Abstract
BACKGROUND: Super absorbent polymers (SAP) have been studied as soil amendments in arid and semi-arid environments, but little is known about potential use for drought stress mitigation in different soil textures. OBJECTIVES: The objective of this survey was to evaluate the role of SAP under drought stress condition on antioxidant enzymes and Corn crop production. METHODS: Current research arranged in split-split plot experiment based on completely randomized block design with three replications. The primary plots included different types of soil, including sandy and clay-loam. The subplots were categorized into three levels of drought stress, 80, 100 and 120 mm of evaporation from the pan which is named severe drought stress, mild drought stress and well-watered conditions, respectively. Five value of SAP including 0, 10, 20, 40, and 80 kg.ha-1 were applied as the sub-subsidiary factor. RESULT: The results illustrated that drought caused a significant decrease in net photosynthesis rate, leaf stomatal conductance, chlorophyll (Chl.) a+b, relative water content (RWC), plant height, and grain yield of Maize. Catalase (CAT), Super oxide dismutase (SOD), Ascorbate peroxidase (APX), Relative electrolyte conductivity (REC), and proline were significantly elevated with increase in drought stress level. Relative to the control treatment, the moderate and severe drought conditions increased water use efficiency (WUE) on average by 5.8 and 11.7%, respectively. The maximum value of grain yield (491.8 g) was recorded for clay-loam soil texture. Applying SAP under drought condition enhanced the leaf gas exchange parameters, total chlorophyll, RWC, plant height, and grain yield, while it decreased REC, proline content, CAT, SOD, and APX activity. The highest and lowest Net photosynthesis rate, leaf stomatal conductance and Chl. a+b contents were related to amounts of 80 and 10 kg.ha-1 SAP respectively. A significant increase in leaf relative water content was observed with application of 40 and 80 kg.ha-1 SAP whilst the lower amounts (10 and 20 kg.ha-1 SAP) had no significant impact on the parameter in compared with control (0 kg.ha-1 SAP). CONCLUSION: Finally recommend using SAP at a dose of 80 kg.ha-1 for dealing with drought conditions in the sandy and clay-loam soils.
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Claims 11
Claim · model-written summary
Drought decreased maize photosynthesis, stomatal conductance, chlorophyll, relative water content, height and yield.
- Treatment
- droughte0
- Outcome
- net photosynthesis rate, leaf stomatal conductance, chlorophyll (Chl.) a+b, relative water content (RWC), plant height, and grain yielde0
- Direction
- decreasee0
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“drought caused a significant decrease in net photosynthesis rate, leaf stomatal conductance, chlorophyll (Chl.) a+b, relative water content (RWC), plant height, and grain yield of Maize”
Claim · model-written summary
Increasing drought elevated CAT, SOD, APX, REC and proline.
- Treatment
- drought stress levele0
- Outcome
- Catalase (CAT), Super oxide dismutase (SOD), Ascorbate peroxidase (APX), Relative electrolyte conductivity (REC), and prolinee0
- Direction
- elevatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Catalase (CAT), Super oxide dismutase (SOD), Ascorbate peroxidase (APX), Relative electrolyte conductivity (REC), and proline were significantly elevated with increase in drought stress level.”
t0“Zea mays L.”
Claim · model-written summary
Moderate drought increased WUE by 5.8% relative to control.
- Treatment
- moderatee0
- Outcome
- water use efficiency (WUE)e0
- Direction
- increasede0
- Value
- 5.8e0
- Comparator
- control treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Relative to the control treatment, the moderate and severe drought conditions increased water use efficiency (WUE) on average by 5.8 and 11.7%, respectively.”
t0“Zea mays L.”
Claim · model-written summary
Severe drought increased WUE by 11.7% relative to control.
- Treatment
- severe drought conditionse0
- Outcome
- water use efficiency (WUE)e0
- Direction
- increasede0
- Value
- 11.7%e0
- Comparator
- control treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Relative to the control treatment, the moderate and severe drought conditions increased water use efficiency (WUE) on average by 5.8 and 11.7%, respectively.”
t0“Zea mays L.”
Claim · model-written summary
Clay-loam soil produced the maximum grain yield of 491.8 g.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The maximum value of grain yield (491.8 g) was recorded for clay-loam soil texture.”
t0“Zea mays L.”
Claim · model-written summary
SAP under drought enhanced gas exchange, chlorophyll, water content, height and grain yield.
- Treatment
- SAPe0
- Outcome
- leaf gas exchange parameters, total chlorophyll, RWC, plant height, and grain yielde0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Applying SAP under drought condition enhanced the leaf gas exchange parameters, total chlorophyll, RWC, plant height, and grain yield”
t0“Zea mays L.”
Claim · model-written summary
SAP under drought decreased REC, proline, CAT, SOD and APX activity.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“it decreased REC, proline content, CAT, SOD, and APX activity.”
e2“Applying SAP under drought condition enhanced the leaf gas exchange parameters, total chlorophyll, RWC, plant height, and grain yield”
t0“Zea mays L.”
Claim · model-written summary
The 80 kg.ha-1 SAP rate gave the highest photosynthesis, stomatal conductance and chlorophyll, and 10 kg.ha-1 gave the lowest.
- Treatment
- 80 and 10 kg.ha-1 SAPe0
- Outcome
- Net photosynthesis rate, leaf stomatal conductance and Chl. a+b contentse0
- Direction
- highest and loweste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest and lowest Net photosynthesis rate, leaf stomatal conductance and Chl. a+b contents were related to amounts of 80 and 10 kg.ha-1 SAP respectively.”
t0“Zea mays L.”
Claim · model-written summary
SAP at 40 and 80 kg.ha-1 increased leaf relative water content.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A significant increase in leaf relative water content was observed with application of 40 and 80 kg.ha-1 SAP”
t0“Zea mays L.”
Claim · model-written summary
SAP at 10 and 20 kg.ha-1 had no significant effect on leaf relative water content versus control.
- Treatment
- 10 and 20 kg.ha-1 SAPe0
- Outcome
- the parametere0
- Direction
- no significant impacte0
- Comparator
- control (0 kg.ha-1 SAP)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the lower amounts (10 and 20 kg.ha-1 SAP) had no significant impact on the parameter in compared with control (0 kg.ha-1 SAP).”
t0“Zea mays L.”
Claim · model-written summary
The authors recommend 80 kg.ha-1 SAP for drought in sandy and clay-loam soils.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“recommend using SAP at a dose of 80 kg.ha-1 for dealing with drought conditions in the sandy and clay-loam soils.”
t0“Zea mays L.”
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