Abstract
Abstract The reproductive stage of rice is the most sensitive to heat stress, which can lead to spikelet sterility. Thus, heat-tolerant and heat-susceptible genotypes were used to investigate their differences in terms of phenotypic responses and expression changes of Hsf genes at the pre-flowering stage under heat stress. Results clearly showed that panicles had the highest temperature compared with other plant parts under both natural and heated conditions. However, the temperatures of tolerant and susceptible genotypes were not significantly different. In terms of spikelet fertility, the tolerant lines M9962 and M7988 had high seed set because their anther dehiscence, pollen viability and pollen germination were only slightly affected. In contrast, the susceptible line Sinlek showed severe effects at all steps of fertilization, and the pollen viability of M7766 was slightly affected under heat stress but was more affected in terms of anther dehiscence and pollen germination. Both susceptible lines showed dramatically decreased seed set. In addition, the expression of six HsfA genes in the flag leaves and spikelets at the R2 stage of plants under heat stress showed different responses. Notably, expression of the HsfA2a gene was predominantly upregulated in the flag leaf and spikelets under heat stress in M9962. Therefore, it can be concluded that heat stress has severe effects on the stamen, and that different genotypes have different susceptibilities to heat stress.
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Claims 10
Claim · model-written summary
Panicles had the highest temperature among plant parts under natural and heated conditions.
- Taxon
- rice (Oryza sativa L.)
Oryza sativat0 - Organ / stage
- paniclese0
- Outcome
- temperaturee0
- Direction
- higheste0
- Comparator
- other plant partse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“panicles had the highest temperature compared with other plant parts under both natural and heated conditions”
t0“rice (Oryza sativa L.)”
Claim · model-written summary
Tolerant and susceptible genotypes did not differ significantly in temperature.
- Taxon
- rice (Oryza sativa L.)Oryza sativat0
- Material
- tolerant and susceptible genotypese0
- Outcome
- temperaturese0
- Direction
- not significantly differente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“temperatures of tolerant and susceptible genotypes were not significantly different”
t0“rice (Oryza sativa L.)”
Claim · model-written summary
M9962 retained high seed set with only slight effects on anther dehiscence, pollen viability and germination.
- Taxon
- rice (Oryza sativa L.)Oryza sativat0
- Material
- M9962e0
- Outcome
- high seed sete0
- Qualifier
- anther dehiscence, pollen viability and pollen germination were only slightly affectede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tolerant lines M9962 and M7988 had high seed set because their anther dehiscence, pollen viability and pollen germination were only slightly affected”
t0“rice (Oryza sativa L.)”
Claim · model-written summary
M7988 retained high seed set with only slight effects on anther dehiscence, pollen viability and germination.
- Taxon
- rice (Oryza sativa L.)Oryza sativat0
- Material
- M7988e0
- Outcome
- high seed sete0
- Qualifier
- anther dehiscence, pollen viability and pollen germination were only slightly affectede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tolerant lines M9962 and M7988 had high seed set because their anther dehiscence, pollen viability and pollen germination were only slightly affected”
t0“rice (Oryza sativa L.)”
Claim · model-written summary
Sinlek had severe effects at all fertilization steps under heat.
- Taxon
- rice (Oryza sativa L.)Oryza sativat0
- Material
- Sinleke0
- Treatment
- heat stresst0
- Outcome
- all steps of fertilizatione0
- Direction
- severe effectse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“susceptible line Sinlek showed severe effects at all steps of fertilization”
t0“heat stress in tolerant and susceptible rice (Oryza sativa L.) genotypes”
Claim · model-written summary
M7766 pollen viability was slightly affected under heat.
- Taxon
- rice (Oryza sativa L.)Oryza sativat0
- Material
- M7766e0
- Treatment
- heat stresse0
- Outcome
- pollen viabilitye0
- Direction
- slightly affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“pollen viability of M7766 was slightly affected under heat stress”
t0“rice (Oryza sativa L.)”
Claim · model-written summary
M7766 anther dehiscence and pollen germination were more affected by heat.
- Taxon
- rice (Oryza sativa L.)Oryza sativat0
- Material
- M7766e0
- Treatment
- heat stresse0
- Outcome
- anther dehiscence and pollen germinatione0
- Direction
- more affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“pollen viability of M7766 was slightly affected under heat stress but was more affected in terms of anther dehiscence and pollen germination”
t0“rice (Oryza sativa L.)”
Claim · model-written summary
Both susceptible lines showed dramatically decreased seed set.
- Taxon
- rice (Oryza sativa L.)Oryza sativat0
- Material
- susceptible linese0
- Treatment
- heat stresst0
- Outcome
- seed sete0
- Direction
- dramatically decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both susceptible lines showed dramatically decreased seed set”
t0“heat stress in tolerant and susceptible rice (Oryza sativa L.) genotypes”
Claim · model-written summary
Six HsfA genes had differing expression responses in flag leaves and spikelets under heat.
- Taxon
- rice (Oryza sativa L.)Oryza sativat0
- Organ / stage
- flag leaves and spikeletse0
- Gene
- HsfA genese0
- Outcome
- different responsese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“expression of six HsfA genes in the flag leaves and spikelets at the R2 stage of plants under heat stress showed different responses”
t0“rice (Oryza sativa L.)”
Claim · model-written summary
HsfA2a expression was predominantly upregulated in M9962 flag leaves and spikelets under heat.
- Taxon
- rice (Oryza sativa L.)Oryza sativat0
- Material
- M9962e0
- Organ / stage
- flag leaf and spikeletse0
- Treatment
- heat stresse0
- Gene
- HsfA2a genee0
- Outcome
- expressione0
- Direction
- upregulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“expression of the HsfA2a gene was predominantly upregulated in the flag leaf and spikelets under heat stress in M9962”
t0“rice (Oryza sativa L.)”
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See all 195 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.