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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.

Sedona

Terminated

Plectranthus scutellarioides (L.) R. Br. · Coleus

SMITH THOMAS^^^HEULITT MIKE^^^METZGER SANDY^^^Deborah Avery

2 records

SAKZIN018

Active

Zinnia x marylandica D. M. Spooner et al.

Sakata Seed Corporation (SCC)

2 records

RLH1 11P1

Active

Rhododendron L. · Azalea

Robert Harold Head^^^Lisa Jones Head

2 records

SAKZIN014

Active

Zinnia x marylandica D. M. Spooner et al.

Sakata Ornamentals Europe A/S

2 records

R7890A

Active

Lavandula angustifolia Mill. · English lavender

Martijn Baijens

2 records

ROBLEZ

Active

Rhododendron obtusum (Lindl.) Planch. · Hirado azalea

Robert Edward Lee

2 records

Rhythm and Blues

Active

Salvia guaranitica A. St.-Hil. ex Benth.

Kermit E. Carter

2 records

Prairie Sunset

Active

Heliopsis helianthoides (L.) Sweet · Oxeye sunflower

Diboll Neil Hart

2 records

Poulpah123

Active

Rosa L. · Rose

Poulsen Roser A/S

2 records

PAS1213794

Active

Lavandula angustifolia Mill. · English lavender

Martijn Baijens

2 records

PENRHUB

Withdrawn

Nemesia Vent. · Nemesia

SIDNEY JAMES JONES|DAVID JAMES JONES

2 records

Padre

Active

Chrysanthemum L. · Chrysanthemum

Pieters Plant Production B.V.B.A.

2 records

PEQZ0004

Active

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

Syngenta Flowers LLC

2 records

Now Cheesier

Active

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

HARINI KORLIPARA

2 records

Mincolem04

Active

Cotinus coggygria Scop. · European smoketree

Hortival Diffusion S.A.S.

2 records

Kleirro

Protection expired

Pelargonium L'Hér. ex Ait. · Geranium

Siegfried Klemm

2 records

Korsternfue

Active

Rosa L. · Rose

Wilhelm-Alexander Kordes, Tim-Hermann Kordes, John-Vincent Kordes

2 records

LOBZ0015

Active

Lobelia erinus L. · Edging lobelia

Syngenta Participations AG

2 records

KLEPH20580

Active

Petunia Juss. · Petunia

Antonella Capo

2 records

KLEDB11787

Active

Diascia Link & Otto · Twinspur

Katinka Wilde^^^Nils Klemm

2 records

KLECA18514

Active

Calibrachoa Cerv. · Calibrachoa

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

2 records

KLEPH11199

Active

Petunia Juss. · Petunia

ANTONELLA CAPO|NILS KLEMM

2 records

KEYFLY

Active

Abelia x grandiflora Rehder · Glossy abelia

Klemens Keysers

2 records

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