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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 Alstroemeria 21 Calibrachoa 21 Tall fescue 19 Horseshoe pelargonium 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.

SGP4

Active

Lolium perenne L. · Perennial ryegrass

CZ
1 record

Pulcinella

Active

Lactuca sativa L. · Lettuce

DE
1 record

Rezi

Active

Sorbus L. · Mountain ash

HU
1 record

SG 123

Terminated

Brassica oleracea L. (Cauliflower Group) · Cauliflower

NL
1 record

Safa

Terminated

Solanum lycopersicum L. · Tomato

IT
1 record

Prigobello

Active

Solanum lycopersicum L. · Tomato

DE
1 record

Romance

Protection expired

Alstroemeria L. · Alstroemeria

NL
1 record

Odeskyi 302

Application submitted

Sorghum Moench · Sorghum

UA
1 record

Ramos

Application submitted

Allium fistulosum L. · Welsh onion

HU
1 record

Pilgrim

Withdrawn

Brassica oleracea L. (Broccoli Group) · Broccoli

NL
1 record

Nautilus F1

Active

Brassica oleracea L. (Cauliflower Group) · Cauliflower

UA
1 record

Keratsuda

Active

Vitis vinifera L. · Common grape vine

BG
1 record

Jubilee

Withdrawn

Brassica oleracea L. (Cauliflower Group) · Cauliflower

NL
1 record

Krymske

Terminated

Malus domestica (Suckow) Borkh. · Apple

UA
1 record

Kardinal

Terminated

Solanum tuberosum L. · Potato

SK
1 record

Havana

Active

Alstroemeria L. · Alstroemeria

NL
1 record

KWS Helia 04

Application submitted

Helianthus annuus L. · Sunflower

UA
1 record

Joudi

Terminated

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

NL
1 record

ES Sakson

Active

Helianthus annuus L. · Sunflower

UA
2 records

Daytona F1

Protection expired

Allium cepa L. · Onion

Bejo Zaden (NL)

SI
1 record

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