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.

SAKIMP044

Active

Impatiens New Guinea Group · New Guinea Impatiens

SATO CHIHIRO|MINEMURA SHINJI

5 records

Reveille

Active

Poa arachnifera x P. pratensis

Texas Agricultural Experiment Station

5 records

Pacgreta

Active

Pelargonium zonale (L.) L'Hér. · Horseshoe pelargonium

Martin Geibel c/o Elsner pac Jungpflanzen GbR

6 records

KLECA22915

Active

Calibrachoa Cerv. · Calibrachoa

Klemm+Sohn GmbH &Co.KG

5 records

JGCAL09404

Active

Calibrachoa Cerv. · Calibrachoa

Plant 21 LLC

6 records

Bonscalib

Active

Scaevola aemula R. Br. · Fairy fan-flower

Bernuetz Andrew|Silversdale, AU

5 records

Balcabooni

Active

Calibrachoa Cerv. · Calibrachoa

Winslow Benjamin K. / Masor Laura L.

5 records

ES Hudson SU

Active

Helianthus annuus L. · Sunflower

Euralis Semences

IT SK UA

6 records

Stelaris CLP

Active

Helianthus annuus L. · Sunflower

Saaten Union Romania, RO

RO UA

6 records

Davero SU

Active

Helianthus annuus L. · Sunflower

Saaten Union, RO

RO UA

8 records

DKC5170

Active

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

MONSANTO TECHNOLOGY

ES FR HR

4 records

ES Amis CL

Protection expired

Helianthus annuus L. · Sunflower

Tierry Andre

CZ IT SK UA

5 records

Vivallto CLP

Active

Helianthus annuus L. · Sunflower

RAGT 2N S.A.S

IT UA

5 records

PR38N86

Active

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

Pioneer Hi-Bred International, Inc Pioneer Overseas Corporation

FR HR PL

4 records

Colibri

Active

Solanum lycopersicum L. · Tomato

HM.CLAUSE

FR HR PL

4 records

Zennith

Active

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

Seminis Vegetable Seeds

ES NL

5 records

WEKsunspat

Active

Rosa L. · Rose

Weeks Roses Inc (US)

FR IT

4 records

Thesee

Terminated

Triticum aestivum L. · Bread wheat

Verneuil Recherche SA (FR)

FR IE

6 records

Victoria

Protection expired

Pelargonium L'Hér. ex Ait. · Geranium

Blair L. WINNER (US)

FR NL

4 records

SY Argona

Active

Helianthus annuus L. · Sunflower

Syngenta Crop Protection AG

ES IT

4 records

Ritmo

Active

Cucumis sativus L. · Cucumber

ZKI, H

HU SK

4 records

Marksman

Active

Festuca arundinacea Schreb. · Tall fescue

E.F.BURLINGHAM SONS

ES IT

5 records

Lumen

Active

Brassica napus L. · Rapeseed

Norddeutsche Pflanzenzucht Hans-Georg Lembke KG

EE LT

4 records

Lital

Active

Lactuca sativa L. · Lettuce

VENTURA/AZOULAY/NETZER

BG ES

6 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.