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.
Cucumis sativus L. · Cucumber
RIJK ZWAAN ZAADTEELT EN ZAADHANDEL B.V.
Phaseolus vulgaris L. · Common bean
Pop Vriend, NL
Alstroemeria L. · Alstroemeria
van Zanten Plants b.v
Alstroemeria L. · Alstroemeria
Konst Breeding B.V.
Solanum tuberosum L. · Potato
DOUGLAS HARLEY
Festuca arundinacea Schreb. · Tall fescue
Oregro Seeds
Brassica oleracea L. (Cauliflower Group) · Cauliflower
VEGETABLE MONSANTO B.V.
Helianthus annuus L. · Sunflower
Frantz Boudet
Lactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Lactuca sativa L. · Lettuce
VILMORIN, S.A.
Lactuca sativa L. · Lettuce
VILMORIN, S.A.
Helianthus annuus L. · Sunflower
Pioneer Overseas Corporation, USA
Zea mays L. subsp. mays (Sweet Corn Group) · Sweet corn
Pop Vriend, NL
Prunus avium (L.) L. · Sweet cherry
UNIVERSITY OF CALIFORNIA (US)
Rosa L. · Rose
Weeks Wholesale Rose Grower Inc.
Solanum tuberosum L. · Potato
Kweek- en Researchbedrijf Agrico B.V.
Phaseolus vulgaris L. · Common bean
Syngenta, NL
Festuca arundinacea Schreb. · Tall fescue
Beat Boller (CH)
Brassica rapa L. subsp. pekinensis (Lour.) Hanelt · Napa cabbage
SSC JP
Spinacia oleracea L. · Spinach
Rene van Meijel
Brassica oleracea L. (Broccoli Group) · Broccoli
Xiaoquanq Liang
Festuca arundinacea Schreb. · Tall fescue
R.V. FRAKES AND J.R. COWAN
Brassica oleracea L. (Cauliflower Group) · Cauliflower
Bejo Zaden, NL
Solanum tuberosum L. · Potato
Wolfgang Walter