Abstract
Abstract Eight diverse Brassica napus genotypes and their 28 F1s were evaluated in nonsaline and saline environments in sand culture. Combined analysis based on two salinity levels revealed significant salinity-level effects for shoot dry weight, plant height, root length, and ions in shoot tissues, including potassium (K), sodium (Na), Ca/Na, and K/Na. Salinity had no significant effect on shoot calcium (Ca) concentration. Stress intensity (SI) estimates, its larger values indicating the more severe stress intensities, were high for all studied traits except for root length, Ca, and Na. The mean of Na in a saline environment was more than seven times the mean in a nonsaline environment, therefore SI was not calculated for this parameter. Low estimates of SI for root length and Ca indicated the effects of a saline environment for these two traits were less than for the other traits. Significant interactions of genotype and salinity levels were observed for all studied traits. The results of factor analysis based on minimum eigenvalue revealed two factors for eight studied traits in a saline environment. Factor one was detected as a nutritional trait in which Ca, K, Ca/Na, and K/Na had a high coefficients factor loading. Factor two was detected as morphological traits. The results of factor analysis indicated that selection for nutritional traits should be more efficient than selection for morphological traits and, specifically, that selection based on K and K/Na should be more efficient than Ca and Ca/Na. Significant positive correlations were found between shoot dry weight and other traits, including Ca, K, Ca/Na, and K/Na in a saline environment; therefore, these ion relations can be used as good selection criteria for improving shoot dry weight. On the basis of low estimates of the tolerance index (TOL) for shoot dry weight (its large value represents more sensitivity to stress), it was concluded that the genotypes including BL2, Ceres, Shiralee, Falcon × BL2, PF7045/91 × Ceres, and BL2 × Ceres had suitable salinity tolerance in early stages of growth.
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Claims 9
Claim · model-written summary
Salinity significantly affected shoot dry weight, height, root length and shoot ion traits.
- Taxon
- Rapeseedt0
- Treatment
- salinity-levele0
- Outcome
- shoot dry weight, plant height, root length, and ions in shoot tissuese0
Not reportedComparatorDirection
Verbatim
e0“significant salinity-level effects for shoot dry weight, plant height, root length, and ions in shoot tissues, including potassium (K), sodium (Na), Ca/Na, and K/Na”
t0“Rapeseed”
Claim · model-written summary
Salinity had no significant effect on shoot calcium concentration.
- Taxon
- Rapeseedt0
- Treatment
- Salinitye0
- Outcome
- shoot calcium (Ca) concentratione0
- Direction
- no significant effecte0
Not reportedComparator
Verbatim
e0“Salinity had no significant effect on shoot calcium (Ca) concentration”
t0“Rapeseed”
Claim · model-written summary
Shoot sodium under salinity exceeded the nonsaline mean by more than sevenfold.
- Taxon
- Rapeseedt0
- Treatment
- saline environmente0
- Outcome
- mean of Nae0
- Value
- more than seven timese0
- Comparator
- nonsaline environmente0
Not reportedDirection
Verbatim
e0“The mean of Na in a saline environment was more than seven times the mean in a nonsaline environment”
t0“Rapeseed”
Claim · model-written summary
Root length and Ca were less affected by saline conditions than other traits.
Verbatim
e0“effects of a saline environment for these two traits were less than for the other traits”
e1“Low estimates of SI for root length and Ca”
t0“Rapeseed”
Claim · model-written summary
Genotype and salinity interacted significantly for all studied traits.
Not reportedDirection
Verbatim
e0“Significant interactions of genotype and salinity levels were observed for all studied traits”
t0“Rapeseed”
Claim · model-written summary
Factor analysis found nutritional and morphological factors among eight traits under salinity.
Not reportedDirection
Verbatim
e0“Factor one was detected as a nutritional trait in which Ca, K, Ca/Na, and K/Na had a high coefficients factor loading. Factor two was detected as morphological traits”
t0“Rapeseed”
Claim · model-written summary
Shoot dry weight correlated positively with Ca, K, Ca/Na and K/Na under salinity.
Verbatim
e0“Significant positive correlations were found between shoot dry weight and other traits, including Ca, K, Ca/Na, and K/Na in a saline environment”
t0“Rapeseed”
Claim · model-written summary
The authors favor nutritional traits, especially K and K/Na, for selection.
Verbatim
e0“selection based on K and K/Na should be more efficient than Ca and Ca/Na”
t0“Rapeseed”
Claim · model-written summary
Six named genotypes were judged suitably tolerant at early growth stages.
Verbatim
e0“BL2, Ceres, Shiralee, Falcon × BL2, PF7045/91 × Ceres, and BL2 × Ceres had suitable salinity tolerance in early stages of growth”
t0“Rapeseed”
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