In a new study, the effect of heat on rose flowers was examined by measuring flower size in 10 diploid rose populations created by crossing the heat-tolerant Texas A&M University (TAMU) breeding lines (M4-4, J06-20-14-3) and sensitive (97/7-2, ‘Red Fairy’, ‘Sweet Chariot’, ‘Vineyard Song’, ‘Old Blush’, and ‘Little Chief’) diploid roses.
As expected, the populations and individual seedlings differed in flower size. The heat-shock treatment (1 hour at 44 °C) decreased flower diameter (15.7%), petal number (23.3%), and flower dry weight (16.9%). Flower-size traits had moderately low narrow-sense (0.24, 0.12, and 0.34 for flower diameter, petal number, and flower dry weight, respectively) and moderately high broad-sense (0.62, 0.74, and 0.76 for flower diameter, petal number, and flower dry weight, respectively) heritability indicating important nonadditive genetic effects.
If rose genotypes vary in floral heat tolerance, a differential response to heat among populations, seedlings, or both detected statistically by a significant interaction effect would be expected. Both the analysis of variance (ANOVA) and the restricted estimated maximum likelihood (REML) analyses showed a positive population × heat stress interaction effect for flower diameter.
Although the data indicate differences in floral heat tolerance among the populations and genotypes, the effect was small as compared with the other sources of variation. Thus, using this 1-hour heat-shock approach would not be an effective strategy to select for floral heat tolerance in rose.
Access the full study at HortScience
Announcements
Vacancies
- Technical Sales Representative, Leamington, Ontario
- Technical Sales Representative, Ancaster, Ontario
- HR Generalist
- Head Grower Strawberries (West Virginia USA)
- Global Sourcing Manager
- Buying Operations Manager (BOM Process)
- Sourcing Manager EU
- Manager Operations Ethiopia
- Manager Operations Ethiopia
- Senior Grower
"Tweeting Growers"
Top 5 - yesterday
- “With our placement in Türkiye, we have easy access to the rest of the world”
- Dutch growers lose faith
- Australia: Ball Mother-stock House meets growing demands
- "When buying our products, not only the rose production will be supported, also the well-being of rescued wildlife"
- "New substrate fiber fits into the future of cultivation"
Top 5 - last week
Top 5 - last month
- Hasfarm’s network expands in Indonesia, partnering with Bromelia Flowers and Tropika
- "Breeders need to study the Chinese market carefully before introducing a variety"
- Royal Flowers merges with The Elite Group
- North America: “Unbridled optimism for Mother’s Day tempered by reality”
- “A new sales channel for flower companies without any labor or high fixed costs”
Receive the daily newsletter in your email for free | Click here
Other news in this sector:
- 2023-06-02 Takii unveils new seed production location in Karacabey, Turkey
- 2023-05-31 HilverdaFlorist launches new catalog for 2024
- 2023-05-30 Six candidates competing for FleuroStar
- 2023-05-30 India: Commercial tissue culture facility inaugurated at Punjab Ag University
- 2023-05-26 Space seeds are sprouting
- 2023-05-23 US: Proven Winners ColorChoice roses continue to earn top marks in trials
- 2023-05-23 “Growers no longer have to wait to see what a plant will do”
- 2023-05-15 "Breeders need to study the Chinese market carefully before introducing a variety"
- 2023-05-11 "We have earned our 75+ years of experience through the same values we still have today"
- 2023-05-09 Syngenta appoints new business manager for expanding Ornamentals team
- 2023-05-09 Efforts to strengthen the system for breeders rights protection in Mexico
- 2023-05-08 MNP / Suntory launches (how it's made) explanation video
- 2023-05-05 Sakata releases new Dania and Danique series
- 2023-05-03 Revisit the California Spring Trials displays of Ball Horticultural Company with virtual tour
- 2023-05-02 Proven Winners announces 2024 new varieties
- 2023-05-02 Dutch Spring Trials are on
- 2023-05-01 Interplant Roses organizes Rose Inspiration Days
- 2023-04-28 Austrian Parliament amends seed patent law
- 2023-04-27 "New location and new concept"
- 2023-04-25 Arun Sharma joins Benary as Global Head of Breeding
