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 Sunflower 23 Cucumber 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.

234 B

Active

Helianthus annuus L. · Sunflower

Agri Genetics Company (US)

2 records

Red Velvet

Active

Mandevilla Lindl. · Mandevilla

John Gray

2 records

UF18-62-10

Active

Plectranthus scutellarioides (L.) R. Br. · Coleus

David G. Clark

2 records

UF14-24-1

Active

Plectranthus scutellarioides (L.) R. Br. · Coleus

Grayson M. Clark^^^David G. Clark

3 records

Schedrist` odes`ka

Active

Triticum aestivum L. · Bread wheat

Babaiants Lazar Tihranovych, Holub IEvheniia Anatoliivna, Honcharuk Nina Oleksandrivna, Lytvynenko Mykola Antonovych, Lytvynenko Raisa Ivanivna, Reshetnikova Valentyna Semenivna, Rubakha Serhii Andriiovych, Solomonov Ruslan Viacheslavovych, Parfentiev Myk

3 records

Goodman

Active

Brassica oleracea L. (Cauliflower Group) · Cauliflower

BG CZ HR HU NL PL +1

11 records

Great Lakes 118

Active

Lactuca sativa L. · Lettuce

BG HR IT SI

8 records

Marumba

Active

Cucumis sativus L. · Cucumber

CZ HU NL SK

5 records

Tendergreen

Active

Phaseolus vulgaris L. · Common bean

FR IT

6 records

Capri

Active

Fragaria x ananassa Duchesne ex Rozier · Garden strawberry

NL UA

9 records

Ashley

Active

Cucumis sativus L. · Cucumber

ES IT

5 records

SY Facto

Active

Zea mays L. subsp. mays (Maize Group) · Maize

Syngenta Crop Protection AG, CH

FR NL

3 records

Shady Lady

Application submitted

Solanum lycopersicum L. · Tomato

Rene Khenkuet

NL UA

4 records

Rebecca

Terminated

Dianthus L. · Carnation

NOBBIO GIACOMO

FR HU IT

3 records

Fedor

Terminated

Triticum aestivum L. · Bread wheat

W. von Borries-Eckendorf GmbH & Co.KG

4 records

Venosa

Active

Brassica oleracea L. (Cauliflower Group) · Cauliflower

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

NL UA

3 records

SV3336JB

Active

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

Meinardus P.Boon

NL UA

6 records

Santil

Protection expired

Phaseolus vulgaris L. · Common bean

NUNHEMS ZADEN

ES NL

3 records

Rulis

Protection expired

Rosa L. · Rose

DE RUITER'S NIEUWE ROZEN

FR NL

3 records

Reglice

Terminated

Lactuca sativa L. · Lettuce

Vilmorin-Mikado S.A.S.

FR HR

4 records

PR38A79

Protection expired

Zea mays L. subsp. mays (Maize Group) · Maize

PIONEER OVERSEAS CORPORATION US

FR HR

3 records

Plein blanc Pascal

Active

Apium graveolens L. var. dulce (Mill.) Pers. · Celery

Rocalba (ES)

FR SI

3 records

National 2

Active

Raphanus sativus L. var. sativus · Radish

Domaine Public (FR)

CZ FR

3 records

Maravia

Application submitted

Lactuca sativa L. · Lettuce

Vilmorin-Mikado S.A.S.

CZ FR

4 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.