Abstract
This study was conducted to determine genotypic variation among sorghum cultivars grown under similar ecological conditions for seed vigor, NaCl and drought stresses. A seedling survival test was also performed in a pod experiment to investigate genotypic differences in terms of sorghum drought tolerance. In seven sorghum cultivars, seed vigor was determined using electrical conductivity and accelerated aging tests, and germination rate and seedling growth of these cultivars were evaluated under salt (NaCl) and drought stress induced by PEG 6000 at water potentials of 0.0, 1.8, 3.6, 7.2 and 10.8 bar. The results showed that seed vigor differed among sorghum cultivars and the highest correlation coefficients were determined between laboratory emergence and accelerated aging (r=0.967**), and between germination and electrical conductivity (r=-0.873**). Electrical conductivity found a suitable test for determining germination potential of sorghum seed lots while the best method predicting emergence percentage was accelerated aging. Germination was delayed in both NaCl and PEG solutions. Germination, root length and shoot length were higher, whereas mean germination time was lower, in NaCl solution compared to in PEG solution at the same water potential. The most and least vigorous seeds were observed in the Akdari and Gozde 80 cultivars, which displayed the lowest germination percentages in NaCl and PEG solutions. From this study, it could be concluded that seed vigor is not a reliable indicator of germination performance under salt and drought stress conditions and that genetic differences may play an important role in stress tolerance.
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Claims 13
Claim · model-written summary
Seed vigor varied among sorghum cultivars.
SorghumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seed vigor differed among sorghum cultivars”
Claim · model-written summary
Laboratory emergence and accelerated aging had a correlation of r=0.967**.
Not reportedTaxonDirection
Verbatim
e0“the highest correlation coefficients were determined between laboratory emergence and accelerated aging (r=0.967**)”
Claim · model-written summary
Germination and electrical conductivity had a correlation of r=-0.873**.
Not reportedTaxonDirection
Verbatim
e0“between germination and electrical conductivity (r=-0.873**)”
Claim · model-written summary
Electrical conductivity was suitable for determining the germination potential of sorghum seed lots.
- Outcome
- germination potentiale0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Electrical conductivity found a suitable test for determining germination potential of sorghum seed lots”
Claim · model-written summary
Accelerated aging was the best method for predicting sorghum emergence percentage.
- Outcome
- emergence percentagee0
Not reportedTaxonComparatorValue
Verbatim
e0“the best method predicting emergence percentage was accelerated aging”
Claim · model-written summary
Germination was delayed in NaCl solution.
Not reportedTaxonComparator
Verbatim
e0“Germination was delayed in both NaCl and PEG solutions”
Claim · model-written summary
Germination was delayed in PEG solution.
Not reportedTaxonComparator
Verbatim
e0“Germination was delayed in both NaCl and PEG solutions”
Claim · model-written summary
At the same water potential, germination, root length and shoot length were higher in NaCl solution than in PEG solution.
- Treatment
- NaCl solutione0
- Outcome
- Germination, root length and shoot lengthe0
- Direction
- highere0
- Qualifier
- at the same water potentiale0
- Comparator
- PEG solutione0
Not reportedTaxon
Verbatim
e0“Germination, root length and shoot length were higher, whereas mean germination time was lower, in NaCl solution compared to in PEG solution at the same water potential”
Claim · model-written summary
At the same water potential, mean germination time was lower in NaCl solution than PEG solution.
- Treatment
- NaCl solutione0
- Outcome
- mean germination timee0
- Direction
- lowere0
- Qualifier
- at the same water potentiale0
- Comparator
- PEG solutione0
Not reportedTaxon
Verbatim
e0“mean germination time was lower, in NaCl solution compared to in PEG solution at the same water potential”
Claim · model-written summary
Akdari and Gozde 80 were identified as the most and least vigorous sorghum cultivars, respectively.
Not reportedTaxon
Verbatim
e0“The most and least vigorous seeds were observed in the Akdari and Gozde 80 cultivars”
Claim · model-written summary
Akdari and Gozde 80 displayed the lowest germination percentages under NaCl and PEG stress.
- Material
- Akdari and Gozde 80 cultivarse0
- Treatment
- NaCl and PEG solutionse0
- Outcome
- germination percentagese0
- Direction
- loweste0
Not reportedTaxon
Verbatim
e0“the Akdari and Gozde 80 cultivars, which displayed the lowest germination percentages in NaCl and PEG solutions”
Claim · model-written summary
Seed vigor was judged unreliable for predicting sorghum germination performance under salt and drought stress.
Not reportedTaxon
Verbatim
e0“seed vigor is not a reliable indicator of germination performance under salt and drought stress conditions”
Claim · model-written summary
Genetic differences may contribute to sorghum stress tolerance.
Not reportedTaxon
Verbatim
e0“genetic differences may play an important role in stress tolerance”
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