Abstract
• High incubation temperatures (i.e. 30°C) stimulate the germination of dormant sorghum grains. To test the hormonal nature of this response, experiments were carried out with two varieties with contrasting dormancy at harvest: Redland B2 (low dormancy, high germination percentages attained under a wide incubation thermal range) and IS 9530 (high dormancy, high germination percentages attained only at 30°C). • Redland B2 grains with reduced GA content (paclobutrazol-treated) reached high germination temperatures (c. 100%) only when incubated at 30°C. By contrast, IS 9530 grains with reduced ABA content (fluridone-treated) reached 100% germination at 30, 25, 20 and 15°C. • Incubation temperatures did not alter embryo responsiveness to ABA, nor did it modify the pattern of changes in embryo ABA content throughout incubation. Low GA3 concentrations (0.1 µm) were required to totally overcome the inhibition imposed by ABA in embryos incubated at 30°C; by contrast, even the highest GA3 concentrations used (1000 µm) were not able to revert ABA inhibition in embryos incubated at 15°C. • These results show the hormonal nature of the stimulatory effect of high incubation temperatures, and suggest that this effect is mediated by an increase in tissue responsiveness to GAs.
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Claims 7
Claim · model-written summary
Redland B2 grains with reduced GA content reached about 100% germination only at 30°C.
- Material
- Redland B2e0
- Treatment
- paclobutrazol-treatede0
- Outcome
- germination temperaturese0
- Value
- c. 100%e0
- Qualifier
- only when incubated at 30°Ce0
SorghumNot reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sorghum (S. bicolor)”
e0“Redland B2 grains with reduced GA content (paclobutrazol-treated) reached high germination temperatures (c. 100%) only when incubated at 30°C”
Claim · model-written summary
IS 9530 grains with reduced ABA content reached 100% germination at 30, 25, 20 and 15°C.
- Material
- IS 9530e0
- Treatment
- fluridone-treatede0
- Outcome
- germinatione0
- Value
- 100%e0
- Qualifier
- at 30, 25, 20 and 15°Ce0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sorghum (S. bicolor)”
e0“IS 9530 grains with reduced ABA content (fluridone-treated) reached 100% germination at 30, 25, 20 and 15°C”
Claim · model-written summary
Incubation temperature did not alter embryo responsiveness to ABA.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sorghum (S. bicolor)”
e0“Incubation temperatures did not alter embryo responsiveness to ABA”
Claim · model-written summary
Incubation temperature did not modify changes in embryo ABA content during incubation.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sorghum (S. bicolor)”
e0“nor did it modify the pattern of changes in embryo ABA content throughout incubation”
Claim · model-written summary
At 30°C, 0.1 µm GA3 totally overcame ABA inhibition in embryos.
- Organ / stage
- embryose0
- Treatment
- GA3 concentrations (0.1 µm)e0
- Outcome
- inhibition imposed by ABAe0
- Direction
- totally overcomee0
- Qualifier
- incubated at 30°Ce0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sorghum (S. bicolor)”
e0“Low GA3 concentrations (0.1 µm) were required to totally overcome the inhibition imposed by ABA in embryos incubated at 30°C”
Claim · model-written summary
At 15°C, even 1000 µm GA3 did not reverse ABA inhibition in embryos.
- Organ / stage
- embryose0
- Treatment
- GA3 concentrations used (1000 µm)e0
- Outcome
- ABA inhibitione0
- Direction
- were not able to reverte0
- Qualifier
- incubated at 15°Ce0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sorghum (S. bicolor)”
e0“even the highest GA3 concentrations used (1000 µm) were not able to revert ABA inhibition in embryos incubated at 15°C”
Claim · model-written summary
The authors suggest high temperature stimulates germination through increased tissue responsiveness to GAs.
- Outcome
- increase in tissue responsiveness to GAse0
- Qualifier
- mediated by an increase in tissue responsiveness to GAse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sorghum (S. bicolor)”
e0“this effect is mediated by an increase in tissue responsiveness to GAs”
The same questions in other papers
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1 paper in the same direction as this paper
- positive
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.