Abstract
Several studies have identified low soil P and water availability as major constraints to pearl millet [ Pennisetum glaucum (L.) R. Br.] production in semi‐arid West Africa. To evaluate the effects of phosphate and water supply on yield, transpirational water‐use efficiency (WUE T ), and carbon‐isotope discrimination (Δ), two varieties of pearl millet were cultivated in pots in a glasshouse at the ICRISAT Sahelian Centre, near Niamey, Niger. Phosphate and water supply had significant effects on yield, WUE T , and Δ. Compared with the control plants, which had adequate water and P availability, yield was reduced 34% by low water supply and 48% by low P supply. Under high P‐supply, water stress increased WUE T by approximately 37%. Under low P‐supply, no effect of water supply on WUE T was observed. Water stress increased Δ by approximately 0.6‰ for low P plants, and 0.9‰ for high P plants. Added P increased Δ by 0.3 to 0.4‰. WUE T and Δ did not differ significantly between varieties. Differences in Δ between green and necrotic leaves were found within both P treatments under low water supply. We attribute changes in Δ to changes in the ratio of external to internal concentration of CO 2 , ( p i / p a ), leakage rates of CO 2 out of bundle‐sheath cells, respiration rates, or chemical composition of the plant material.
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Claims 9
Claim · model-written summary
Low water supply reduced pearl millet yield by 34%.
- Taxon
- Pearl Millet
Cenchrus americanust0 - Treatment
- low water supplye0
- Outcome
- yielde0
- Direction
- reducede0
- Value
- 34%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“yield was reduced 34% by low water supply”
t0“Pearl Millet”
Claim · model-written summary
Low phosphorus supply reduced yield by 48%.
- Taxon
- Pearl MilletCenchrus americanust0
- Treatment
- low P supplye0
- Outcome
- yielde0
- Direction
- reducede0
- Value
- 48%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“yield was reduced 34% by low water supply and 48% by low P supply”
t0“Pearl Millet”
Claim · model-written summary
Under high phosphorus supply, water stress raised transpirational water use efficiency about 37%.
- Taxon
- Pearl MilletCenchrus americanust0
- Treatment
- water stresse0
- Outcome
- WUE Te0
- Direction
- increasede0
- Value
- approximately 37%e0
- Qualifier
- high P‐supplye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under high P‐supply, water stress increased WUE T by approximately 37%.”
t0“Pearl Millet”
Claim · model-written summary
Under low phosphorus supply, water supply did not affect water use efficiency.
- Taxon
- Pearl MilletCenchrus americanust0
- Treatment
- water supplye0
- Outcome
- WUE Te0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under low P‐supply, no effect of water supply on WUE T was observed.”
t0“Pearl Millet”
Claim · model-written summary
Water stress increased isotope discrimination by approximately 0.6‰ at low phosphorus.
- Taxon
- Pearl MilletCenchrus americanust0
- Treatment
- Water stresse0
- Outcome
- Δe0
- Direction
- increasede0
- Value
- approximately 0.6‰e0
- Qualifier
- low P plantse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water stress increased Δ by approximately 0.6‰ for low P plants”
t0“Pearl Millet”
Claim · model-written summary
Water stress increased isotope discrimination by 0.9‰ at high phosphorus.
- Taxon
- Pearl MilletCenchrus americanust0
- Treatment
- Water stresse0
- Outcome
- Δe0
- Direction
- increasede0
- Value
- 0.9‰e0
- Qualifier
- high P plantse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water stress increased Δ by approximately 0.6‰ for low P plants, and 0.9‰ for high P plants.”
t0“Pearl Millet”
Claim · model-written summary
Added phosphorus increased isotope discrimination by 0.3 to 0.4‰.
- Taxon
- Pearl MilletCenchrus americanust0
- Treatment
- Added Pe0
- Outcome
- Δe0
- Direction
- increasede0
- Value
- 0.3 to 0.4‰e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Added P increased Δ by 0.3 to 0.4‰.”
t0“Pearl Millet”
Claim · model-written summary
Varieties did not differ significantly in water use efficiency or isotope discrimination.
- Taxon
- Pearl MilletCenchrus americanust0
- Outcome
- WUE T and Δe0
- Direction
- did not differe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“WUE T and Δ did not differ significantly between varieties.”
t0“Pearl Millet”
Claim · model-written summary
Green and necrotic leaves differed in isotope discrimination under low water supply in both phosphorus treatments.
- Taxon
- Pearl MilletCenchrus americanust0
- Organ / stage
- green and necrotic leavese0
- Outcome
- Differences in Δe0
- Qualifier
- under low water supplye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Differences in Δ between green and necrotic leaves were found within both P treatments under low water supply.”
t0“Pearl Millet”
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