra, Jocic Sinisa,
Brassica oleracea L. convar. botrytis (L.) Alef. · Cauliflower
CLAUSE-TEZIER
Triticum aestivum L. · Bread wheat
Usyk Liudmyla Oleksandrivna, Hrebeniuk Andrii Oleksandrovych, Honcharova Kapitalina V'iacheslavivna, Biliaieva Iryna Mykolaivna, Bazalii Halyna Hryhorivna, Orliuk Anatolii Pavlovych,
Panicum miliaceum L. · Proso millet
SCHITEA MARIAMARTURA TEODOR
Pisum sativum L. · Pea
Domaine Public (FR)
Lactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel BV (NL)
Leucanthemum maximum (Ramond) DC. · Maximum daisy
Pieter den Haan
Tagetes patula L. · French marigold
GOLDSMITH SEEDS
Brassica oleracea L. (Cauliflower Group) · Cauliflower
Syngenta Seeds B.V.
Solanum lycopersicum L. · Tomato
HAZERA GENETICS