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 Bread wheat 35 Cauliflower 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.

SR3150

Active

Festuca ovina L. · Sheep's fescue

PICKSEED

3 records

Skytree

Active

Brassica oleracea L. (Broccoli Group) · Broccoli

MONSANTO VEGETABLE IP MANAGEMENT B.V.

4 records

Reska

Active

Triticum aestivum L. · Bread wheat

A. Tajnšek (SI)

4 records

RODNIChOK

Active

Cucumis sativus L. · Cucumber

PRIDNESTROVSKIJ NIISX

3 records

PL 524

Active

Zea mays L. · Maize

Umut Cobankent

5 records

Paratie

Terminated

Lactuca sativa L. · Lettuce

Rijk Zwaan Zaadteelt en Zaadhandel BV (NL)

4 records

Nemesis

Terminated

Triticum durum Desf. · Durum wheat

Eurodur S.A.

5 records

NuBlue

Protection expired

Poa pratensis L. · Kentucky bluegrass

Jacklin Seed Company

3 records

Mykonos

Active

Brassica oleracea L. (Broccoli Group) · Broccoli

SAKATA SEED CORPORATION / SAKATA SEED CORPORATION

5 records

Macumba

Active

Festuca arundinacea Schreb. · Tall fescue

RAGT 2N S.A.S

4 records

Klegoes

Protection expired

Pelargonium L'Hér. ex Ait. · Geranium

Siegfried Klemm

3 records

Gusta

Active

Zea mays L. subsp. mays (Sweet Corn Group) · Sweet corn

Zelseed spol, SLO

4 records

Green Presto

Active

Brassica oleracea L. (White Cabbage Group) · White cabbage

TOKITA SEMENTI ITALIA SRL, IT

3 records

Hillwood

Active

Cucumis sativus L. · Cucumber

FRANK FRANCIS

3 records

Golden sweet

Active

Pisum sativum L. · Pea

THE REAL SEED COLLECTION LTD

4 records

Giove

Active

Cichorium intybus L. · Chicory

Henk Driessen

4 records

Fresco

Active

Brassica oleracea L. (White Cabbage Group) · White cabbage

BEJO ZADEN B.V, NL

5 records

Fresena

Active

Fargesia murielae (Gamble) T.P.Yi · Umbrella bamboo

Margot Poplawski / Klaus Poplawski

3 records

Fine Pro

Active

Festuca rubra L. · Red fescue

Semillas Fitó S.A.

3 records

Endurance

Active

Poa pratensis L. · Kentucky bluegrass

PURE SEED TESTING

3 records

Elmoro

Active

Phaseolus vulgaris L. · Common bean

Blumen Group S.p.A. (IT)

4 records

Driada 1

Active

Triticum aestivum L. · Bread wheat

Ushkarenko Viktor Oleksandrovych, Orliuk Anatolii Pavlovych, Lazer Petro Nartsysovych, Zhuzha Oleksandr Dmytrovych, Honcharova Kapitolina V'iacheslavivna, Bazalii Halyna Hryhorivna,

5 records

Deangelia

Active

Lactuca sativa L. · Lettuce

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

6 records

David

Active

Brassica oleracea L. (Cauliflower Group) · Cauliflower

Syngenta Seeds, NL

3 records

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Variety traits

Maturity group 89 063
Yield 67 000
Vigor 53 548
Plant height 51 504
Lodging 50 198
Taste and aroma 36 010
Variety origin 29 523
Productivity 27 845

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Text source

This summary is compiled from the publications listed in the sources and verified by an editor. It contains no legally significant information; it provides agronomic context for registry data rather than the registry data itself.