Abstract
Okra [ Abelmoschus esculentus (L.) Moench] plays a vital role in ensuring food and nutritional security in arid and semi-arid regions; however, its growth is severely limited by drought stress. While root plasticity and physio-biochemical responses are known to contribute to drought resilience, their specific roles in okra remain underexplored. This study assessed drought tolerance in 55 okra genotypes subjected to three levels of PEG 6000-induced osmotic stress (0%, 10%, and 20%) under polyhouse conditions. Drought stress delayed germination and significantly reduced key growth parameters, including leaf number, shoot length, fresh and dry biomass, and survival rate. Root traits such as secondary root number, root length, and fresh root weight also declined, although the root-to-shoot ratio increased under severe stress, indicating an adaptive shift in biomass allocation. Biochemical analyses revealed elevated levels of chlorophyll, carotenoids, and proline in response to drought, reflecting enhanced stress tolerance mechanisms. Based on overall performance, genotypes G51 (Sonam), G6 (HAU-480), G10 (Bhindi Champion), and G45 (Pooja-01) emerged as the most drought-tolerant, exhibiting superior root development and biomass accumulation. Oxidative stress markers, MDA and H 2 O 2 , also increased significantly under severe drought, further validating physiological damage and supporting the classification of tolerant and susceptible genotypes. Principal component analysis identified the mean productivity index and tolerance index as key contributors to genotypic variation under stress. Additionally, Field Emission Scanning Electron Microscopy (FESEM) revealed genotype-specific xylem adaptations, with reduced vessel size in drought-tolerant genotypes likely mitigating the risk of embolism. These findings highlight the importance of root plasticity, xylem architecture, and biochemical adjustments in conferring drought tolerance in okra. Prioritizing traits such as secondary root formation and reduced xylem vessel size offers promising avenues for breeding resilient okra cultivars suited to water-limited environments.
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Claims 16
Claim · model-written summary
Drought stress delayed germination of okra under PEG 6000-induced osmotic stress.
- Taxon
- Abelmoschus esculentus
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Abelmoschus esculentuse0 - Material
- 55 okra genotypese2
- Treatment
- PEG 6000-induced osmotic stresse2
- Outcome
- germinatione1
- Direction
- delayede1
- Comparator
- 0%e2
- Setting
- polyhouse conditionse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Okra [ Abelmoschus esculentus (L.) Moench]”
e1“Drought stress delayed germination”
e2“55 okra genotypes subjected to three levels of PEG 6000-induced osmotic stress (0%, 10%, and 20%) under polyhouse conditions”
Claim · model-written summary
Drought stress significantly reduced leaf number, shoot length, and fresh and dry biomass of okra.
- Taxon
- Abelmoschus esculentusAbelmoschus esculentuse0
- Material
- 55 okra genotypese2
- Treatment
- PEG 6000-induced osmotic stresse2
- Outcome
- leaf number, shoot length, fresh and dry biomasse1
- Direction
- reducede1
- Comparator
- 0%e2
- Setting
- polyhouse conditionse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Okra [ Abelmoschus esculentus (L.) Moench]”
e1“significantly reduced key growth parameters, including leaf number, shoot length, fresh and dry biomass, and survival rate”
e2“55 okra genotypes subjected to three levels of PEG 6000-induced osmotic stress (0%, 10%, and 20%) under polyhouse conditions”
Claim · model-written summary
Drought stress significantly reduced survival rate of okra.
- Taxon
- Abelmoschus esculentusAbelmoschus esculentuse0
- Material
- 55 okra genotypese2
- Treatment
- PEG 6000-induced osmotic stresse2
- Outcome
- survival ratee1
- Direction
- reducede1
- Comparator
- 0%e2
- Setting
- polyhouse conditionse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Okra [ Abelmoschus esculentus (L.) Moench]”
e1“significantly reduced key growth parameters, including leaf number, shoot length, fresh and dry biomass, and survival rate”
e2“55 okra genotypes subjected to three levels of PEG 6000-induced osmotic stress (0%, 10%, and 20%) under polyhouse conditions”
Claim · model-written summary
Drought stress reduced secondary root number, root length, and fresh root weight of okra.
- Taxon
- Abelmoschus esculentusAbelmoschus esculentuse0
- Material
- 55 okra genotypese2
- Treatment
- PEG 6000-induced osmotic stresse2
- Outcome
- secondary root number, root length, and fresh root weighte3
- Direction
- declinede3
- Comparator
- 0%e2
- Setting
- polyhouse conditionse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Okra [ Abelmoschus esculentus (L.) Moench]”
e2“55 okra genotypes subjected to three levels of PEG 6000-induced osmotic stress (0%, 10%, and 20%) under polyhouse conditions”
e3“Root traits such as secondary root number, root length, and fresh root weight also declined”
Claim · model-written summary
The root-to-shoot ratio of okra increased under severe stress.
- Taxon
- Abelmoschus esculentusAbelmoschus esculentuse0
- Material
- 55 okra genotypese2
- Treatment
- severe stresse4
- Outcome
- root-to-shoot ratioe4
- Direction
- increasede4
- Comparator
- 0%e2
- Setting
- polyhouse conditionse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Okra [ Abelmoschus esculentus (L.) Moench]”
e2“55 okra genotypes subjected to three levels of PEG 6000-induced osmotic stress (0%, 10%, and 20%) under polyhouse conditions”
e4“although the root-to-shoot ratio increased under severe stress”
Claim · model-written summary
Chlorophyll, carotenoids, and proline were elevated in okra under drought.
- Taxon
- Abelmoschus esculentusAbelmoschus esculentuse0
- Material
- 55 okra genotypese2
- Treatment
- droughte5
- Outcome
- chlorophyll, carotenoids, and prolinee5
- Direction
- elevatede5
- Comparator
- 0%e2
- Setting
- polyhouse conditionse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Okra [ Abelmoschus esculentus (L.) Moench]”
e2“55 okra genotypes subjected to three levels of PEG 6000-induced osmotic stress (0%, 10%, and 20%) under polyhouse conditions”
e5“Biochemical analyses revealed elevated levels of chlorophyll, carotenoids, and proline in response to drought”
Claim · model-written summary
Genotype G51 (Sonam) emerged as among the most drought-tolerant okra genotypes, with superior root development and biomass accumulation.
- Taxon
- Abelmoschus esculentusAbelmoschus esculentuse0
- Material
- G51 (Sonam)e6
- Outcome
- most drought-tolerante6
- Qualifier
- superior root development and biomass accumulatione6
- Setting
- polyhouse conditionse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Okra [ Abelmoschus esculentus (L.) Moench]”
e2“55 okra genotypes subjected to three levels of PEG 6000-induced osmotic stress (0%, 10%, and 20%) under polyhouse conditions”
e6“genotypes G51 (Sonam), G6 (HAU-480), G10 (Bhindi Champion), and G45 (Pooja-01) emerged as the most drought-tolerant, exhibiting superior root development and biomass accumulation”
Claim · model-written summary
Genotype G6 (HAU-480) emerged as among the most drought-tolerant okra genotypes, with superior root development and biomass accumulation.
- Taxon
- Abelmoschus esculentusAbelmoschus esculentuse0
- Material
- G6 (HAU-480)e6
- Outcome
- most drought-tolerante6
- Qualifier
- superior root development and biomass accumulatione6
- Setting
- polyhouse conditionse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Okra [ Abelmoschus esculentus (L.) Moench]”
e2“55 okra genotypes subjected to three levels of PEG 6000-induced osmotic stress (0%, 10%, and 20%) under polyhouse conditions”
e6“genotypes G51 (Sonam), G6 (HAU-480), G10 (Bhindi Champion), and G45 (Pooja-01) emerged as the most drought-tolerant, exhibiting superior root development and biomass accumulation”
Claim · model-written summary
Genotype G10 (Bhindi Champion) emerged as among the most drought-tolerant okra genotypes, with superior root development and biomass accumulation.
- Taxon
- Abelmoschus esculentusAbelmoschus esculentuse0
- Material
- G10 (Bhindi Champion)e6
- Outcome
- most drought-tolerante6
- Qualifier
- superior root development and biomass accumulatione6
- Setting
- polyhouse conditionse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Okra [ Abelmoschus esculentus (L.) Moench]”
e2“55 okra genotypes subjected to three levels of PEG 6000-induced osmotic stress (0%, 10%, and 20%) under polyhouse conditions”
e6“genotypes G51 (Sonam), G6 (HAU-480), G10 (Bhindi Champion), and G45 (Pooja-01) emerged as the most drought-tolerant, exhibiting superior root development and biomass accumulation”
Claim · model-written summary
Genotype G45 (Pooja-01) emerged as among the most drought-tolerant okra genotypes, with superior root development and biomass accumulation.
- Taxon
- Abelmoschus esculentusAbelmoschus esculentuse0
- Material
- G45 (Pooja-01)e6
- Outcome
- most drought-tolerante6
- Qualifier
- superior root development and biomass accumulatione6
- Setting
- polyhouse conditionse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Okra [ Abelmoschus esculentus (L.) Moench]”
e2“55 okra genotypes subjected to three levels of PEG 6000-induced osmotic stress (0%, 10%, and 20%) under polyhouse conditions”
e6“genotypes G51 (Sonam), G6 (HAU-480), G10 (Bhindi Champion), and G45 (Pooja-01) emerged as the most drought-tolerant, exhibiting superior root development and biomass accumulation”
Claim · model-written summary
MDA and H2O2 increased significantly in okra under severe drought.
- Taxon
- Abelmoschus esculentusAbelmoschus esculentuse0
- Material
- 55 okra genotypese2
- Treatment
- severe droughte7
- Outcome
- MDA and H 2 O 2e7
- Direction
- increasede7
- Comparator
- 0%e2
- Setting
- polyhouse conditionse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Okra [ Abelmoschus esculentus (L.) Moench]”
e2“55 okra genotypes subjected to three levels of PEG 6000-induced osmotic stress (0%, 10%, and 20%) under polyhouse conditions”
e7“Oxidative stress markers, MDA and H 2 O 2 , also increased significantly under severe drought”
Claim · model-written summary
The mean productivity index and tolerance index were the key contributors to genotypic variation of okra under stress.
- Taxon
- Abelmoschus esculentusAbelmoschus esculentuse0
- Treatment
- stresse3
- Outcome
- genotypic variatione3
- Qualifier
- mean productivity index and tolerance indexe3
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Okra [ Abelmoschus esculentus (L.) Moench]”
e3“Principal component analysis identified the mean productivity index and tolerance index as key contributors to genotypic variation under stress”
Claim · model-written summary
Field Emission Scanning Electron Microscopy revealed genotype-specific xylem adaptations in okra.
- Taxon
- Abelmoschus esculentusAbelmoschus esculentuse0
- Organ / stage
- xyleme3
- Outcome
- xylem adaptationse3
- Qualifier
- genotype-specifice3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Okra [ Abelmoschus esculentus (L.) Moench]”
e3“Field Emission Scanning Electron Microscopy (FESEM) revealed genotype-specific xylem adaptations”
Claim · model-written summary
Reduced vessel size occurred in drought-tolerant okra genotypes.
- Taxon
- Abelmoschus esculentusAbelmoschus esculentuse0
- Material
- drought-tolerant genotypese3
- Outcome
- vessel sizee3
- Direction
- reducede3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Okra [ Abelmoschus esculentus (L.) Moench]”
e3“reduced vessel size in drought-tolerant genotypes likely mitigating the risk of embolism”
Claim · model-written summary
Reduced vessel size is likely to mitigate the risk of embolism in okra.
- Taxon
- Abelmoschus esculentusAbelmoschus esculentuse0
- Outcome
- risk of embolisme3
- Qualifier
- reduced vessel sizee3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Okra [ Abelmoschus esculentus (L.) Moench]”
e3“reduced vessel size in drought-tolerant genotypes likely mitigating the risk of embolism”
Claim · model-written summary
Prioritizing secondary root formation and reduced xylem vessel size is suggested for breeding resilient okra cultivars for water-limited environments.
- Taxon
- okraAbelmoschus esculentuse3
- Outcome
- secondary root formation and reduced xylem vessel sizee3
- Setting
- water-limited environmentse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Okra [ Abelmoschus esculentus (L.) Moench]”
e3“Prioritizing traits such as secondary root formation and reduced xylem vessel size offers promising avenues for breeding resilient okra cultivars suited to water-limited environments”
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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.