Abstract
The detrimental effects of drought stress on the growth, productivity, and quality of tobacco ( Nicotiana tabacum L.) underscore the necessity of identifying drought-tolerant germplasm for breeding programs. This study evaluated the drought tolerance of 295 tobacco genotypes, primarily from East Asia and North America. A preliminary screening involved withholding water until soil moisture reached 6%, followed by assessment of various morphological and physiological traits from which an integrated score was calculated. Considerable genetic diversity was found among the genotypes with respect to drought tolerance, leading to the identification of 16 tolerant and 6 sensitive genotypes. The drought tolerance of these 22 genotypes were validated in a subsequent pot experiment, confirming the preliminary screen. Most drought-tolerant genotypes were Chinese landraces, with T218 (An Shun Da Diao Zhi Bian Zhong) identified as the most tolerant and T180 (Long She Yan) as the most sensitive; both are Chinese landraces. Further analysis showed that under well-watered conditions, T218 and T180 had similar agronomic traits, with T180 had slightly superior photosynthetic performance at the seedlings stage. Under drought stress, T218 exhibited less growth inhibition, higher antioxidant enzyme activities, greater glutathione (GSH) accumulation, and lower malondialdehyde (MDA) levels compared to T180. The findings of this study have identified valuable germplasm for the genetic improvement of drought tolerance in tobacco and material that will facilitate a better understanding of the effects of drought on the regulation of metabolism, physiology, and biochemistry.
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Claims 13
Claim · model-written summary
Considerable genetic diversity exists among tobacco genotypes for drought tolerance
- Taxon
- tobacco
Nicotiana tabacumt0 - Outcome
- genetic diversitye1
- Qualifier
- with respect to drought tolerancee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tobacco genotypes”
e1“Considerable genetic diversity was found among the genotypes with respect to drought tolerance”
Claim · model-written summary
Sixteen drought-tolerant tobacco genotypes were identified
- Taxon
- tobaccoNicotiana tabacumt0
- Outcome
- identification of 16 tolerante2
- Value
- 16e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tobacco genotypes”
e2“leading to the identification of 16 tolerant and 6 sensitive genotypes”
Claim · model-written summary
Six drought-sensitive tobacco genotypes were identified
- Taxon
- tobaccoNicotiana tabacumt0
- Outcome
- and 6 sensitive genotypese2
- Value
- 6e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tobacco genotypes”
e2“leading to the identification of 16 tolerant and 6 sensitive genotypes”
Claim · model-written summary
Drought tolerance of the 22 selected genotypes was confirmed in a pot experiment
- Taxon
- tobaccoNicotiana tabacumt0
- Outcome
- drought tolerancee3
- Qualifier
- confirming the preliminary screene3
- Setting
- pot experimente3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tobacco genotypes”
e3“The drought tolerance of these 22 genotypes were validated in a subsequent pot experiment, confirming the preliminary screen”
Claim · model-written summary
Most drought-tolerant tobacco genotypes are Chinese landraces
- Taxon
- tobaccoNicotiana tabacumt0
- Material
- Chinese landracese4
- Outcome
- drought-tolerant genotypese4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tobacco genotypes”
e4“Most drought-tolerant genotypes were Chinese landraces”
Claim · model-written summary
T218 was identified as the most drought-tolerant genotype
- Taxon
- tobaccoNicotiana tabacumt0
- Material
- T218 (An Shun Da Diao Zhi Bian Zhong)e5
- Outcome
- identified as the most tolerante5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tobacco genotypes”
e5“T218 (An Shun Da Diao Zhi Bian Zhong) identified as the most tolerant”
Claim · model-written summary
T180 was identified as the most drought-sensitive genotype
- Taxon
- tobaccoNicotiana tabacumt0
- Material
- T180 (Long She Yan)e6
- Outcome
- the most sensitivee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tobacco genotypes”
e6“T180 (Long She Yan) as the most sensitive”
Claim · model-written summary
Under well-watered conditions, T218 and T180 had similar agronomic traits
- Taxon
- tobaccoNicotiana tabacumt0
- Material
- T218 and T180e7
- Outcome
- agronomic traitse7
- Qualifier
- under well-watered conditionse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tobacco genotypes”
e7“under well-watered conditions, T218 and T180 had similar agronomic traits”
Claim · model-written summary
Under well-watered conditions, T180 had slightly superior photosynthetic performance at the seedling stage
- Taxon
- tobaccoNicotiana tabacumt0
- Material
- T180e1
- Organ / stage
- seedlings stagee1
- Outcome
- photosynthetic performancee1
- Qualifier
- slightly superiore1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tobacco genotypes”
e1“T180 had slightly superior photosynthetic performance at the seedlings stage”
Claim · model-written summary
Under drought stress, T218 showed less growth inhibition than T180
- Taxon
- tobaccoNicotiana tabacumt0
- Material
- T218e1
- Treatment
- drought stresse1
- Outcome
- growth inhibitione1
- Direction
- lesse1
- Comparator
- T180e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tobacco genotypes”
e1“Under drought stress, T218 exhibited less growth inhibition, higher antioxidant enzyme activities, greater glutathione (GSH) accumulation, and lower malondialdehyde (MDA) levels compared to T180”
Claim · model-written summary
Under drought stress, T218 showed higher antioxidant enzyme activities than T180
- Taxon
- tobaccoNicotiana tabacumt0
- Material
- T218e1
- Treatment
- drought stresse1
- Outcome
- antioxidant enzyme activitiese1
- Direction
- highere1
- Comparator
- T180e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tobacco genotypes”
e1“Under drought stress, T218 exhibited less growth inhibition, higher antioxidant enzyme activities, greater glutathione (GSH) accumulation, and lower malondialdehyde (MDA) levels compared to T180”
Claim · model-written summary
Under drought stress, T218 accumulated more glutathione than T180
- Taxon
- tobaccoNicotiana tabacumt0
- Material
- T218e1
- Treatment
- drought stresse1
- Outcome
- glutathione (GSH) accumulatione1
- Direction
- greatere1
- Comparator
- T180e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tobacco genotypes”
e1“Under drought stress, T218 exhibited less growth inhibition, higher antioxidant enzyme activities, greater glutathione (GSH) accumulation, and lower malondialdehyde (MDA) levels compared to T180”
Claim · model-written summary
Under drought stress, T218 had lower malondialdehyde levels than T180
- Taxon
- tobaccoNicotiana tabacumt0
- Material
- T218e1
- Treatment
- drought stresse1
- Outcome
- malondialdehyde (MDA) levelse1
- Direction
- lowere1
- Comparator
- T180e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tobacco genotypes”
e1“Under drought stress, T218 exhibited less growth inhibition, higher antioxidant enzyme activities, greater glutathione (GSH) accumulation, and lower malondialdehyde (MDA) levels compared to T180”
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