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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.

Lanconnecticut

Active

Mandevilla sanderi (Hemsl.) Woodson · Brazilian jasmine

Lannes Robert

2 records

Kiegalyel

Active

Gaillardia aristata Pursh · Blanketflower

Moonen Carla M.|Enkhuizen, NL

2 records

KLESG16007

Terminated

Jamesbrittenia grandiflora (Galpin) Hilliard

Nils Klemm^^^Katinka Wilde

2 records

Korcatemp

Active

Rosa L. · Rose

Wilhelm Kordes,Tim-Hermann Kordes,Margarita Kordes

2 records

Impacora

Terminated

Impatiens New Guinea Group · New Guinea Impatiens

Elke Steffen

2 records

KLECA21566

Active

Calibrachoa Cerv. · Calibrachoa

Angelo Carrella

2 records

KLELV16119

Active

Lavandula angustifolia Mill. · English lavender

Ruijun Li

2 records

KLEDP06080

Active

Dianthus L. · Carnation

Nils Klemm

2 records

Kerbelchamp

Active

Primula vulgaris Huds. · Primrose

Priscilla Grace Kerley, David William Kerley, Timothy Edward Kerley

2 records

KLECA18483

Active

Calibrachoa Cerv. · Calibrachoa

Klemm Nils / Stover Anita

2 records

Kerprilcomp

Active

Petunia Juss. · Petunia

Priscilla Grace Kerley, David William Kerley

2 records

Georgie White

Active

Diplacus aurantiacus (Curtis) Jeps. · Bush monkeyflower

Trees Scott C

2 records

Kerprilpro

Active

Petunia x atkinsiana D. Don · Garden petunia

Timothy Edward Kerley^^^Sarah Elisabeth Kerley^^^David William Kerley^^^Priscilla Grace Kerley

2 records

FLOGB0060

Active

Gaillardia aristata Pursh · Blanketflower

Loonen Rik Petrus Louis

2 records

INNEMLITCO

Active

Nemesia Vent. · Nemesia

Silvia Hofmann

2 records

Georgie Red

Active

Diplacus aurantiacus (Curtis) Jeps. · Bush monkeyflower

Trees Scott C

2 records

Glen Doll

Active

Rubus idaeus L. · Red raspberry

The James Hutton Institute, Dundee, DD2 5DA

3 records

Gelato Pineapple

Active

Osteospermum L. · Osteospermum

Decock Youngplants S.P.R.L.

2 records

Heatwave Glimmer

Active

Salvia xjamensis J. Crompton · Jame sage

Plant Growers Australia Pty Ltd

2 records

Duesalaspla

Active

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

Tobias Dümmen

2 records

Filiresta

Active

Cordyline australis (G. Forst.) Endl. · Cabbage tree

Fitzgerald Pat

2 records

Hamspirit

Active

Dahlia Cav. · Dahlia

Keith R.W. Hammett

2 records

Golden Stardust

Active

Coreopsis grandiflora Hogg ex Sweet · Large-flowered tickseed

Blair Winner

2 records

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