Variety traits
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.
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.
Pelargonium zonale (L.) L'Hér. · Horseshoe pelargonium
Michalik Andrea|Dresden, DE
Phaseolus vulgaris L. · Common bean
W BROTHERTON SEED CO INC
Phaseolus vulgaris L. · Common bean
W BROTHERTON SEED CO INC
Vitis vinifera L. · Common grape vine
Vivai Cooperativi Rauscedo, I
Rosa L. · Rose
Meilland International S.A.
Scaevola aemula R. Br. · Fairy fan-flower
Mirza Mohammed Shoaib^^^Andrew Bernuetz
Cucumis sativus L. · Cucumber
Zoldesegtermesztesi Kutato Intezet RT (HU)
Brassica oleracea L. (Cauliflower Group) · Cauliflower
Bejo Zaden BV (NL)
Triticum aestivum L. · Bread wheat
SECOBRA RECHERCHES S.A.S
Pisum sativum L. · Pea
Semenarna Ljubljana, SI
Brassica oleracea L. (Cauliflower Group) · Cauliflower
MORAVOSEED
Brassica oleracea L. (Cauliflower Group) · Cauliflower
TOMOAKI FUNABIKI
Pisum sativum L. · Pea
Domaine Public (FR)
Helianthus annuus L. · Sunflower
SYNGENTA FRANCE S.A.S.
Brassica oleracea L. (Cauliflower Group) · Cauliflower
Remi Leviel
Lactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel BV (NL)
Cucumis sativus L. · Cucumber
VEGETABLE MONSANTO B.V.
Phaseolus vulgaris L. · Common bean
Syngenta Seeds
Brassica oleracea L. (Broccoli Group) · Broccoli
Xiaoquanq Liang
Lactuca sativa L. · Lettuce
HM.CLAUSE
Brassica oleracea L. (Cauliflower Group) · Cauliflower
VEGETABLE MONSANTO B.V.
Brassica oleracea L. (Cauliflower Group) · Cauliflower
Hazera Seeds, NL
Lactuca sativa L. · Lettuce
Steven Mitchell, Daniel Trimboli, Enza Zaden Australia Pty Ltd
Lolium perenne L. · Perennial ryegrass
TURF-SEED INC