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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.

TNPENHPI

Active

Penstemon hartwegii Benth. · Hartweg's beardtongue

Janet N. Egger

1 record

TOSTC0274

Active

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

Floha V.O.F

1 record

Sunrise

Withdrawn

Cordyline Comm. ex Juss. · Palm lily

Lyder Enterprises Ltd.

1 record

Sunbelnero

Terminated

Calibrachoa Cerv. · Calibrachoa

Takeshi Kanaya

1 record

Sara

Terminated

Begonia x hiemalis Fotsch · Elatior Begonia

Pligt Professionel B.V.

1 record

SCABLHATIS

Terminated

Scaevola saligna G. Forst.

Danziger-Dan Flower Farm

1 record

Rojo Paramo

Terminated

Dahlia Cav. · Dahlia

Green Works International B.V.

1 record

RUIMVCR01A

Withdrawn

Rosa L. · Rose

De Ruiter Intellectual Property B.V.

1 record

SCHROLLA27

Active

Hydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea

Schroll Management ApS

1 record

Scabushy

Terminated

Scaevola saligna G. Forst.

Shuming Luo

1 record

Presto

Terminated

Pelargonium L'Hér. ex Ait. · Geranium

Europe Geranium Diffusion S.A.R.L.

1 record

PI16

Application submitted

Ugni molinae Turcz. · Chilean guava

Viveros Hijuelas S.A.

1 record

Podaras 4

Terminated

Buddleja L. · Buddleia

Cornell University

1 record

PAS501342

Withdrawn

Lobularia maritima (L.) Desv. · Sweet alyssum

Troy Thorup

1 record

Mardi Gras

Withdrawn

Abelia x grandiflora Rehder · Glossy abelia

Rick Crowder

1 record

Little Miss Sunshine

Active

Phedimus kamtschaticus (Fisch.) 't Hart · Orange stonecrop

Hans A. Hansen

1 record

Lena

Terminated

Euphorbia milii Des Moul. · Crown of thorns

SCHWAB-STIRNADEL MARIANNE, SCHWAB FRITZ

1 record

KLEPH22622

Active

Petunia x atkinsiana D. Don · Garden petunia

Antonella Capo

1 record

Meiperpaco

Terminated

Rosa L. · Rose

Alain Antoine Meilland

1 record

KLEPH19198

Active

Petunia Juss. · Petunia

Antonella Capo

1 record

Lannewjersey

Terminated

Mandevilla sanderi (Hemsl.) Woodson · Brazilian jasmine

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

1 record

Kolmamoer

Application submitted

Salvia xjamensis J. Crompton · Jame sage

Kolster Holding B.V.

1 record

KLECA18445

Terminated

Calibrachoa Cerv. · Calibrachoa

Klemm + Sohn GmbH & Co. KG^^^Nils Klemm^^^Anita Stöver

1 record

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