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.

Damascus F1

Terminated

Allium cepa L. · Onion

Scott Hendricks

2 records

Belli

Active

Anethum graveolens L. · Dill

Khrapatyi Ihor Vasylovych

2 records

Barberia

Terminated

Lolium multiflorum Lam. ssp. italicum (A. Br.) Volkart · Italian ryegrass

Barenbrug Holland BV (NL)

1 record

Bante Cheriasun

Terminated

Lantana L. · Lantana

Shifeng Pan c/o Goldsmith Seeds, Inc.

1 record

Baro Star

Active

Brassica oleracea L. (Broccoli Group) · Broccoli

Jong-Sup Shin

2 records

AS Viserina

Active

Zea mays L. · Maize

TOV "AHRO SEME"

2 records

AMERICANA SCARLET

Terminated

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

GOLDSMITH SEEDS

1 record

AMERICANA ROSE

Terminated

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

GOLDSMITH SEEDS

1 record

Aisha F1

Terminated

Solanum lycopersicum L. · Tomato

Aikhan Eihin

1 record

Amigo

Active

Brassica oleracea L. (Cauliflower Group) · Cauliflower

ISI SEMENTI SPA

1 record

Aida F1

Active

Solanum lycopersicum L. · Tomato

Anzhelika Rakov

1 record

Abbotsvud

Terminated

Potentilla L. · Cinquefoil

Alieksieienko Oksana Volodymyrivna, Vol`s`ka IUliana Oleksandrivna,

1 record

8Kh288KPDM

Terminated

Helianthus annuus L. · Sunflower

Steve Thompson

2 records

YAGANCE

Terminated

Begonia boliviensis A. DC. · Bolivian begonia

A T Yates & Son

1 record

YUASPGIO

Application submitted

Asplenium antiquum Makino

Xianyu Yunquan^^^Huang Ziwen

2 records

Zalsasimb

Terminated

Alstroemeria L. · Alstroemeria

Van Zanten Breeding B.V.

1 record

YANOON 6

Withdrawn

Actinidia chinensis Planch. · Kiwifruit

Changsha Yanoon BioTech Co. Ltd.

1 record

Adeline

Active

Solanum lycopersicum L. · Tomato

HM Clause SA (FR)

1 record

White Fan

Withdrawn

Scaevola aemula R. Br. · Fairy fan-flower

Outback Plants Pty Ltd.

1 record

Valborg

Terminated

Salix L. · Willow

Stig Larsson

1 record

TL993

Active

Hybrids between Salvia guaranitica and S. splendens

TAKII & CO LTD

1 record

Tango

Active

Humulus lupulus L. · Common hop

Anton Lutz

1 record

Supreme Canteloupe

Active

Hybrids between Echinacea purpurea (L.) Moench and Echinacea paradoxa (Norton) Britton

HARINI KORLIPARA

1 record

Tesval

Active

Alstroemeria L. · Alstroemeria

Horti Partners V.O.F.

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.