Abstract
Abstract In two consecutive seasons, forage rape ( Brassica napus L.) plants were exposed to short periods (240°C hr) of heat stress (30°C day/25°C night) during seed filling (80% seed moisture content = S1), at physiological maturity (50% seed moisture content = S2) and at both S1 plus S2 (=S3) in a Biotron before being returned to the field until seed harvest. Seeds were hand harvested at 14% seed moisture content and their quality assessed by measuring germination, seed vigour (using the accelerated ageing and conductivity tests) and seed mass (as determined by thousand seed weight). Heat stress at both S1 and S2 caused a small (<10%) but significant reduction in germination in both seasons. There was a significant heat stress timing interaction in the first but not the second season. Reductions in germination were a result of increased abnormal seedling production not seed death. All three heat stress treatments significantly reduced seed vigour, with S3>S2>S1. Seed mass was reduced by heat stress at S1 but not at S2. Variable seed vigour in high‐germinating New Zealand‐produced forage rapeseed lots is most likely explained by short periods of heat stress during seed development.
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Claims 6
Claim · model-written summary
Heat at both S1 and S2 slightly but significantly reduced germination in both seasons.
- Taxon
- forage rapee1
- Treatment
- Heat stress at both S1 and S2e0
- Outcome
- germinatione0
- Direction
- reductione0
- Value
- <10%e0
Not reportedComparator
Verbatim
e0“Heat stress at both S1 and S2 caused a small (<10%) but significant reduction in germination in both seasons”
e1“forage rape ( Brassica napus L.)”
Claim · model-written summary
Heat stress timing interacted significantly with germination in the first season only.
Verbatim
e0“There was a significant heat stress timing interaction in the first but not the second season”
e1“forage rape ( Brassica napus L.)”
Claim · model-written summary
Germination reductions reflected more abnormal seedlings rather than seed death.
Verbatim
e0“Reductions in germination were a result of increased abnormal seedling production not seed death”
e1“forage rape ( Brassica napus L.)”
Claim · model-written summary
All three heat treatments significantly reduced seed vigour, strongest at S3.
- Taxon
- forage rapee1
- Treatment
- All three heat stress treatmentse0
- Outcome
- seed vigoure0
- Direction
- reducede0
- Qualifier
- S3>S2>S1e0
Not reportedComparator
Verbatim
e0“All three heat stress treatments significantly reduced seed vigour, with S3>S2>S1”
e1“forage rape ( Brassica napus L.)”
Claim · model-written summary
Heat at S1 reduced seed mass.
Not reportedComparator
Verbatim
e0“Seed mass was reduced by heat stress at S1 but not at S2”
e1“forage rape ( Brassica napus L.)”
Claim · model-written summary
Heat at S2 did not reduce seed mass.
Not reportedComparator
Verbatim
e0“Seed mass was reduced by heat stress at S1 but not at S2”
e1“forage rape ( Brassica napus L.)”
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