Abstract
Abstract Drying reduces seed moisture content, which improves subsequent seed survival periods. Diverse maximum temperatures have been recommended to limit or avoid damage to seeds, but some high-temperature drying regimes may improve subsequent seed quality. Seeds from 20 different accessions of five rice ( Oryza sativa L.) variety groups (aromatic, Aus, Indica, temperate Japonica, tropical Japonica) were harvested over several seasons at different stages of maturation and either dried throughout at 15°C/15% relative humidity (RH) or for different initial periods (continuous or intermittent) in different drying regimes at 45°C before final equilibrium drying at 15°C/15% RH. Subsequent seed longevity in hermetic storage at 45°C with 10.9% moisture content was determined. In no case did initial drying at 45°C provide poorer longevity than drying at 15°C/15% RH throughout. There was a split-line relation, which did not differ amongst investigations, between longevity after initial drying at 45°C relative to that at 15°C/15% RH throughout and harvest moisture content, with a break point at 16.5% (a seed moisture status of about –14 MPa). Below 16.5%, relative longevity did not differ with harvest moisture content with little or no advantage to longevity from drying at 45°C. Above 16.5%, relative longevity showed a positive relation with harvest moisture content, with substantial benefit from drying at 45°C to subsequent longevity of seeds harvested whilst still moist. Hence, there are temporal (immediately ex planta cf. subsequent air-dried storage) and water status discontinuities (above cf. below 16.5%) in the effect of temperature on subsequent air-dried seed longevity.
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Claims 6
Claim · model-written summary
Initial drying at 45°C never gave poorer rice seed longevity than drying at 15°C throughout.
- Taxon
- rice
Oryza sativat0 - Treatment
- initial drying at 45°Ce0
- Outcome
- longevitye0
- Direction
- no case did initial drying at 45°C provide poorere0
- Comparator
- drying at 15°C/15% RH throughoute0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In no case did initial drying at 45°C provide poorer longevity than drying at 15°C/15% RH throughout.”
t0“rice seed”
Claim · model-written summary
Relative longevity versus harvest moisture followed a consistent split-line relation with a 16.5% break point.
- Taxon
- riceOryza sativat0
- Organ / stage
- harvest moisture contente0
- Outcome
- longevitye0
- Value
- 16.5%e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was a split-line relation, which did not differ amongst investigations, between longevity after initial drying at 45°C relative to that at 15°C/15% RH throughout and harvest moisture content, with a break point at 16.5%”
t0“rice seed”
Claim · model-written summary
Below 16.5% harvest moisture, rice seed relative longevity did not vary with harvest moisture.
- Taxon
- riceOryza sativat0
- Organ / stage
- harvest moisture contente0
- Outcome
- relative longevitye0
- Direction
- did not differe0
- Qualifier
- Below 16.5%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Below 16.5%, relative longevity did not differ with harvest moisture content with little or no advantage to longevity from drying at 45°C.”
t0“rice seed”
Claim · model-written summary
Below 16.5% harvest moisture, drying at 45°C gave little or no longevity advantage.
- Taxon
- riceOryza sativat0
- Treatment
- drying at 45°Ce0
- Outcome
- longevitye0
- Direction
- little or no advantagee0
- Qualifier
- Below 16.5%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Below 16.5%, relative longevity did not differ with harvest moisture content with little or no advantage to longevity from drying at 45°C.”
t0“rice seed”
Claim · model-written summary
Above 16.5% harvest moisture, relative longevity rose with harvest moisture.
- Taxon
- riceOryza sativat0
- Organ / stage
- harvest moisture contente0
- Outcome
- relative longevitye0
- Direction
- positive relatione0
- Qualifier
- Above 16.5%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Above 16.5%, relative longevity showed a positive relation with harvest moisture content”
t0“rice seed”
Claim · model-written summary
Above 16.5% harvest moisture, drying at 45°C substantially benefited later seed longevity.
- Taxon
- riceOryza sativat0
- Treatment
- drying at 45°Ce0
- Outcome
- subsequent longevitye0
- Direction
- substantial benefite0
- Qualifier
- Above 16.5%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Above 16.5%, relative longevity showed a positive relation with harvest moisture content, with substantial benefit from drying at 45°C to subsequent longevity of seeds harvested whilst still moist.”
t0“rice seed”
The same questions in other papers
processing · pest · Oryza sativa (rice)Positive and negative results
6 papers in the same direction as this paper · 2 in the opposite direction
- positive
- no effect
- negative
5 papers more in this group
See all 9 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.