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.

Inbar

Active

Solanum lycopersicum L. · Tomato

NOA RONNA SABBAG

1 record

Lanmaryland

Terminated

Mandevilla sanderi (Hemsl.) Woodson · Brazilian jasmine

D.H.M Innovation S.A.S.

1 record

Hot Pink

Active

Callistemon viminalis (Sol. ex Gaertn.) G. Don · Weeping bottlebrush

JOHAN LEON SCHOLTZ

1 record

KLEOE21634

Active

Osteospermum L. · Osteospermum

MAIKE BOXRIKER

1 record

KLEKB20038

Active

Kalanchoe blossfeldiana Poelln. · Flaming Katy

Henk Dresselhuys

1 record

Kolmaloir

Application submitted

Salvia xjamensis J. Crompton · Jame sage

Kolster Holding B.V.

1 record

KLEKB20027

Terminated

Kalanchoe blossfeldiana Poelln. · Flaming Katy

Henk Dresselhuys

1 record

Kimono

Active

x Heucherella H. R. Wehrh. · Foamy bells

TERRA NOVA NURSERIES INC

1 record

KLEDB18008

Active

Diascia barberae Hook. f. · Twinspur

Klemm + Sohn GmbH & Co. KG^^^Nils Klemm^^^Katinka Wilde

1 record

JBG AH-64

Terminated

Hibiscus rosa-sinensis L. · Chinese hibiscus

James Berry

1 record

IPT164415

Active

Rosa L. · Rose

Interplant Roses B.V

1 record

DVERDEPINK

Terminated

Verbena L. · Vervain

Gavriel Danziger

1 record

DVER70

Terminated

Verbena L. · Vervain

Gavriel Danziger

1 record

Evevic

Withdrawn

Rosa L. · Rose

Les Roses Anciennes André Eve S.A.S.

1 record

ET EPB 1717

Active

Helleborus orientalis x Helleborus x ericsmithii

Eternal Plant Boijl B.V.

1 record

Garvivian

Terminated

Gerbera L. · Gerbera

FLORIST HOLLAND B.V.

1 record

DANTAN26

Terminated

Lantana camara L. · Lantana

Gavriel Danziger

1 record

Balmibepro

Terminated

Penstemon Schmidel. · Beard Tongue

Valentin Taquet

1 record

Balcebibu

Terminated

Impatiens New Guinea Group · New Guinea Impatiens

LESLIE HEFFRON

1 record

Bombay Red

Withdrawn

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

Henricus G.A. van der Boog

1 record

Balfiremint

Application submitted

Verbena L. · Vervain

Laura L. Masor

1 record

Baldadenwhi

Active

Dahlia Cav. · Dahlia

JEROEN GITZELS

1 record

Balfireitim

Active

Verbena L. · Vervain

Laura L. Masor

1 record

Baldaora

Terminated

Dahlia Cav. · Dahlia

JEROEN GITZELS

1 record

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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.