Abstract
A study was undertaken in the Canberra phytotron of the response of 66 cultivars of wheat to high temperature (30/25¦C) imposed throughout the period of grain development. The results from 20 Australian cultivars and their parental lines showed half of these to be clustered in the range where grain dry weight was reduced by 30-35% in response to high temperature when compared with 18/13¦C controls. The non-Australian lines were more normally distributed in their response to high temperature and included some cultivars that were less sensitive to high temperature than the best of the Australian lines. It was concluded that there is a need for a wider assessment of genetic variation if a response to high temperature is to be incorporated in a breeding programme. A more specific study on Kalyansona, one of the better cultivars under high temperature conditions and high radiation levels, failed to reveal a specific source of temperature insensitivity in the background of Kalyansona. A comparison of the response to high temperature during grain development of twoF1 hybrids with their parental lines (Banks, Kalyansona and Pinnacle) provided some evidence that traits such as high grain number per ear, large grains and low sensitivity to high temperature could be effectively combined to produce a high grain weight per ear under high temperature conditions.
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Claims 6
Claim · model-written summary
Half of the 20 Australian wheat cultivars had grain dry weight reductions of 30-35% at 30/25¦C versus 18/13¦C controls.
- Taxon
- wheat
Triticum aestivume0t0 - Treatment
- high temperaturee0
- Outcome
- grain dry weighte0
- Direction
- reducede0
- Value
- 30-35%e0
- Comparator
- 18/13¦C controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“half of these to be clustered in the range where grain dry weight was reduced by 30-35% in response to high temperature when compared with 18/13¦C controls”
t0“The tolerance of wheat to hight temperatures during reproductive growth. 2. Grain development”
Claim · model-written summary
Non-Australian wheat lines showed a more normal distribution of high-temperature response.
- Taxon
- wheatTriticum aestivume0t0
- Material
- non-Australian linese0
- Outcome
- response to high temperaturee0
- Direction
- more normally distributede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The non-Australian lines were more normally distributed in their response to high temperature”
t0“The tolerance of wheat to hight temperatures during reproductive growth. 2. Grain development”
Claim · model-written summary
Some non-Australian cultivars were less sensitive to high temperature than the best Australian lines.
- Taxon
- wheatTriticum aestivume0t0
- Material
- cultivarse0
- Outcome
- sensitive to high temperaturee0
- Direction
- lesse0
- Comparator
- the best of the Australian linese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“some cultivars that were less sensitive to high temperature than the best of the Australian lines”
t0“The tolerance of wheat to hight temperatures during reproductive growth. 2. Grain development”
Claim · model-written summary
A wider assessment of genetic variation is needed before breeding for high-temperature response.
- Taxon
- wheatTriticum aestivume0t0
- Outcome
- wider assessment of genetic variatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there is a need for a wider assessment of genetic variation if a response to high temperature is to be incorporated in a breeding programme”
t0“The tolerance of wheat to hight temperatures during reproductive growth. 2. Grain development”
Claim · model-written summary
A specific source of temperature insensitivity was not found in Kalyansona.
- Taxon
- wheatTriticum aestivume0t0
- Material
- Kalyansonae0
- Outcome
- specific source of temperature insensitivitye0
- Direction
- failed to reveale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“failed to reveal a specific source of temperature insensitivity in the background of Kalyansona”
t0“The tolerance of wheat to hight temperatures during reproductive growth. 2. Grain development”
Claim · model-written summary
Two F1 hybrids suggested high grain number, large grains and low temperature sensitivity can be combined for high grain weight per ear.
- Taxon
- wheatTriticum aestivume0t0
- Outcome
- high grain weight per eare0
- Direction
- highe0
- Qualifier
- high temperature conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“traits such as high grain number per ear, large grains and low sensitivity to high temperature could be effectively combined to produce a high grain weight per ear under high temperature conditions”
t0“The tolerance of wheat to hight temperatures during reproductive growth. 2. Grain development”
The same questions in other papers
heat · growth · Triticum aestivum (wheat)Positive and negative results
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