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.

Confiance

Active

Cichorium endivia L. · Endive

Enza Zaden Beheer B.V.

5 records

Contrai

Active

Lactuca sativa L. · Lettuce

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

5 records

DANVERS 126

Active

Daucus carota L. · Carrot

SMEDEKS Co d.o.o

3 records

Crucible

Active

Brassica oleracea L. (Broccoli Group) · Broccoli

Bayer Holland B.V.

3 records

Corona

Protection expired

Impatiens L. · Balsam

Mikkelsen, James C.|Ashtabula, OH

3 records

Casey

Active

Lactuca sativa L. · Lettuce

Enza Zaden Beheer

7 records

Cartagena

Active

Phaseolus vulgaris L. · Common bean

Seminis Vegetable Seeds

5 records

Carmel

Active

Spinacia oleracea L. · Spinach

POP VRIEND BV

3 records

Butterfly

Protection expired

Argyranthemum frutescens (L.) Sch. Bip. · Marguerite daisy

WILHELM SCHMÜLLING

3 records

Blueray

Active

Cucumis sativus L. · Cucumber

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

4 records

Amedeo

Active

Triticum durum Desf. · Durum wheat

Universita degli Studi di Catania Istituto di Agronomia Generale e Coltivazioni Erbacee

4 records

Zahov

Active

Solanum tuberosum L. · Potato

THE INSTITUTE OF FIELD + GARDEN CROPS

4 records

Abilene Russet

Active

Solanum tuberosum L. · Potato

Interseed Potatoes GmbH

6 records

Woori Tower

Active

Lilium L. · Lily

Kim Jae-Seo

3 records

Tesshine

Active

Alstroemeria L. · Alstroemeria

Horti Partners V.O.F.

3 records

Sunjiradai

Active

Begonia x tuberhybrida Voss · Tuberous begonia

Yamaguchi Hideki

4 records

Tesdoba

Active

Alstroemeria L. · Alstroemeria

Horti Partners V.O.F.

3 records

SAKPXC044

Application submitted

x Petchoa J. M. H. Shaw · Petchoa

Moriya Kawashima

3 records

Sunbelsoil

Active

Calibrachoa Cerv. · Calibrachoa

Takeshi Kanaya

3 records

Sunbelkupapi

Terminated

Calibrachoa Cerv. · Calibrachoa

Yasuyuki Murakami

3 records

SAKIMP077

Application submitted

Impatiens New Guinea Group · New Guinea Impatiens

SHINJI MINEMURA

3 records

SETZ0001

Active

Phedimus spurius (M. Bieb.) 't Hart · Two-row stonecrop

Syngenta Participations AG

3 records

Poulpar094

Active

Rosa L. · Rose

Poulsen Roser A/S

4 records

Poco Red

Active

Kniphofia Moench · Red hot poker

Janet N. Egger

3 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.