Abstract
Oilseed rape (Brassica napus L.), also known as canola, is particularly sensitive to high temperatures during flowering. However, the impacts of heat stress during male and female gametophyte development, several days before anthesis and fertilisation, remain unclear. In this study we selected two cultivars, AV-Ruby and YM11, which exhibited different responses to heat stress in a previous study. Precise transient heat stress (maximum 32 ℃ day /22 ℃ night) or control (maximum 25 ℃ day /15 ℃ night) treatments were applied to evaluate the impact of heat stress during male and female gametophyte development on subsequent floret fecundity after pollination. We measured floret fecundity by pod set, number of seeds per pod and average seed size. Heat stress during male gametophyte development reduced pollen viability and germination rate, and resulted in fewer pods and seeds per pod on the main stem. However, despite these negative impacts, pollen tubes successfully traversed the style and were visible at a high percentage of ovules in both heat stress and control treatments. When heat stress was applied to the female gametophyte in the first five buds on the main stem, subsequent floret fecundity was reduced in the lower main stem, while florets in the upper main stem exhibited higher fecundity than in the control treatment. Heat stress during sporogenesis and/or gametogenesis in male and female organs across two cultivars had a lasting negative impact on subsequent floret fecundity, observed as a reduction in the number of pods and seeds per pod, but had no impact on average seed size.
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Claims 7
Claim · model-written summary
Heat stress during male gametophyte development reduced pollen viability and germination rate in Brassica napus.
- Taxon
- Brassica napus
_Brassica_napus_-_Habit.jpg?width=60)
Brassica napust0 - Treatment
- Heat stress during male gametophyte developmente0
- Outcome
- pollen viability and germination ratee0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Brassica_napus_-_Habit.jpg?width=500)
Verbatim
e0“Heat stress during male gametophyte development reduced pollen viability and germination rate, and resulted in fewer pods and seeds per pod on the main stem”
t0“Brassica napus”
Claim · model-written summary
Heat stress during male gametophyte development resulted in fewer pods and seeds per pod on the main stem of Brassica napus.
- Taxon
- Brassica napusBrassica napust0
- Organ / stage
- main steme0
- Treatment
- Heat stress during male gametophyte developmente0
- Outcome
- pods and seeds per pode0
- Direction
- fewere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Heat stress during male gametophyte development reduced pollen viability and germination rate, and resulted in fewer pods and seeds per pod on the main stem”
t0“Brassica napus”
Claim · model-written summary
Pollen tubes successfully traversed the style and were visible at a high percentage of ovules in both heat stress and control treatments.
- Taxon
- Brassica napusBrassica napust0
- Organ / stage
- stylee0
- Treatment
- heat stresse0
- Outcome
- pollen tubes successfully traversed the stylee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“pollen tubes successfully traversed the style and were visible at a high percentage of ovules in both heat stress and control treatments”
t0“Brassica napus”
Claim · model-written summary
Heat stress applied to the female gametophyte in the first five buds reduced subsequent floret fecundity in the lower main stem.
- Taxon
- Brassica napusBrassica napust0
- Organ / stage
- lower main steme0
- Treatment
- heat stress was applied to the female gametophytee0
- Outcome
- floret fecunditye0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When heat stress was applied to the female gametophyte in the first five buds on the main stem, subsequent floret fecundity was reduced in the lower main stem, while florets in the upper main stem exhibited higher fecundity than in the control treatment”
t0“Brassica napus”
Claim · model-written summary
After heat stress applied to the female gametophyte, florets in the upper main stem exhibited higher fecundity than in the control treatment.
- Taxon
- Brassica napusBrassica napust0
- Organ / stage
- upper main steme0
- Treatment
- heat stress was applied to the female gametophytee0
- Outcome
- fecunditye0
- Direction
- highere0
- Comparator
- control treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When heat stress was applied to the female gametophyte in the first five buds on the main stem, subsequent floret fecundity was reduced in the lower main stem, while florets in the upper main stem exhibited higher fecundity than in the control treatment”
t0“Brassica napus”
Claim · model-written summary
Heat stress during sporogenesis and/or gametogenesis in male and female organs across two cultivars reduced the number of pods and seeds per pod.
- Taxon
- Brassica napusBrassica napust0
- Treatment
- Heat stress during sporogenesis and/or gametogenesise0
- Outcome
- number of pods and seeds per pode0
- Direction
- reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Heat stress during sporogenesis and/or gametogenesis in male and female organs across two cultivars had a lasting negative impact on subsequent floret fecundity, observed as a reduction in the number of pods and seeds per pod, but had no impact on average seed size”
t0“Brassica napus”
Claim · model-written summary
Heat stress during sporogenesis and/or gametogenesis had no impact on average seed size.
- Taxon
- Brassica napusBrassica napust0
- Treatment
- Heat stress during sporogenesis and/or gametogenesise0
- Outcome
- average seed sizee0
- Direction
- no impacte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Heat stress during sporogenesis and/or gametogenesis in male and female organs across two cultivars had a lasting negative impact on subsequent floret fecundity, observed as a reduction in the number of pods and seeds per pod, but had no impact on average seed size”
t0“Brassica napus”
The same questions in other papers
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18 papers in the same direction as this paper · 3 in the opposite direction
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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.