Abstract
Salinity is one of the abiotic stresses that affect crop growth and productivity in arid and semi-arid regions. Unfortunately, there are few known methods to mitigate the deleterious impacts of salt stress on the development and yield of vegetable crops. Blue-green algae (cyanobacteria) are endowed with the potential to curb the negative impacts of salt stress as they are characterized by biostimulant properties. The present work aimed to investigate the effects of Roholtiella sp. as a foliar extract on the growth characteristics, physiological and biochemical responses of bell pepper (Capsicum annuum L.) plants under varying levels of salinity conditions. A soilless water experiment was carried out in a greenhouse where bell pepper seedlings were grown under five salt concentrations (0, 50, 200, 150, and 200 mM of NaCl). Growth characteristics, pigments content, relative water content, and antioxidant activity (CAT) were determined. Our results showed that growth parameters, relative water content (RWC), chlorophyll a & b concentrations under salinity conditions were negatively affected at the highest concentration (200 mM). Interestingly, the application of Roholtiella sp. foliar extract enhanced the plant growth characteristics as shoot length increased by 17.014%, fresh weight by 39.15%, dry and weight by 31.02%, at various salt treatments. Moreover, chlorophyll a and b increased significantly compared with seedlings sprayed with water. Similarly, RWC exhibited a significant increase (92.05%) compared with plants sprayed with water. In addition, antioxidants activities and accumulation of proline were improved in Roholtella sp. extract foliar sprayed seedlings compared to the plants foliar sprayed with water. Conclusively, at the expiration of our study, the Rohotiella sp. extract-treated plants were found to be more efficient in mitigating the deleterious effects caused by the salinity conditions which is an indication of an enhancement potential of tolerating salt-stressed plants when compared to the control group.
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Claims 7
Claim · model-written summary
High salinity reduced growth, water content, and chlorophyll.
- Taxon
- Bell Peppert0
- Treatment
- highest concentration (200 mM)e0
- Outcome
- growth parameters, relative water content (RWC), chlorophyll a & b concentrationse0
- Direction
- negatively affectede0
Not reportedComparator
Verbatim
e0“growth parameters, relative water content (RWC), chlorophyll a & b concentrations under salinity conditions were negatively affected at the highest concentration (200 mM).”
t0“Bell Pepper”
Claim · model-written summary
Foliar extract increased shoot length by 17.014%.
- Taxon
- Bell Peppert0
- Treatment
- Roholtiella sp. foliar extracte0
- Outcome
- shoot lengthe0
- Direction
- increasede0
- Value
- 17.014%e0
Not reportedComparator
Verbatim
e0“application of Roholtiella sp. foliar extract enhanced the plant growth characteristics as shoot length increased by 17.014%, fresh weight by 39.15%, dry and weight by 31.02%”
t0“Bell Pepper”
Claim · model-written summary
Foliar extract increased fresh weight by 39.15%.
- Taxon
- Bell Peppert0
- Treatment
- Roholtiella sp. foliar extracte0
- Outcome
- fresh weighte0
- Direction
- enhancede0
- Value
- 39.15%e0
Not reportedComparator
Verbatim
e0“application of Roholtiella sp. foliar extract enhanced the plant growth characteristics as shoot length increased by 17.014%, fresh weight by 39.15%, dry and weight by 31.02%”
t0“Bell Pepper”
Claim · model-written summary
Foliar extract increased dry weight by 31.02%.
- Taxon
- Bell Peppert0
- Treatment
- Roholtiella sp. foliar extracte0
- Outcome
- dry and weighte0
- Direction
- enhancede0
- Value
- 31.02%e0
Not reportedComparator
Verbatim
e0“application of Roholtiella sp. foliar extract enhanced the plant growth characteristics as shoot length increased by 17.014%, fresh weight by 39.15%, dry and weight by 31.02%”
t0“Bell Pepper”
Claim · model-written summary
Foliar extract significantly increased chlorophyll a and b.
- Taxon
- Bell Peppert0
- Outcome
- chlorophyll a and be0
- Direction
- increasede0
- Comparator
- seedlings sprayed with watere0
Not reportedTreatment
Verbatim
e0“chlorophyll a and b increased significantly compared with seedlings sprayed with water.”
t0“Bell Pepper”
Claim · model-written summary
Foliar extract increased relative water content by 92.05%.
Not reportedTreatment
Verbatim
e0“RWC exhibited a significant increase (92.05%) compared with plants sprayed with water.”
t0“Bell Pepper”
Claim · model-written summary
Foliar extract improved antioxidant activities and proline accumulation.
Verbatim
e0“antioxidants activities and accumulation of proline were improved in Roholtella sp. extract foliar sprayed seedlings compared to the plants foliar sprayed with water.”
t0“Bell Pepper”
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