Abstract
SummaryTo clarify the mechanism of high temperature-induced floret sterility in rice (Oryza sativa L.), we studied the effects of high temperature at flowering on the ability of thecae to dehisce and on pollen-grain swelling which causes thecae dehiscence. Two japonica rice cultivars, grown in four L pots under submerged soil conditions were subjected to high (39°C) and moderate (34°C) temperatures from 10 : 00 to 16 : 00 for three consecutive days at the flowering stage. The percentage of the thecae dehisced in response to artificial opening of the florets by removing lemma and the mean diameter of the pollen grains measured during four minutes after the artificial opening were examined to determine the ability of the thecae to dehisce and that of the pollen grains to swell, respectively. The high temperature given on the day of flowering decreased both the percentage of the dehisced thecae and the diameter of the pollen grains but did not affect the relationship between them. The thecae of the plants which had been subjected to the high temperature for one or two days before flowering, however, showed a lower dehiscence percentage than those of the plant treated on the day of flowering against the same pollen-grain diameter. We concluded that high temperature given on the day of flowering decreased the ability of the pollen grains to swell resulting in poor thecae dehiscence, and that, besides this decrease, high temperature given just before the days of flowering lowered the function of thecae themselves to dehisce, causing poorer thecae dehiscence.
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Claims 6
Claim · model-written summary
High temperature on flowering day decreased the proportion of dehisced thecae.
- Taxon
- rice
Oryza sativat0 - Treatment
- high temperature given on the day of floweringe0
- Outcome
- percentage of the dehisced thecaee0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The high temperature given on the day of flowering decreased both the percentage of the dehisced thecae and the diameter of the pollen grains but did not affect the relationship between them”
t0“rice”
Claim · model-written summary
High temperature on flowering day decreased pollen grain diameter.
- Taxon
- riceOryza sativat0
- Treatment
- high temperature given on the day of floweringe0
- Outcome
- diameter of the pollen grainse0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The high temperature given on the day of flowering decreased both the percentage of the dehisced thecae and the diameter of the pollen grains but did not affect the relationship between them”
t0“rice”
Claim · model-written summary
High temperature on flowering day did not affect the relationship between theca dehiscence and pollen grain diameter.
- Taxon
- riceOryza sativat0
- Treatment
- high temperature given on the day of floweringe0
- Outcome
- relationship between theme0
- Direction
- did not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The high temperature given on the day of flowering decreased both the percentage of the dehisced thecae and the diameter of the pollen grains but did not affect the relationship between them”
t0“rice”
Claim · model-written summary
Heat one or two days before flowering lowered dehiscence at a given pollen diameter relative to heat on flowering day.
- Taxon
- riceOryza sativat0
- Treatment
- high temperature for one or two days before floweringe0
- Outcome
- dehiscence percentagee0
- Direction
- lowere0
- Qualifier
- same pollen-grain diametere0
- Comparator
- plant treated on the day of floweringe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The thecae of the plants which had been subjected to the high temperature for one or two days before flowering, however, showed a lower dehiscence percentage than those of the plant treated on the day of flowering against the same pollen-grain diameter”
t0“rice”
Claim · model-written summary
The authors attribute poor dehiscence after heat on flowering day to impaired pollen swelling.
- Taxon
- riceOryza sativat0
- Treatment
- high temperature given on the day of floweringe0
- Outcome
- poor thecae dehiscencee0
- Qualifier
- decreased the ability of the pollen grains to swelle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“high temperature given on the day of flowering decreased the ability of the pollen grains to swell resulting in poor thecae dehiscence”
t0“rice”
Claim · model-written summary
The authors attribute poorer dehiscence after preflowering heat partly to impaired theca function.
- Taxon
- riceOryza sativat0
- Treatment
- high temperature given just before the days of floweringe0
- Outcome
- poorer thecae dehiscencee0
- Qualifier
- lowered the function of thecae themselves to dehiscee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“high temperature given just before the days of flowering lowered the function of thecae themselves to dehisce, causing poorer thecae dehiscence”
t0“rice”
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