Abstract
Water stress adversely affects the photosynthetic apparatus and pigment composition in plants, leading to reduced yields and compromised plant health. Zinc (Zn) foliar spray in nano form presents a potential solution to ameliorate water deficit stress. We attempt here a detailed dissection of electron transport in Photosystem II (PSII) through studies on chlorophyll a fast fluorescence kinetics and non-photochemical quenching (NPQ) and pigment dynamics in response to water stress. We also investigated the possible changes in these processes and the regulation of it by Zn Nano and Zn Ethylenediaminetetraacetic acid (EDTA) foliar sprays that may lead to amelioration of stress. Our results indicated that water stress created a "traffic jam" like situation in the electron transport system of Photosystem II, leading to decreased photosynthetic efficiency. Treatments with water deficit stress + Zn Nano (particle size < 90 nm) spray with Zn concentration at 20 mg L −1 and water deficit stress + Zn EDTA spray (solid material size ∼ 100 µm) with Zn concentration at 240 mg L −1 effectively ameliorated water deficit stress by its action on flux ratio parameters viz., quantum yield for electron transport (φ E0 ), probability of electron transport beyond Q A (ψ 0 ) and quantum yield of electron transport from Q A ⁻ to PS1 end electron acceptors (ϕ R0 ) and also the specific fluxes and phenomenological fluxes. These treatments positively influenced chlorophyll content, and xanthophyll components, including violaxanthin, antheraxanthin, and zeaxanthin, and reduced NPQ and the de expoxidation state. Higher concentrations of Zn Nano foliar spray (water stress + Zn Nano spray Zn @ 30 mg L⁻¹) did not ameliorate water deficit stress as effectively as the lower concentrations, although this higher concentration was not in any way toxic. This lack of stress amelioration at higher concentrations of Zn Nano spray may be due to physiological limitations of elemental zinc action within the plant. Our findings suggest that Zn foliar sprays in Nano and EDTA form at optimum concentrations can significantly improve plant resilience to water stress.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by-nc-nd. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 8
Claim · model-written summary
Water stress impaired PSII electron transport and reduced photosynthetic efficiency.
- Taxon
- pearl millet
Cenchrus americanust0 - Treatment
- water stresse0
- Outcome
- photosynthetic efficiencye0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Our results indicated that water stress created a "traffic jam" like situation in the electron transport system of Photosystem II, leading to decreased photosynthetic efficiency.”
t0“pearl millet (Pennisetum glaucum (L.) R. Br.)”
Claim · model-written summary
water deficit stress + Zn Nano (particle size < 90 nm) spray with Zn concentration at 20 mg L −1 ameliorated water stress effects on PSII flux parameters.
- Taxon
- pearl milletCenchrus americanust0
- Treatment
- water deficit stress + Zn Nano (particle size < 90 nm) spray with Zn concentration at 20 mg L −1e0
- Outcome
- quantum yield for electron transport (φ E0 ), probability of electron transport beyond Q A (ψ 0 ) and quantum yield of electron transport from Q A ⁻ to PS1 end electron acceptors (ϕ R0 )e0
- Direction
- amelioratede0
- Comparator
- water deficit stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Treatments with water deficit stress + Zn Nano (particle size < 90 nm) spray with Zn concentration at 20 mg L −1 and water deficit stress + Zn EDTA spray (solid material size ∼ 100 µm) with Zn concentration at 240 mg L −1 effectively ameliorated water deficit stress by its action on flux ratio parameters viz., quantum yield for electron transport (φ E0 ), probability of electron transport beyond Q A (ψ 0 ) and quantum yield of electron transport from Q A ⁻ to PS1 end electron acceptors (ϕ R0 ) and also the specific fluxes and phenomenological fluxes.”
t0“pearl millet (Pennisetum glaucum (L.) R. Br.)”
Claim · model-written summary
water deficit stress + Zn EDTA spray (solid material size ∼ 100 µm) with Zn concentration at 240 mg L −1 ameliorated water stress effects on PSII flux parameters.
- Taxon
- pearl milletCenchrus americanust0
- Treatment
- water deficit stress + Zn EDTA spray (solid material size ∼ 100 µm) with Zn concentration at 240 mg L −1e0
- Outcome
- quantum yield for electron transport (φ E0 ), probability of electron transport beyond Q A (ψ 0 ) and quantum yield of electron transport from Q A ⁻ to PS1 end electron acceptors (ϕ R0 )e0
- Direction
- amelioratede0
- Comparator
- water deficit stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Treatments with water deficit stress + Zn Nano (particle size < 90 nm) spray with Zn concentration at 20 mg L −1 and water deficit stress + Zn EDTA spray (solid material size ∼ 100 µm) with Zn concentration at 240 mg L −1 effectively ameliorated water deficit stress by its action on flux ratio parameters viz., quantum yield for electron transport (φ E0 ), probability of electron transport beyond Q A (ψ 0 ) and quantum yield of electron transport from Q A ⁻ to PS1 end electron acceptors (ϕ R0 ) and also the specific fluxes and phenomenological fluxes.”
t0“pearl millet (Pennisetum glaucum (L.) R. Br.)”
Claim · model-written summary
The zinc treatments positively influenced chlorophyll and xanthophyll pigments.
- Taxon
- pearl milletCenchrus americanust0
- Treatment
- These treatmentse0
- Outcome
- chlorophyll content, and xanthophyll componentse0
- Direction
- positively influencede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These treatments positively influenced chlorophyll content, and xanthophyll components, including violaxanthin, antheraxanthin, and zeaxanthin, and reduced NPQ and the de expoxidation state.”
t0“pearl millet (Pennisetum glaucum (L.) R. Br.)”
Claim · model-written summary
The zinc treatments reduced NPQ and de-epoxidation state.
- Taxon
- pearl milletCenchrus americanust0
- Treatment
- These treatmentse0
- Outcome
- NPQ and the de expoxidation statee0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These treatments positively influenced chlorophyll content, and xanthophyll components, including violaxanthin, antheraxanthin, and zeaxanthin, and reduced NPQ and the de expoxidation state.”
t0“pearl millet (Pennisetum glaucum (L.) R. Br.)”
Claim · model-written summary
Zn Nano at 30 mg L⁻¹ ameliorated water stress less effectively than lower concentrations.
- Taxon
- pearl milletCenchrus americanust0
- Treatment
- water stress + Zn Nano spray Zn @ 30 mg L⁻¹e0
- Outcome
- ameliorate water deficit stresse0
- Direction
- not ameliorate water deficit stress as effectivelye0
- Comparator
- lower concentrationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Higher concentrations of Zn Nano foliar spray (water stress + Zn Nano spray Zn @ 30 mg L⁻¹) did not ameliorate water deficit stress as effectively as the lower concentrations, although this higher concentration was not in any way toxic.”
t0“pearl millet (Pennisetum glaucum (L.) R. Br.)”
Claim · model-written summary
The higher Zn Nano concentration was not toxic.
- Taxon
- pearl milletCenchrus americanust0
- Treatment
- water stress + Zn Nano spray Zn @ 30 mg L⁻¹e0
- Outcome
- not in any way toxice0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Higher concentrations of Zn Nano foliar spray (water stress + Zn Nano spray Zn @ 30 mg L⁻¹) did not ameliorate water deficit stress as effectively as the lower concentrations, although this higher concentration was not in any way toxic.”
t0“pearl millet (Pennisetum glaucum (L.) R. Br.)”
Claim · model-written summary
The authors recommend optimal Zn Nano and EDTA foliar sprays to improve water stress resilience.
- Taxon
- pearl milletCenchrus americanust0
- Outcome
- Zn foliar sprays in Nano and EDTA form at optimum concentrations can significantly improve plant resilience to water stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Our findings suggest that Zn foliar sprays in Nano and EDTA form at optimum concentrations can significantly improve plant resilience to water stress.”
t0“pearl millet (Pennisetum glaucum (L.) R. Br.)”
The same questions in other papers
zinc atom · physiology: photosynthesis · Cenchrus americanus (pearl millet)Results agree
1 paper in the same direction as this paper
- positive
ethylenediaminetetraacetic acid · physiology: photosynthesis · Cenchrus americanus (pearl millet)Results agree
1 paper in the same direction as this paper
- positive
drought · physiology: photosynthesis · Cenchrus americanus (pearl millet)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
- 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.