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.

Camdared

Active

Pelargonium grandiflorum (Andrews) Willd. · Regal pelargonium

Michalik Andrea|Dresden, DE

3 records

Bottle Rocket

Active

Ligularia Cass. · Golden Ray

Walters Gardens Inc

3 records

Balcaborim

Active

Calibrachoa Cerv. · Calibrachoa

Winslow Benjamin K. / Masor Laura L.

3 records

Balyriclu

Active

Salvia x sylvestris L. · Wood sage

PAN AMERICAN SEED CO

3 records

Baluptgonz

Active

Coreopsis L. · Tickseed

Winner Blair

3 records

Balcelbrisal

Terminated

Impatiens New Guinea Group · New Guinea Impatiens

KERRY MEYER STROPE

3 records

BKPBEWFEP

Active

Begonia boliviensis A. DC. · Bolivian begonia

Beekenkamp Annie Cornelia

3 records

BLAPINK

Active

Daphne x transatlantica C. D. Brickell & A. R. White

ANTHONY ROBIN WHITE|SUSAN BARBARA WHITE

3 records

Amore Rose

Active

Dicentra Bernh. · Bleeding heart

Korlipara Harini

5 records

Balcobees

Active

Petunia Juss. · Petunia

JIANPING REN|ROBERT B.EISENREICH

3 records

Zernoslav

Active

Zea mays L. · Maize

OOO NAUCHNO-PROIZVODSTVENNAYA KOMMERCHESKAYA FIRMA «SELEKTA»

4 records

Kebeos

Active

Zea mays L. · Maize

KWS SAAT SE & CO.KGAA

5 records

DB Lada

Active

Zea mays L. · Maize

RUP «NAUCHNO - PRAKTICHESKIJ CZENTR NAN BELARUSI PO ZEMLEDELIYU» RUP «POLESSKIJ INSTITUT RASTENIEVODSTVA» GU "INSTITUT ZERNOVYX KULTUR NACZIONALNOJ AKADEMII AGRARNYX NAUK UKRAINY" CHASTNOE SELSKOXOZYAJSTVENNOE PREDPRIYATIE AGROFIRMA "UROZHAJ"

4 records

Tintoretto

Application submitted

Beta vulgaris Garden Beet Group · Garden beet

CORA SEEDS

CY PL

2 records

Elbtal

Active

Hydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea

Silke TIPPMANN (DE)

DK FR

3 records

Blonde à carde blanche

Terminated

Beta vulgaris Leaf Beet Group · Swiss chard

GSN Semences (FR)

FR HR

2 records

Sunman

Application submitted

Brassica oleracea L. (Broccoli Group) · Broccoli

Syngenta Crop Protection AG

3 records

Hiljwlsdaca

Active

Helleborus x sahinii Grimshaw

HilverdaKooij B.V

2 records

Bozhrug755

Active

Rosa L. · Rose

Pheno Geno Rose D.O.O.

2 records

Zlatoglava

Active

Triticum aestivum L. · Bread wheat

Zinkovs`ka Inna Oleksandrivna, Kosov Anatolii Hryhorovych, Kraievs`kyi Anatolii Mykolaiovych, Karpenko Oleksandr Oleksandrovych,

3 records

Werre

Active

Brassica oleracea L. (Kohlrabi Group) · Kohlrabi

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

2 records

Victoria

Active

Brassica oleracea L. (White Cabbage Group) · White cabbage

Wing Seed

3 records

Vidpovid odeska

Active

Triticum aestivum L. · Bread wheat

Parfent`iev Mykhailo Hryhorovych, Khodakova Tetiana Mykolaivna,

3 records

Vahoma

Active

Triticum aestivum L. · Bread wheat

Babaiants Olha Vadymivna, Rodenko Halyna Anatoliivna, Fedchenko Volodymyr Pavlovych, Bosakovska Nataliia IUriivna, Shpykuliak IEvhenii Anatoliiovych, Narhan Tetiana Pavlivna, Nakonechnyi Mykola IUriiovych, Yeryniak Mykola Ivanovych, Lyfenko Savelii Pylypo

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.