Abstract
A range of Australian and overseas wheat cultivars was grown in the naturally lighted glasshouses of the Canberra phytotron, with a standard day/night temperature regime of 18/1 3¦C. Grain number per main culm ear under these standard conditions was compared with the response obtained when sets of plants were transferred to high temperature (24/19¦C, or 30/25¦C) over the period from flag leaf ligule to ear emergence (booting), or from ear emergence to the end of anthesis (pollination and fertilization).Some Australian lines such as Isis and Hybrid Titan were tolerant of high temperature at booting, while others such as Pinnacle and Olympic showed a marked sensitivity to high temperature at this stage. Cultivars from the Middle East and tropical areas were generally more tolerant of high temperature at booting than cultivars from regions such as North America and Europe, while the Australian lines were intermediate in their response. With the cultivar Pinnacle, it was shown that at least part of the low fertility associated with high temperature at booting was related to poor pollen development. Commencing the high temperature treatment earlier in the development of the ear and continuing this until ear emergence resulted in adaptation in the cultivar H757 from Afghanistan, which showed an increase in grain set above that of the short high temperature booting treatment. However, this contrasted with the response of the cultivar Banks when the extended high temperature treatment resulted in a further reduction, not an increase in grain set. It was shown that the presence of the rye translocation for rust resistance (1B/1R) in near isogenic lines of Condor resulted in reduced sensitivity to high temperature. This would suggest that species such as rye should be examined more closely for their sensitivity to environmental stress.Exposure to high temperature only during anthesis generally had a small effect oil grain set. Some cultivars showed an increase in grain set, whereas others showed a decrease. Part of this variation may be related to the finding that under high temperature conditions, high humidity (v.p.d. 6.7 mb) could reduce grain set. However, given the normal relation between temperature and humidity in Australia, this effect is likely to be limited to glasshouse conditions.
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Claims 12
Claim · model-written summary
Isis and Hybrid Titan tolerated high temperature at booting.
- Taxon
- wheat
Triticum aestivumt0 - Material
- Isis and Hybrid Titane0
- Outcome
- tolerant of high temperature at bootinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Some Australian lines such as Isis and Hybrid Titan were tolerant of high temperature at booting”
t0“wheat”
Claim · model-written summary
Pinnacle and Olympic showed marked sensitivity to booting heat.
- Taxon
- wheatTriticum aestivumt0
- Material
- Pinnacle and Olympice0
- Outcome
- marked sensitivity to high temperaturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“others such as Pinnacle and Olympic showed a marked sensitivity to high temperature at this stage”
t0“wheat”
Claim · model-written summary
Middle Eastern and tropical cultivars were more heat tolerant at booting than North American and European cultivars.
- Taxon
- wheatTriticum aestivumt0
- Material
- Cultivars from the Middle East and tropical arease0
- Outcome
- tolerant of high temperature at bootinge0
- Direction
- more tolerante0
- Comparator
- cultivars from regions such as North America and Europee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cultivars from the Middle East and tropical areas were generally more tolerant of high temperature at booting than cultivars from regions such as North America and Europe”
t0“wheat”
Claim · model-written summary
Australian lines were intermediate in booting heat response.
- Taxon
- wheatTriticum aestivumt0
- Material
- Australian linese0
- Outcome
- intermediate in their responsee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the Australian lines were intermediate in their response”
t0“wheat”
Claim · model-written summary
Poor pollen development contributed to low fertility in heat treated Pinnacle.
- Taxon
- wheatTriticum aestivumt0
- Material
- Pinnaclee0
- Organ / stage
- pollene0
- Treatment
- high temperature at bootinge0
- Outcome
- low fertilitye0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With the cultivar Pinnacle, it was shown that at least part of the low fertility associated with high temperature at booting was related to poor pollen development”
t0“wheat”
Claim · model-written summary
Extended heat treatment increased H757 grain set relative to short booting heat treatment.
- Taxon
- wheatTriticum aestivumt0
- Material
- H757e0
- Treatment
- high temperature treatment earlier in the development of the ear and continuing this until ear emergencee0
- Outcome
- grain sete0
- Direction
- increasee0
- Comparator
- short high temperature booting treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Commencing the high temperature treatment earlier in the development of the ear and continuing this until ear emergence resulted in adaptation in the cultivar H757 from Afghanistan, which showed an increase in grain set above that of the short high temperature booting treatment”
t0“wheat”
Claim · model-written summary
Extended heat treatment further reduced grain set in Banks.
- Taxon
- wheatTriticum aestivumt0
- Material
- Bankse0
- Treatment
- extended high temperature treatmente0
- Outcome
- grain sete0
- Direction
- reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the cultivar Banks when the extended high temperature treatment resulted in a further reduction, not an increase in grain set”
t0“wheat”
Claim · model-written summary
The 1B/1R rye translocation reduced heat sensitivity in Condor near isogenic lines.
- Taxon
- wheatTriticum aestivumt0
- Material
- near isogenic lines of Condore0
- Gene
- 1B/1Re0
- Outcome
- sensitivity to high temperaturee0
- Direction
- reducede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the presence of the rye translocation for rust resistance (1B/1R) in near isogenic lines of Condor resulted in reduced sensitivity to high temperature”
t0“wheat”
Claim · model-written summary
Heat during anthesis generally had a small effect on grain set.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- high temperature only during anthesise0
- Outcome
- grain sete0
- Qualifier
- small effecte0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exposure to high temperature only during anthesis generally had a small effect oil grain set”
t0“wheat”
Claim · model-written summary
Some cultivars had increased grain set during anthesis heat.
- Taxon
- wheatTriticum aestivumt0
- Material
- Some cultivarse0
- Treatment
- high temperaturee0
- Outcome
- grain sete0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exposure to high temperature only during anthesis generally had a small effect oil grain set. Some cultivars showed an increase in grain set”
t0“wheat”
Claim · model-written summary
Other cultivars had decreased grain set during anthesis heat.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- high temperaturee0
- Outcome
- grain sete0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exposure to high temperature only during anthesis generally had a small effect oil grain set. Some cultivars showed an increase in grain set, whereas others showed a decrease”
t0“wheat”
Claim · model-written summary
High humidity during high temperature could reduce grain set.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- high humidity (v.p.d. 6.7 mb)e0
- Outcome
- grain sete0
- Direction
- reducee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“under high temperature conditions, high humidity (v.p.d. 6.7 mb) could reduce grain set”
t0“wheat”
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53 papers in the same direction as this paper · 255 in the opposite direction
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See all 309 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.