Abstract
Abstract Growth of pearl millet ( Pennisetum glaucum (L.) R. Br.) is affected in areas with limited and erratic rainfall, often combined with nitrogen deficiency. Therefore, effects of severe drought and nitrogen availability on mechanisms of dehydration avoidance were investigated. Five pearl millet genotypes were cultivated in soil differing in nitrogen availability, low (N1), medium (N2) or high (N3) in a climate chamber. Thirty‐five days after sowing, the plants were exposed to drought for 12 days. Drought decreased leaf area and stomatal conductance strongly and caused leaf rolling. In the youngest fully expanded leaves, drought led to an osmotic adjustment from around −0.5 to −0.9 MP a, in N1 and N2 substantially achieved by potassium accumulation. Nitrate contributed to the osmotic adjustment in N2 and N3, proline only slightly, increasingly from N1 to N2, whereas the sum of glucose, fructose and sucrose did not play a role. The dehydration independent osmotic force for water uptake (osmotic potential at full turgor) was under drought strongest at N2 and in the landrace Dembi Yellow stronger than in the cultivars Ashana and Ugandi. This contributed to the higher relative water content (RWC) of ‘Dembi Yellow’, whereas due to other factors nitrogen had no effect on the RWC.
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Claims 12
Claim · model-written summary
Drought decreased pearl millet leaf area.
- Taxon
- Pearl Millet
Cenchrus americanust0 - Treatment
- Droughte0
- Outcome
- leaf areae0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought decreased leaf area and stomatal conductance strongly and caused leaf rolling.”
t0“Pearl Millet”
Claim · model-written summary
Drought strongly decreased pearl millet stomatal conductance.
- Taxon
- Pearl MilletCenchrus americanust0
- Treatment
- Droughte0
- Outcome
- stomatal conductancee0
- Direction
- decreasede0
- Qualifier
- stronglye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought decreased leaf area and stomatal conductance strongly and caused leaf rolling.”
t0“Pearl Millet”
Claim · model-written summary
Drought caused pearl millet leaf rolling.
- Taxon
- Pearl MilletCenchrus americanust0
- Treatment
- Droughte0
- Outcome
- leaf rollinge0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought decreased leaf area and stomatal conductance strongly and caused leaf rolling.”
t0“Pearl Millet”
Claim · model-written summary
Drought caused osmotic adjustment from around −0.5 to −0.9 MP a in youngest fully expanded leaves.
- Taxon
- Pearl MilletCenchrus americanust0
- Organ / stage
- youngest fully expanded leavese0
- Treatment
- droughte0
- Outcome
- osmotic adjustmente0
- Direction
- from around −0.5 to −0.9 MP ae0
- Value
- −0.5 to −0.9 MP ae0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the youngest fully expanded leaves, drought led to an osmotic adjustment from around −0.5 to −0.9 MP a”
t0“Pearl Millet”
Claim · model-written summary
Potassium accumulation substantially contributed to osmotic adjustment under N1 and N2.
- Taxon
- Pearl MilletCenchrus americanust0
- Compound
- potassiume0
- Outcome
- osmotic adjustmente1
- Qualifier
- in N1 and N2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in N1 and N2 substantially achieved by potassium accumulation”
e1“drought led to an osmotic adjustment”
t0“Pearl Millet”
Claim · model-written summary
Nitrate contributed to osmotic adjustment in N2 and N3.
- Taxon
- Pearl MilletCenchrus americanust0
- Compound
- Nitratee0
- Outcome
- osmotic adjustmente0
- Qualifier
- in N2 and N3e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrate contributed to the osmotic adjustment in N2 and N3”
t0“Pearl Millet”
Claim · model-written summary
Proline contributed only slightly to osmotic adjustment, increasingly from N1 to N2.
- Taxon
- Pearl MilletCenchrus americanust0
- Compound
- prolinee0
- Outcome
- osmotic adjustmente1
- Qualifier
- only slightly, increasingly from N1 to N2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“proline only slightly, increasingly from N1 to N2”
e1“Nitrate contributed to the osmotic adjustment in N2 and N3”
t0“Pearl Millet”
Claim · model-written summary
Glucose, fructose and sucrose did not contribute to osmotic adjustment.
- Taxon
- Pearl MilletCenchrus americanust0
- Compound
- glucose, fructose and sucrosee0
- Outcome
- osmotic adjustmente1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the sum of glucose, fructose and sucrose did not play a role”
e1“Nitrate contributed to the osmotic adjustment in N2 and N3”
t0“Pearl Millet”
Claim · model-written summary
Under drought, osmotic potential at full turgor was strongest at N2.
- Taxon
- Pearl MilletCenchrus americanust0
- Outcome
- osmotic potential at full turgore0
- Direction
- strongeste0
- Qualifier
- under droughte0
- Comparator
- N2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The dehydration independent osmotic force for water uptake (osmotic potential at full turgor) was under drought strongest at N2”
t0“Pearl Millet”
Claim · model-written summary
Osmotic potential at full turgor was stronger in Dembi Yellow than in Ashana and Ugandi.
- Taxon
- Pearl MilletCenchrus americanust0
- Material
- Dembi Yellowe0
- Outcome
- osmotic potential at full turgore1
- Direction
- strongere0
- Comparator
- Ashana and Ugandie0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in the landrace Dembi Yellow stronger than in the cultivars Ashana and Ugandi”
e1“osmotic potential at full turgor”
t0“Pearl Millet”
Claim · model-written summary
Stronger osmotic force contributed to higher relative water content in Dembi Yellow.
- Taxon
- Pearl MilletCenchrus americanust0
- Material
- Dembi Yellowe0
- Outcome
- relative water content (RWC)e0
- Direction
- highere0
- Qualifier
- dehydration independent osmotic force for water uptakee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This contributed to the higher relative water content (RWC) of ‘Dembi Yellow’”
e1“The dehydration independent osmotic force for water uptake”
t0“Pearl Millet”
Claim · model-written summary
Nitrogen had no effect on relative water content.
- Taxon
- Pearl MilletCenchrus americanust0
- Treatment
- nitrogene0
- Outcome
- RWCe0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nitrogen had no effect on the RWC”
e1“relative water content (RWC)”
t0“Pearl Millet”
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2 papers in the same direction as this paper
- negative
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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.