Abstract
Heat stress can frequently limit the yield of Brassica napus L. grown in Canada because of the often unavoidable concurrence of high temperatures and flowering. Ten B. napus inbred genotypes, an open-pollinated B. napus commercial cultivar and a B. juncea genotype were grown in a greenhouse and subjected to two temperature regimes in a growth chamber for 14 days during flowering: control 22°C/10°C and high 31°C/14°C (day/night). Floral buds were sampled at the end of the 14-day treatments, and an untargeted metabolomic assessment was completed using gas chromatography–mass spectrometry. Flower duration, number of flowers, number of pods, biomass, number of seeds and seed weight were recorded. Yield was reduced by 55% in the heat treatment during winter and by 41% during the subsequent autumn experimental run. Of the 12 genotypes, five were classified as heat-tolerant and four as heat-susceptible based on the calculated heat susceptibility index across two experiments. In total, 25 metabolic markers were identified that discriminated between the heat-tolerant and -susceptible genotypes exposed to the heat treatment. The variation identified within this set of germplasm has provided evidence that variation exists within B. napus to enable genetic gain for heat tolerance.
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Claims 4
Claim · model-written summary
Heat treatment reduced yield by 55% in the winter experimental run relative to the control temperature regime.
- Taxon
- Brassica napus
_Brassica_napus_-_Habit.jpg?width=60)
Brassica napuse0 - Organ / stage
- floweringe4
- Treatment
- heat treatmente1
- Outcome
- Yielde1
- Direction
- reducede1
- Value
- 55%e1
- Comparator
- control 22°C/10°Ce3
- Setting
- wintere1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Brassica_napus_-_Habit.jpg?width=500)
Verbatim
e0“Heat stress can frequently limit the yield of Brassica napus L. grown in Canada”
e1“Yield was reduced by 55% in the heat treatment during winter”
e3“control 22°C/10°C and high 31°C/14°C (day/night)”
e4“subjected to two temperature regimes in a growth chamber for 14 days during flowering”
Claim · model-written summary
Of the 12 genotypes, five were classified as heat-tolerant and four as heat-susceptible based on the heat susceptibility index across two experiments.
- Taxon
- Brassica napusBrassica napuse0
- Outcome
- classified as heat-tolerante5
- Qualifier
- based on the calculated heat susceptibility index across two experimentse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Heat stress can frequently limit the yield of Brassica napus L. grown in Canada”
e5“Of the 12 genotypes, five were classified as heat-tolerant and four as heat-susceptible based on the calculated heat susceptibility index across two experiments”
Claim · model-written summary
25 metabolic markers discriminated between heat-tolerant and heat-susceptible genotypes exposed to the heat treatment.
- Taxon
- Brassica napusBrassica napuse0
- Outcome
- metabolic markerse6
- Value
- 25e6
- Qualifier
- discriminated between the heat-tolerant and -susceptible genotypes exposed to the heat treatmente6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Heat stress can frequently limit the yield of Brassica napus L. grown in Canada”
e6“In total, 25 metabolic markers were identified that discriminated between the heat-tolerant and -susceptible genotypes exposed to the heat treatment”
Claim · model-written summary
The variation identified in this germplasm indicates that genetic variation exists within B. napus for heat tolerance, enabling genetic gain.
- Taxon
- B. napusBrassica napuse7
- Outcome
- variation exists within B. napuse7
- Qualifier
- to enable genetic gain for heat tolerancee7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“The variation identified within this set of germplasm has provided evidence that variation exists within B. napus to enable genetic gain for heat tolerance”
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