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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 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.

Duealdublav

Active

Calibrachoa Cerv. · Calibrachoa

Tobias Dümmen

2 records

EviGsy155

Active

Hybrids between Clematis patens C. Morren & Decne. and Clematis viticella L.

RAYMOND J. EVISON

2 records

Georgie Yellow

Active

Diplacus aurantiacus (Curtis) Jeps. · Bush monkeyflower

Trees Scott C

2 records

Eclaire

Active

Rosa L. · Rose

YOKOTA KEIICHI

3 records

DSCAVBLTCH

Active

Scaevola aemula R. Br. · Fairy fan-flower

Gavriel Danziger

2 records

DSALBIBLUE

Terminated

Salvia farinacea Benth. · Mealycup sage

Gavriel Danziger

2 records

Duealpivu

Active

Calibrachoa Cerv. · Calibrachoa

Tobias Dümmen

2 records

Coral Reef

Active

Hylotelephium spectabile (Boreau) H. Ohba · Ice plant

Hubertus Gerardus Oudshoorn

2 records

Bonbrapi

Active

Brachyscome formosa

Bernuetz Andrew

2 records

Diastonia

Terminated

Diascia Link & Otto · Twinspur

Syngenta Seeds B.V.

2 records

Blackbeard

Active

Penstemon digitalis Nutt. ex Sims

Hansen Hans A

4 records

Cope Scarfir

Terminated

hybrids between Pelargonium peltatum and Pelargonium zonale · Ivy-leaved geranium

Mitchell Eugene Hanes

2 records

Balyricsil

Terminated

Salvia x sylvestris L. · Wood sage

PAN AMERICAN SEED CO

2 records

Cante Pinka

Terminated

Pelargonium zonale (L.) L'Her. ex Aiton x P. tongaense Vorster

Mitchell Eu. Hanes Goldsmith Seeds Inc.

2 records

Arkpap

Active

Olearia phlogopappa (Labill.) DC. · Tasmanian daisybush

County Park Nursery Ltd.

2 records

Balumotink

Application submitted

Calibrachoa Cerv. · Calibrachoa

LAURA MASOR

2 records

16EUPD1

Active

Euphorbia hypericifolia L. · Graceful sandmat

van Staalduinen Eliza

2 records

Bombay Fiora

Terminated

Celosia L. · Cockscomb

MAURITS PETRUS H.

2 records

Berose

Terminated

Begonia Semperflorens-Cultorum Group · Bedding Begonia

Syngenta Seeds B.V.

2 records

Balavurlu

Active

Lavandula angustifolia Mill. · English lavender

Martijn Baijens

2 records

Anpinkim

Active

Angelonia angustifolia Benth. · Angelonia

Martin Geibel

2 records

11LI

Active

Lagerstroemia indica L. · Crape myrtle

James Berry

2 records

Zehavit

Active

Cicer arietinum L. · Chickpea

Moshe Zalsman

GR UA
2 records

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