Abstract
Summary Three early and four later flowering lines of sorghum were subjected to three drought stress treatments (early, late and early plus late stress) in the field during the dry season at Hyderabad in India. Mean diurnal temperature and evaporation rate were uniformly high throughout the experiment. The late and early plus late stress conditions were severe, while the early stress was mild. Grain yield was affected by both the timing and the severity of the stress. The largest reduction (87%) in grain yield resulted from stress imposed during booting and flowering (late stress) in the early flowering lines; the same stress treatment on vegetative plants had no effect on grain yield. Increasing the duration of severe stress on vegetative plants (early plus late stress) reduced grain yield by 50–60%. Grain yield was strongly and positively correlated with the number of grains m -2 . Variation in grain yield was associated with variation in total dry matter rather than with harvest index, which was only reduced when stress occurred at flowering. Treatment effects on thermal growth rates (g m -2 °Cd -1 ) during the phase from booting to flowering confirmed that growth during this phase is the major determinant of yield potential (number of grains). The importance of phonology in research into drought resistance is discussed.
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Claims 8
Claim · model-written summary
Grain yield depended on stress timing and severity.
SorghumNot reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain yield was affected by both the timing and the severity of the stress.”
t0“Sorghum (Sorghum Bicolor)”
Claim · model-written summary
Late stress at booting and flowering reduced grain yield 87% in early flowering lines.
- Material
- early flowering linese0
- Treatment
- stress imposed during booting and flowering (late stress)e0
- Outcome
- grain yielde0
- Direction
- reductione0
- Value
- 87%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The largest reduction (87%) in grain yield resulted from stress imposed during booting and flowering (late stress) in the early flowering lines”
t0“Sorghum (Sorghum Bicolor)”
Claim · model-written summary
The same stress on vegetative plants had no grain yield effect.
- Organ / stage
- vegetative plantse0
- Treatment
- same stress treatmente0
- Outcome
- grain yielde0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the same stress treatment on vegetative plants had no effect on grain yield.”
t0“Sorghum (Sorghum Bicolor)”
Claim · model-written summary
Prolonged severe stress on vegetative plants reduced yield 50–60%.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing the duration of severe stress on vegetative plants (early plus late stress) reduced grain yield by 50–60%.”
t0“Sorghum (Sorghum Bicolor)”
Claim · model-written summary
Grain yield correlated positively with grains per square meter.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain yield was strongly and positively correlated with the number of grains m -2 .”
t0“Sorghum (Sorghum Bicolor)”
Claim · model-written summary
Yield variation was associated with dry matter variation rather than harvest index.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Variation in grain yield was associated with variation in total dry matter rather than with harvest index”
t0“Sorghum (Sorghum Bicolor)”
Claim · model-written summary
Harvest index fell only when stress occurred at flowering.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“harvest index, which was only reduced when stress occurred at flowering.”
t0“Sorghum (Sorghum Bicolor)”
Claim · model-written summary
Growth between booting and flowering was a major determinant of yield potential measured as grain number.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“growth during this phase is the major determinant of yield potential (number of grains).”
t0“Sorghum (Sorghum Bicolor)”
The same questions in other papers
stage · yield · SorghumPositive and negative results
11 papers in the same direction as this paper · 17 in the opposite direction
- positive
- positive
- positive
25 papers more in this group
See all 29 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.