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.

Skywalker

Active

Brassica oleracea L. (Cauliflower Group) · Cauliflower

Bejo Zaden BV (NL)

BG CZ HR HU NL PL +1

11 records

Sitel

Active

Medicago sativa L. · Alfalfa

Tourneur Grandes Cultures Obtentions SNC (FR)

AT DK ES FR HR PL +1

13 records

Majestic

Active

Rubus idaeus L. · Red raspberry

Scott W Adams

13 records

PR38N86

Active

Zea mays L. · Maize

PIONEER OVERSEAS CORPORATION

AT BG HU IT SI SK +1

13 records

Malou

Active

Solanum tuberosum L. · Potato

Germicopa SAS, FR

FR PT

12 records

Amazing

Active

Brassica oleracea L. (Cauliflower Group) · Cauliflower

Bejo Zaden B.V.

BG CZ HU NL PL SK

9 records

PR38A79

Active

Zea mays L. · Maize

Todd Piper

AT BG HU SI UA

12 records

Locris

Active

Brassica oleracea L. (Cauliflower Group) · Cauliflower

Vilmorin SA (FR)

CZ FR HU PL UA

8 records

Gigant

Active

Brassica oleracea L. (Kohlrabi Group) · Kohlrabi

SATIMEX QUEDLINBURG HANDELSGESELLSCHAFT GmbH

CZ DE SK UA

8 records

VSL 2

Active

Prunus L. · Plum

DE NL

10 records

Destiny

Active

Solanum tuberosum L. · Potato

Suelmann, Cornelus / Suelmann, Johannes Josephus

MT NL

11 records

Wekplapep

Active

Rosa L. · Rose

Weeks Roses

8 records

Meisponge

Active

Rosa L. · Rose

MEILLAND INTERNACIONAL

8 records

Transam

Active

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

Bejo Zaden B.V.

CZ HU NL PL SK

8 records

Cruiser

Protection expired

Brassica oleracea L. (Broccoli Group) · Broccoli

Royal Sluis BV, NL-1600 AA Enkhuizen

CZ ES HU PL SK

7 records

Sagess

Active

Lactuca sativa L. · Lettuce

Vilmorin-Mikado S.A.S.

CZ FR HR HU

8 records

KWS Amores CL

Active

Helianthus annuus L. · Sunflower

KWS, D

IT RO SK UA

11 records

Green Magic

Active

Brassica oleracea L. (Broccoli Group) · Broccoli

SSC JP

HR NL UA

8 records

Dracaris CLP

Active

Helianthus annuus L. · Sunflower

Euralis Semences, F

BG ES UA

10 records

ES Loris CLP

Active

Helianthus annuus L. · Sunflower

Euralis Semences, Mondonville FR

HU IT UA

10 records

Candid Charm

Active

Brassica oleracea L. (Cauliflower Group) · Cauliflower

SSC JP

HR NL SK

8 records

Avalanche

Active

Poa pratensis L. · Kentucky bluegrass

PURE SEED TESTING

ES IT PL

7 records

Bordo 237

Active

Beta vulgaris Garden Beet Group · Garden beet

Sortsemovošč

CZ LT UA

7 records

Alcantara

Active

Helianthus annuus L. · Sunflower

SYNGENTA FRANCE S.A.S.

IT PT UA

8 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.