Abstract
Influence of supra-optimal concentrations of K on growth, water relations, and photosynthetic capacity in pearl millet under severe water deficit conditions was assessed in a glasshouse. Nineteen-days-old plants of two lines, ICMV-94133 and WCA-78, of Pennisetum glaucum (L.) R.Br. were subjected for 30 d to 235.0, 352.5, and 470.0 mg(K) kg-1(soil) and two water regimes (100 and 30 % field capacity). Increasing K supply did not alleviate the effect of water deficit on the growth of two lines of pearl millet since additional amount of K in the growth medium had no effect on shoot dry mass, relative growth rate, plant leaf area, net assimilation rate, or leaf area ratio, although there was significant effect of drought stress on these variables. Soil moisture had a significant effect on net photosynthetic rate (PN), transpiration rate, stomatal conductance, and water use efficiency of both pearl millet lines, but there was no significant effect of varying K supply on these variables. In WCA-78 an ameliorative effect of increasing supply of K on PN was observed under water deficit. Chlorophyll (Chl) a and b contents increased significantly in both lines with increase in K supply under well watered conditions, but under water deficit they increased only in ICMV-94133. Chl a/b ratios were reduced significantly in WCA-78 with increasing K supply under both watering regimes, but by contrast, in ICMV-94133 this variable was decreased only under water stress. Leaf water potential and osmotic potential of both lines decreased significantly with the imposition of drought. Leaf pressure potential in both lines increased with increase in K supply under water stress. Contents of total free amino acids in the leaves of both pearl millet lines increased significantly with increase in K supply under water stress. Potassium supply had no effect on leaf soluble sugars or soluble proteins. Considerable osmotic adjustment occurred in pearl millet plants experiencing water deficit under high K supply.
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Claims 14
Claim · model-written summary
Increasing K supply did not alleviate water deficit effects on pearl millet growth traits.
- Taxon
- pearl millet
Cenchrus americanuse0 - Treatment
- Increasing K supplye0
- Outcome
- shoot dry mass, relative growth rate, plant leaf areae0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing K supply did not alleviate the effect of water deficit on the growth of two lines of pearl millet since additional amount of K in the growth medium had no effect on shoot dry mass, relative growth rate, plant leaf area, net assimilation rate, or leaf area ratio”
Claim · model-written summary
Drought significantly affected pearl millet growth traits.
- Taxon
- pearl milletCenchrus americanuse2
- Treatment
- drought stresse0
- Outcome
- shoot dry mass, relative growth rate, plant leaf areae1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“significant effect of drought stress on these variables”
e1“shoot dry mass, relative growth rate, plant leaf area, net assimilation rate, or leaf area ratio”
e2“Pearl Millet under Water Stress”
Claim · model-written summary
Soil moisture significantly affected photosynthetic rate, transpiration, stomatal conductance and water use efficiency in both pearl millet lines.
- Taxon
- pearl milletCenchrus americanuse0
- Treatment
- Soil moisturee0
- Outcome
- net photosynthetic rate (PN), transpiration rate, stomatal conductancee0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soil moisture had a significant effect on net photosynthetic rate (PN), transpiration rate, stomatal conductance, and water use efficiency of both pearl millet lines”
Claim · model-written summary
Varying K supply had no significant effect on photosynthetic rate, transpiration, stomatal conductance and water use efficiency in both pearl millet lines.
- Taxon
- pearl milletCenchrus americanuse1
- Treatment
- varying K supplye0
- Outcome
- net photosynthetic rate (PN), transpiration rate, stomatal conductancee1
- Direction
- no significant effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was no significant effect of varying K supply on these variables”
e1“net photosynthetic rate (PN), transpiration rate, stomatal conductance, and water use efficiency of both pearl millet lines”
Claim · model-written summary
Increasing K improved net photosynthetic rate under water deficit in WCA-78.
- Taxon
- pearl milletCenchrus americanuse1
- Material
- WCA-78e0
- Treatment
- increasing supply of Ke0
- Outcome
- PNe0
- Direction
- ameliorativee0
- Qualifier
- under water deficite0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In WCA-78 an ameliorative effect of increasing supply of K on PN was observed under water deficit.”
e1“Pearl Millet under Water Stress”
Claim · model-written summary
Increasing K significantly raised chlorophyll a and b contents in both lines under well watered conditions.
- Taxon
- pearl milletCenchrus americanuse1
- Treatment
- increase in K supplye0
- Outcome
- Chlorophyll (Chl) a and b contentse0
- Direction
- increasede0
- Qualifier
- under well watered conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chlorophyll (Chl) a and b contents increased significantly in both lines with increase in K supply under well watered conditions”
e1“Pearl Millet under Water Stress”
Claim · model-written summary
Increasing K raised chlorophyll a and b contents under water deficit only in ICMV-94133.
- Taxon
- pearl milletCenchrus americanuse3
- Material
- ICMV-94133e0
- Treatment
- increase in K supplye2
- Outcome
- Chlorophyll (Chl) a and b contentse1
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“under water deficit they increased only in ICMV-94133”
e1“Chlorophyll (Chl) a and b contents”
e2“both lines with increase in K supply under well watered conditions”
e3“Pearl Millet under Water Stress”
Claim · model-written summary
Increasing K significantly reduced chlorophyll a/b ratio in WCA-78 under both water regimes.
- Taxon
- pearl milletCenchrus americanuse1
- Material
- WCA-78e0
- Treatment
- increasing K supplye0
- Outcome
- Chl a/b ratiose0
- Direction
- reducede0
- Qualifier
- under both watering regimese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chl a/b ratios were reduced significantly in WCA-78 with increasing K supply under both watering regimes”
e1“Pearl Millet under Water Stress”
Claim · model-written summary
Increasing K decreased chlorophyll a/b ratio in ICMV-94133 only under water stress.
- Taxon
- pearl milletCenchrus americanuse3
- Material
- ICMV-94133e0
- Treatment
- increasing K supplye2
- Outcome
- Chl a/b ratiose1
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in ICMV-94133 this variable was decreased only under water stress”
e1“Chl a/b ratios”
e2“increasing K supply”
e3“Pearl Millet under Water Stress”
Claim · model-written summary
Drought significantly decreased leaf water and osmotic potentials in both pearl millet lines.
- Taxon
- pearl milletCenchrus americanuse1
- Treatment
- imposition of droughte0
- Outcome
- Leaf water potential and osmotic potentiale0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf water potential and osmotic potential of both lines decreased significantly with the imposition of drought.”
e1“Pearl Millet under Water Stress”
Claim · model-written summary
Increasing K under water stress increased leaf pressure potential in both pearl millet lines.
- Taxon
- pearl milletCenchrus americanuse1
- Treatment
- increase in K supplye0
- Outcome
- Leaf pressure potentiale0
- Direction
- increasede0
- Qualifier
- under water stresse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf pressure potential in both lines increased with increase in K supply under water stress.”
e1“Pearl Millet under Water Stress”
Claim · model-written summary
Increasing K under water stress significantly increased leaf total free amino acids in both pearl millet lines.
- Taxon
- pearl milletCenchrus americanuse0
- Treatment
- increase in K supplye0
- Outcome
- Contents of total free amino acidse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Contents of total free amino acids in the leaves of both pearl millet lines increased significantly with increase in K supply under water stress.”
Claim · model-written summary
Potassium supply did not affect pearl millet leaf soluble sugars or proteins.
- Taxon
- pearl milletCenchrus americanuse1
- Treatment
- Potassium supplye0
- Outcome
- leaf soluble sugars or soluble proteinse0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Potassium supply had no effect on leaf soluble sugars or soluble proteins.”
e1“Pearl Millet under Water Stress”
Claim · model-written summary
Pearl millet under water deficit and high K supply showed considerable osmotic adjustment.
- Taxon
- pearl milletCenchrus americanuse0
- Outcome
- osmotic adjustmente0
- Qualifier
- experiencing water deficit under high K supplye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Considerable osmotic adjustment occurred in pearl millet plants experiencing water deficit under high K supply.”
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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.