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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.

Fiorentino

Active

Solanum lycopersicum L. · Tomato

NL
3 records

Gallop

Terminated

Allium fistulosum L. · Welsh onion

NL
2 records

Gold Ball

Active

Cucurbita pepo L. · Field pumpkin

CZ
2 records

Gentility

Active

Citrullus lanatus (Thunb.) Matsum. & Nakai · Watermelon

HU
2 records

Cowichan

Active

Rubus idaeus L. · Red raspberry

NL
4 records

Blue Wave

Active

Poa pratensis L. · Kentucky bluegrass

CZ
2 records

Autumn Prince

Terminated

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

CZ
2 records

Aswad

Terminated

Solanum melongena L. · Eggplant

NL
2 records

Batavus

Active

Lactuca sativa L. · Lettuce

CZ
2 records

Black King

Active

Solanum melongena L. · Eggplant

NL
2 records

AS 15280

Active

Zea mays L. · Maize

UA
3 records

Renoirciv

Active

Malus domestica (Suckow) Borkh. · Apple

5 records

Cayenna

Active

Capsicum annuum L. · Bell pepper

IT
2 records

Kosmo Purple-Red

Terminated

Celosia argentea L. var. cristata (L.) Kuntze · Cockscomb

Maurits

NL
1 record

Joya

Active

Solanum lycopersicum L. var. lycopersicum · Tomato

SOUTHERN SEED S.R.L.

IT
1 record

Stox Rose Pink

Active

Matthiola incana (L.) R. Br. · Hoary stock

Evanthia B.V.

1 record

StoX Champagne

Active

Matthiola incana (L.) R. Br. · Hoary stock

Evanthia B.V.

1 record

Genovalo

Terminated

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

Gerd Endisch

1 record

Dopelsurwhi

Terminated

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

Dümmen Group B.V.

1 record

Yellou Peshen

Active

Solanum lycopersicum L. · Tomato

Tovarystvo z obmezhenoiu vidpovidalnistiu "SPARK SIDZ"

UA
2 records

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