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Variety traits

Heat tolerance

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.

Sources10

Breakdown by crop

Heat tolerance of tomato 14 Heat tolerance — Cauliflower 13 Heat tolerance of maize 10 Heat tolerance in pepper 8 Heat Tolerance — Soft Wheat 7 Heat tolerance of lettuce 7 Heat Tolerance — Tall Fescue 5 Heat Tolerance — Broccoli 5 Heat tolerance of Calibrachoa 4 Heat tolerance of common bean 4 Heat tolerance of garden strawberry 4 Heat Tolerance in White Cabbage 4 Heat tolerance of cucumber 4 Heat tolerance of sunflower 3

Found in these crops

Tomato 52 Lettuce 42 Cauliflower 35 Bread wheat 35 Maize 34 Rose 24 Cucumber 23 Sunflower 23 Alstroemeria 21 Calibrachoa 21 Tall fescue 19 White cabbage 17

Varieties that feature this in their description

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.

Pronto OR7

Active

Helianthus annuus L. · Sunflower

Skakunenko, Vladyslava

UA
2 records

Plummini Red

Active

Solanum lycopersicum L. · Tomato

Hem Zaden B.V.

NL
2 records

Otrada

Active

Prunus avium (L.) L. · Sweet cherry

Kischak Olena Anatoliivna, Yarushnykov Volodymyr Volodymyrovych, Taranenko Liliia Ivanivna,

UA
2 records

Oleta

Terminated

Lactuca sativa L. · Lettuce

Les Graines Caillard Sa (FR)

FR
2 records

Otello F1

Terminated

Solanum melongena L. · Eggplant

Dymchenko Tetiana Mykolaivna, Muzhylko Viktor Valentynovych,

UA
2 records

NOA DECORA

Withdrawn

Pelargonium L'Hér. ex Ait. · Geranium

SCA BURY (FR)

FR
1 record

Nikits`ka Aromatna

Terminated

Acca sellowiana (Berg) Burret · Feijoa

Shyshkina Olena Leonidivna, Sholokhova Violetta Antonivna,

UA
2 records

Nikits`kyi Podarok

Terminated

Prunus persica (L.) Batsch · Peach

Fedorova Ol`ha Stepanivna, Smykov Volodymyr Karpovych, Smykov Anatolii Volodymyrovych, Parfil`ieva Zoia Mykolaivna,

UA
2 records

MTI

Terminated

Zea mays L. · Maize

Kyrpa Mykola IAkivovych, Antoniuk Serhii Petrovych, Cherchel Vladyslav IUriiovych, Dziubetskyi Borys Volodymyrovych,

UA
2 records

Nikits`kyi Rannii

Terminated

Punica granatum L. · Pomegranate

Rzhevkin Anatolii Oleksiiovych

UA
2 records

Muscade

Terminated

Daucus carota L. · Carrot

Service Officiel de Controle (FR)

FR
1 record

Mongal

Withdrawn

Solanum lycopersicum L. · Tomato

INSTITUT NATIONAL DE LA RECHERCHE AGRONOMIQUE, FR

FR
1 record

New Kuroda AS

Active

Daucus carota L. · Carrot

Kyoung Chol Kim

UA
2 records

Milena

Withdrawn

Zea mays L. · Maize

KWS MOMONT SAS

IT
1 record

Metalia

Active

Lactuca sativa L. var. capitata L. · Head lettuce

Nunhems B.V.

UA
1 record

Metalist

Terminated

Triticum aestivum L. · Bread wheat

Leonov Oleh IUriiovych, Kraievs`kyi Anatolii Mykolaiovych, Karpenko Oleksandr Oleksandrovych, Zinkovs`ka Inna Oleksandrivna,

UA
2 records

MASCHAME

Active

Rosa L. · Rose

Jean Pierre GUILLOT (FR)/Dominique MASSAD (FR)

FR
1 record

Metalist

Terminated

Helianthus annuus L. · Sunflower

Popov Vitalii Mykolaiovych, Borovs`ka Iryna IUriivna, Lebedenko IEvhen Oleksandrovych, Shepilov Borys Petrovych, Satarov Oleksandr Zainulovych, Leonova Nina Mykolaivna, Kuzmyshena Nadiia Viktorivna, Kolomatska Valeriia Pavlivna, Makliak Kateryna Mykolaivn

UA
2 records

Merkurii

Terminated

Prunus persica (L.) Batsch · Peach

Latsko Tetiana Anatoliivna, Lobanovs`ka Valentyna Fedorivna, Fedorova Ol`ha Stepanivna, Smykov Volodymyr Karpovych, Smykov Anatolii Volodymyrivna,

UA
2 records

Manille

Terminated

Solanum lycopersicum L. · Tomato

Tezier SA (FR)

FR
1 record

Maxim

Withdrawn

Solanum lycopersicum L. · Tomato

Dutch American Plantbreeders Corp.

PL
1 record

Marmeladka

Active

Beta vulgaris Garden Beet Group · Garden beet

Vovk Zhanna Mykolaivna

UA
2 records

Leineperle

Terminated

Fuchsia L. · Fuchsia

STRUEMPER| Karl Struemper

DE
1 record

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