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 Calibrachoa 21 Alstroemeria 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.

Saffron

Terminated

Allium cepa L. var. aggregatum G. Don · Shallot

2 records

Gandhi

Terminated

Brassica oleracea L. (Cauliflower Group) · Cauliflower

2 records

Chablis

Terminated

Solanum lycopersicum L. · Tomato

2 records

Calix

Terminated

Capsicum annuum L. · Bell pepper

2 records

Agnes

Active

Festuca arundinacea Schreb. · Tall fescue

2 records

Zuccini grey

Terminated

Cucurbita pepo L. · Field pumpkin

2 records

Visir

Active

Zea mays L. · Maize

2 records

V8

Active

Agrostis stolonifera L. · Creeping bentgrass

2 records

Tough Boy

Terminated

Solanum lycopersicum L. · Tomato

2 records

Tokyo White Cross

Active

Brassica rapa L. var. rapa (L.) Thell. · Turnip

2 records

Serena

Active

Lactuca sativa L. · Lettuce

2 records

Saturn 45

Active

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

2 records

Phoenix

Terminated

Solanum lycopersicum L. · Tomato

3 records

Redondo

Terminated

Capsicum annuum L. · Bell pepper

2 records

Renclod Althan

Active

Prunus domestica L. · European plum

2 records

Nerone

Active

Brassica oleracea L. (Broccoli Group) · Broccoli

2 records

Redshine

Active

Beta vulgaris Garden Beet Group · Garden beet

2 records

Mirazh

Active

Tulipa L. · Tulip

2 records

Mino Early

Active

Raphanus sativus L. var. niger (Mill.) S. Kerner · Black radish

2 records

Legacy

Protection expired

Brassica oleracea L. (Broccoli Group) · Broccoli

2 records

Merlin

Active

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

2 records

Fuego

Terminated

Solanum lycopersicum L. · Tomato

3 records

Kordial

Active

Brassica oleracea L. (Kohlrabi Group) · Kohlrabi

2 records

Ishikura

Terminated

Allium fistulosum L. · Welsh onion

2 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.