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.
Brassica oleracea L. (Cauliflower Group) · Cauliflower
Ger Beemsterboer
Alstroemeria L. · Alstroemeria
van Zanten Plants b.v
Fragaria x ananassa Duchesne ex Rozier · Garden strawberry
Fresh Forward Holding BV, Netherlands
Cucumis sativus L. · Cucumber
Nunhems, NL
Festuca arundinacea Schreb. · Tall fescue
Pickseed USA, Inc. & Rutgers, The State University of New Jersey
Pisum sativum L. · Pea
Syngenta Seeds B.V.
Lolium perenne L. · Perennial ryegrass
Valley Seeds Pty Ltd
Festuca arundinacea Schreb. · Tall fescue
SEED RESEARCH OF OREGON
Corylus avellana L. · Common hazel
Shawn A. Mehlenbacher, David C. Smith, Rebecca L. McCluskey
Brassica oleracea L. (Cauliflower Group) · Cauliflower
MOSKOVSKOE OTDELENIE VNIIR (MOVIR)
Euphorbia pulcherrima Willd. ex Klotzsch · Poinsettia
Marinus Jacob Bevelander
Rosa L. · Rose
Samuel McGredy
Brassica oleracea L. (White Cabbage Group) · White cabbage
BEJO ZADEN B.V, NL
Festuca arundinacea Schreb. · Tall fescue
Grasslands Innovation Ltd
Lolium perenne L. · Perennial ryegrass
PURE SEED TESTING
Lolium perenne L. · Perennial ryegrass
PURE SEED TESTING
Lolium perenne L. · Perennial ryegrass
Peak Plant Genetics, LLC & Rutgers, The State University of New Jersey
Alstroemeria L. · Alstroemeria
van Zanten Plants b.v
Ipomoea batatas (L.) Lam. · Sweet potato
Pecota Kenneth|Raleigh, NC / Yencho G. Craig|Washington, NC / Pierce Cynthia|Clayton, NC
Ipomoea batatas (L.) Lam. · Sweet potato
Pecota Kenneth|Raleigh, NC / Yencho G. Craig|Washington, NC / Pierce Cynthia|Clayton, NC
Argyranthemum frutescens (L.) Sch. Bip. · Marguerite daisy
University of Sydney
Alstroemeria L. · Alstroemeria
Tas Marius
Calibrachoa Cerv. · Calibrachoa
Yasuyuki Murakami
Mandevilla Lindl. · Mandevilla
Tachibana, R.