Abstract
Abstract Transient daily heat stress during flowering of canola ( Brassica napus L.) as a result of global warming is an increasing threat to grain production in this important oilseed crop. We investigated the intensity and duration of transient daily heat stress treatment at different stages of reproductive development in three B. napus genotypes under controlled environment conditions. Heat stress treatments during the week before first open flower on the main stem (S0) or during the first week (S1) or second week (S2) following first open flower greatly reduced pod number and seed yield on the main stem. Heat stress treatment during the third week (S3), fourth week (S4), or fifth week (S5) reduced seed yield more on the branches and less on the main stem as time progressed. Pod number and seed yield were reduced by moderate heat stress (TC2; 32°C/22°C) and high heat stress (TC3; 35°C/25°C), compared with the control (TC1, 25°C/15°C). Each duration of heat stress treatment (3, 5 or 7 days) caused the same reduction in pod number and seed per pod on the main stem. Leaf stomatal conductance, leaf chlorophyll index, plant height, and dry weight of above‐ground biomass increased from TC1 to TC3, which indicates that heat stress in the absence of drought stress does not inhibit vegetative growth. Cool night temperatures (15°C) resulted in recovery of pod number and seed yield after moderate (32°C) but not high (35°C) daily transient heat stress. The range of genotype responses to heat stress was greater under TC2 than under TC3. This research brings forward the critical period for heat stress sensitivity in B. napus to one week before first open flower and defines the conditions for controlled environment screening for heat tolerance in B. napus .
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Claims 15
Claim · model-written summary
Heat stress during the week before first open flower reduced pod number and seed yield on the main stem.
- Taxon
- B. napus
_Brassica_napus_-_Habit.jpg?width=60)
Brassica napuse0 - Treatment
- Heat stress treatments during the week before first open flower on the main stem (S0)e1
- Outcome
- pod number and seed yielde1
- Direction
- reducede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Brassica_napus_-_Habit.jpg?width=500)
Verbatim
e0“in three B. napus genotypes under controlled environment conditions”
e1“Heat stress treatments during the week before first open flower on the main stem (S0) or during the first week (S1) or second week (S2) following first open flower greatly reduced pod number and seed yield on the main stem”
Claim · model-written summary
Heat stress during the first week after first open flower (S1) reduced pod number and seed yield on the main stem.
- Taxon
- B. napusBrassica napuse0
- Treatment
- during the first week (S1)e1
- Outcome
- pod number and seed yielde1
- Direction
- reducede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in three B. napus genotypes under controlled environment conditions”
e1“Heat stress treatments during the week before first open flower on the main stem (S0) or during the first week (S1) or second week (S2) following first open flower greatly reduced pod number and seed yield on the main stem”
Claim · model-written summary
Heat stress during the second week after first open flower (S2) reduced pod number and seed yield on the main stem.
- Taxon
- B. napusBrassica napuse0
- Treatment
- second week (S2) following first open flowere1
- Outcome
- pod number and seed yielde1
- Direction
- reducede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in three B. napus genotypes under controlled environment conditions”
e1“Heat stress treatments during the week before first open flower on the main stem (S0) or during the first week (S1) or second week (S2) following first open flower greatly reduced pod number and seed yield on the main stem”
Claim · model-written summary
Heat stress during the third to fifth weeks (S3 to S5) reduced seed yield, more on the branches and less on the main stem as time progressed.
- Taxon
- B. napusBrassica napuse0
- Treatment
- Heat stress treatment during the third week (S3), fourth week (S4), or fifth week (S5)e2
- Outcome
- seed yielde2
- Direction
- reducede2
- Qualifier
- more on the branches and less on the main stem as time progressede2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in three B. napus genotypes under controlled environment conditions”
e2“Heat stress treatment during the third week (S3), fourth week (S4), or fifth week (S5) reduced seed yield more on the branches and less on the main stem as time progressed”
Claim · model-written summary
Moderate heat stress (TC2) reduced pod number and seed yield compared with the control (TC1).
- Taxon
- B. napusBrassica napuse0
- Treatment
- moderate heat stress (TC2; 32°C/22°C)e3
- Outcome
- pod number and seed yielde3
- Direction
- reducede3
- Comparator
- control (TC1, 25°C/15°C)e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in three B. napus genotypes under controlled environment conditions”
e3“Pod number and seed yield were reduced by moderate heat stress (TC2; 32°C/22°C) and high heat stress (TC3; 35°C/25°C), compared with the control (TC1, 25°C/15°C)”
Claim · model-written summary
High heat stress (TC3) reduced pod number and seed yield compared with the control (TC1).
- Taxon
- B. napusBrassica napuse0
- Treatment
- high heat stress (TC3; 35°C/25°C)e3
- Outcome
- pod number and seed yielde3
- Direction
- reducede3
- Comparator
- control (TC1, 25°C/15°C)e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in three B. napus genotypes under controlled environment conditions”
e3“Pod number and seed yield were reduced by moderate heat stress (TC2; 32°C/22°C) and high heat stress (TC3; 35°C/25°C), compared with the control (TC1, 25°C/15°C)”
Claim · model-written summary
Each heat stress duration of 3, 5 or 7 days caused the same reduction in pod number and seed per pod on the main stem.
- Taxon
- B. napusBrassica napuse0
- Treatment
- Each duration of heat stress treatment (3, 5 or 7 days)e4
- Outcome
- pod number and seed per pode4
- Direction
- reductione4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in three B. napus genotypes under controlled environment conditions”
e4“Each duration of heat stress treatment (3, 5 or 7 days) caused the same reduction in pod number and seed per pod on the main stem”
Claim · model-written summary
High heat stress (TC3) increased leaf stomatal conductance and leaf chlorophyll index relative to the control (TC1).
- Taxon
- B. napusBrassica napuse0
- Treatment
- TC3e5
- Outcome
- Leaf stomatal conductance, leaf chlorophyll indexe5
- Direction
- increasede5
- Comparator
- TC1e5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in three B. napus genotypes under controlled environment conditions”
e5“Leaf stomatal conductance, leaf chlorophyll index, plant height, and dry weight of above‐ground biomass increased from TC1 to TC3”
Claim · model-written summary
High heat stress (TC3) increased plant height and dry weight of above‐ground biomass relative to the control (TC1).
- Taxon
- B. napusBrassica napuse0
- Treatment
- TC3e5
- Outcome
- plant height, and dry weight of above‐ground biomasse5
- Direction
- increasede5
- Comparator
- TC1e5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in three B. napus genotypes under controlled environment conditions”
e5“Leaf stomatal conductance, leaf chlorophyll index, plant height, and dry weight of above‐ground biomass increased from TC1 to TC3”
Claim · model-written summary
Heat stress without drought stress did not inhibit vegetative growth of B. napus.
- Taxon
- B. napusBrassica napuse0
- Treatment
- heat stress in the absence of drought stresse6
- Outcome
- vegetative growthe6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in three B. napus genotypes under controlled environment conditions”
e6“which indicates that heat stress in the absence of drought stress does not inhibit vegetative growth”
Claim · model-written summary
Cool night temperatures (15°C) resulted in recovery of pod number and seed yield after moderate heat stress (32°C).
- Taxon
- B. napusBrassica napuse0
- Treatment
- Cool night temperatures (15°C)e7
- Outcome
- recovery of pod number and seed yielde7
- Qualifier
- after moderate (32°C)e7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in three B. napus genotypes under controlled environment conditions”
e7“Cool night temperatures (15°C) resulted in recovery of pod number and seed yield after moderate (32°C) but not high (35°C) daily transient heat stress”
Claim · model-written summary
Cool night temperatures (15°C) did not resulting in recovery of pod number and seed yield after high heat stress (35°C).
- Taxon
- B. napusBrassica napuse0
- Treatment
- Cool night temperatures (15°C)e7
- Outcome
- recovery of pod number and seed yielde7
- Qualifier
- not high (35°C)e7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in three B. napus genotypes under controlled environment conditions”
e7“Cool night temperatures (15°C) resulted in recovery of pod number and seed yield after moderate (32°C) but not high (35°C) daily transient heat stress”
Claim · model-written summary
The range of genotype responses to heat stress was greater under TC2 than under TC3.
- Taxon
- B. napusBrassica napuse0
- Treatment
- TC2e1
- Outcome
- range of genotype responses to heat stresse1
- Direction
- greatere1
- Comparator
- TC3e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in three B. napus genotypes under controlled environment conditions”
e1“The range of genotype responses to heat stress was greater under TC2 than under TC3”
Claim · model-written summary
The critical period for heat stress sensitivity in B. napus is one week before first open flower.
- Taxon
- B. napusBrassica napuse2
- Organ / stage
- one week before first open flowere2
- Outcome
- critical period for heat stress sensitivitye2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“This research brings forward the critical period for heat stress sensitivity in B. napus to one week before first open flower”
Claim · model-written summary
The study defines conditions for controlled environment screening for heat tolerance in B. napus.
- Taxon
- B. napusBrassica napuse1
- Outcome
- conditions for controlled environment screening for heat tolerancee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“defines the conditions for controlled environment screening for heat tolerance in B. napus”
The same questions in other papers
heat · yield · Brassica napus (oilseed rape)Positive and negative results
18 papers in the same direction as this paper · 3 in the opposite direction
- positive
- negative
- negative
18 papers more in this group
See all 22 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.