Abstract
Plants of Triticum aestivum L. cv. Gabo, grown at 20 °C, were exposed to 30 °C for short periods during the time between the beginning of meiosis in the pollen mother cells and anthesis. Plant water deficit at this temperature was avoided by maintaining a high atmospheric relative humidity and tissue water potential did not change. This temperature treatment applied for 3 days, at the time of reduction division and tetrad break up in the male tissue, lowered grain yield through a drastic reduction in grain set, but was without effect at other stages of development. Grain set was also reduced by exposing plants to 30 °C for 1 day only or to a 30 °C day, 20 °C night (16 h photoperiod) regime for 3 days during the sensitive period. A reduction in grain set did not result in a compensatory increase in the weight of remaining grains. The female fertility of previously heat-stressed plants was assessed by pollinating with pollen from plants grown at a lower temperature (20 °C). Grain set in such plants was less than that in plants grown at the lower temperature and hand pollinated with similar pollen, indicating that female fertility was reduced by high temperature. This was not the sole reason for reduced grain set, however, as some anthers on heat-stressed plants were small and neither extruded nor dehisced normally. Such anthers contained pollen grains that were mostly shrivelled, had abnormal cytoplasm and showed no reaction to 2, 3, 5-triphenyl tetrazolium chloride. Similar effects were also noted in pollen from apparently normal anthers on heat-stressed plants.
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Claims 12
Claim · model-written summary
High temperature did not change tissue water potential under high humidity.
- Taxon
- Triticum aestivum L.
Triticum aestivumt0 - Treatment
- this temperaturee0
- Outcome
- tissue water potentiale0
- Direction
- did not changee0
- Qualifier
- high atmospheric relative humiditye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plant water deficit at this temperature was avoided by maintaining a high atmospheric relative humidity and tissue water potential did not change”
t0“Triticum aestivum L.”
Claim · model-written summary
Three days at 30 °C during reduction division and tetrad breakup lowered grain yield through reduced grain set.
- Taxon
- Triticum aestivum L.Triticum aestivumt0
- Treatment
- temperature treatment applied for 3 dayse0
- Outcome
- grain yielde0
- Direction
- lowerede0
- Qualifier
- at the time of reduction division and tetrad break up in the male tissuee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This temperature treatment applied for 3 days, at the time of reduction division and tetrad break up in the male tissue, lowered grain yield through a drastic reduction in grain set”
t0“Triticum aestivum L.”
Claim · model-written summary
Three days of heat during the sensitive period drastically reduced grain set.
- Taxon
- Triticum aestivum L.Triticum aestivumt0
- Treatment
- temperature treatment applied for 3 dayse0
- Outcome
- grain sete0
- Direction
- reductione0
- Qualifier
- at the time of reduction division and tetrad break up in the male tissuee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This temperature treatment applied for 3 days, at the time of reduction division and tetrad break up in the male tissue, lowered grain yield through a drastic reduction in grain set”
t0“Triticum aestivum L.”
Claim · model-written summary
The same heat treatment had no effect at other developmental stages.
- Taxon
- Triticum aestivum L.Triticum aestivumt0
- Outcome
- other stages of developmente0
- Direction
- without effecte0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but was without effect at other stages of development”
t0“Triticum aestivum L.”
Claim · model-written summary
One day at 30 °C in the sensitive period reduced grain set.
- Taxon
- Triticum aestivum L.Triticum aestivumt0
- Treatment
- 30 °C for 1 day onlye0
- Outcome
- Grain sete0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain set was also reduced by exposing plants to 30 °C for 1 day only”
t0“Triticum aestivum L.”
Claim · model-written summary
A 30 °C day and 20 °C night regime for three days reduced grain set.
- Taxon
- Triticum aestivum L.Triticum aestivumt0
- Treatment
- 30 °C day, 20 °C night (16 h photoperiod) regime for 3 dayse0
- Outcome
- Grain sete0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain set was also reduced by exposing plants to 30 °C for 1 day only or to a 30 °C day, 20 °C night (16 h photoperiod) regime for 3 days during the sensitive period”
t0“Triticum aestivum L.”
Claim · model-written summary
Lower grain set did not cause compensatory grain weight gain.
- Taxon
- Triticum aestivum L.Triticum aestivumt0
- Organ / stage
- remaining grainse0
- Outcome
- weight of remaining grainse0
- Direction
- did not result in a compensatory increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A reduction in grain set did not result in a compensatory increase in the weight of remaining grains”
t0“Triticum aestivum L.”
Claim · model-written summary
Previously heated plants had lower grain set despite hand pollination with pollen from cooler-grown plants.
- Taxon
- Triticum aestivum L.Triticum aestivumt0
- Outcome
- Grain sete0
- Direction
- less thane0
- Comparator
- plants grown at the lower temperature and hand pollinated with similar pollene0
Not reportedTreatment
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain set in such plants was less than that in plants grown at the lower temperature and hand pollinated with similar pollen”
t0“Triticum aestivum L.”
Claim · model-written summary
Heat reduced female fertility.
- Taxon
- Triticum aestivum L.Triticum aestivumt0
- Treatment
- high temperaturee0
- Outcome
- female fertilitye0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“female fertility was reduced by high temperature”
t0“Triticum aestivum L.”
Claim · model-written summary
Some heat stressed anthers were small and failed normal extrusion and dehiscence.
- Taxon
- Triticum aestivum L.Triticum aestivumt0
- Treatment
- heat-stressede0
- Outcome
- anthers on heat-stressed plants were small and neither extruded nor dehisced normallye0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“some anthers on heat-stressed plants were small and neither extruded nor dehisced normally”
t0“Triticum aestivum L.”
Claim · model-written summary
Pollen in abnormal heat stressed anthers was mostly shrivelled with abnormal cytoplasm and no tetrazolium reaction.
- Taxon
- Triticum aestivum L.Triticum aestivumt0
- Outcome
- pollen grains that were mostly shrivelled, had abnormal cytoplasm and showed no reaction to 2, 3, 5-triphenyl tetrazolium chloridee0
Not reportedTreatmentComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Such anthers contained pollen grains that were mostly shrivelled, had abnormal cytoplasm and showed no reaction to 2, 3, 5-triphenyl tetrazolium chloride”
t0“Triticum aestivum L.”
Claim · model-written summary
Apparently normal anthers on heat stressed plants had similar pollen abnormalities.
- Taxon
- Triticum aestivum L.Triticum aestivumt0
- Organ / stage
- pollen from apparently normal antherse0
- Outcome
- Similar effectse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Similar effects were also noted in pollen from apparently normal anthers on heat-stressed plants”
t0“Triticum aestivum L.”
The same questions in other papers
light · yield · Triticum aestivum (wheat)Positive and negative results
34 papers in the same direction as this paper · 33 in the opposite direction
- positive
- positive
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64 papers more in this group
See all 68 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.