Journal
JOURNAL OF AGRONOMY AND CROP SCIENCE
Volume 204, Issue 2, Pages 147-154Publisher
WILEY
DOI: 10.1111/jac.12251
Keywords
forage rape; germination; heat stress; seed mass; seed quality; seed vigour
Categories
Funding
- New Zealand Ministry of Business Innovation and Employment [LINX0803]
- New Zealand Ministry of Business, Innovation & Employment (MBIE) [LINX0803] Funding Source: New Zealand Ministry of Business, Innovation & Employment (MBIE)
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In two consecutive seasons, forage rape (Brassica napus L.) plants were exposed to short periods (240 degrees C hr) of heat stress (30 degrees C day/25 degrees 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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