Abstract
Drought is one of the major threats to groundnut productivity, causing a greater loss than any other abiotic factor. Water stress conditions alter plant photosynthetic activity, impacting future growth and assimilating mobilization towards sink tissues. The purpose of this study was to investigate how drought impacts the photosynthesis of plants and its links to drought tolerance. The influence of reproductive stage drought on photosynthetic activity and chlorophyll fluorescence of groundnut is well studied. The experiment was conducted in Kharif 2019 (Jul-Sep), where recent series in groundnut genotypes (60 nos) sown under rainfed conditions and water stress was created by withholding irrigation for 20 days between 35-55 days after sowing in the field to simulate drought conditions. Imposition of water deficit stress reduced PS II efficiency, which significantly altered the photosynthetic rate in the leaf. Observation of gas exchange parameters viz., photosynthetic rate, stomatal conductance and transpiration rate after 20 days of stress imposition revealed that of all 60 genotypes, 20 genotypes (VG 17008, VG 17046VG 18005, VG 18102, VG 18077, VG 19572, VG 19709, VG 18111, VG19561, VG19576, VG 19620, VG 19681, VG 19688, etc.,) had better Photosynthetic rate, Stomatal conductance. Similarly, PS II efficiency analyzed through fluorescence meter revealed that among the 60 and all the genotypes given above recorded higher value in Fv/Fm. Results obtained from Cluster analysis and PCA confirmed that photosynthetic rate and Fv/Fm is useful parameter in screening adapted cultivars under drought stress. These findings lay the groundwork for a future study to decipher the molecular pathways underpinning groundnut drought resistance.
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Claims 5
Claim · model-written summary
Water deficit reduced groundnut PS II efficiency.
- Taxon
- groundnut
Arachis hypogaeat0 - Treatment
- water deficit stresse0
- Outcome
- PS II efficiencye0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Imposition of water deficit stress reduced PS II efficiency”
t0“groundnut”
Claim · model-written summary
Water deficit significantly altered groundnut leaf photosynthetic rate.
- Taxon
- groundnutArachis hypogaeat0
- Treatment
- water deficit stresse0
- Outcome
- photosynthetic rate in the leafe0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Imposition of water deficit stress reduced PS II efficiency, which significantly altered the photosynthetic rate in the leaf.”
t0“groundnut”
Claim · model-written summary
Twenty of 60 groundnut genotypes had better photosynthetic rate and stomatal conductance under stress.
- Taxon
- groundnutArachis hypogaeat0
- Outcome
- Photosynthetic rate, Stomatal conductancee0
- Direction
- bettere0
- Value
- 20 genotypese0
- Qualifier
- of all 60 genotypese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“of all 60 genotypes, 20 genotypes (VG 17008, VG 17046VG 18005, VG 18102, VG 18077, VG 19572, VG 19709, VG 18111, VG19561, VG19576, VG 19620, VG 19681, VG 19688, etc.,) had better Photosynthetic rate, Stomatal conductance.”
t0“groundnut”
Claim · model-written summary
Those groundnut genotypes had higher Fv/Fm than other genotypes.
- Taxon
- groundnutArachis hypogaeat0
- Outcome
- Fv/Fme0
- Direction
- highere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“among the 60 and all the genotypes given above recorded higher value in Fv/Fm.”
t0“groundnut”
Claim · model-written summary
Cluster analysis and PCA supported photosynthetic rate and Fv/Fm as screening parameters for drought adapted cultivars.
- Taxon
- groundnutArachis hypogaeat0
- Outcome
- useful parameter in screening adapted cultivars under drought stresse0
- Qualifier
- photosynthetic rate and Fv/Fme0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Results obtained from Cluster analysis and PCA confirmed that photosynthetic rate and Fv/Fm is useful parameter in screening adapted cultivars under drought stress.”
t0“groundnut”
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