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Zeng, Linghe; Poss, James A.; Wilson, Clyde; Draz, A. E.; Gregorio, Glenn B.; Grieve, Catherine M.

doi:10.1023/a:1022248522536

Cited by 68 publications

(17 citation statements)

References 36 publications

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“…In most breeding programs, simple visual salt injury scoring [9] is widely used for characterization because it reflects the plant's overall response to salt stress. However, although quantitative characteristics of salinity tolerance, such as Na-K selectivity [73], Na-Ca selectivity [74], and proline concentration [75], render evaluation more difficult, these studies still prefer to use these quantitative characters as a standard for classification of genotypes for salt tolerance.…”

Section: Discussionmentioning

confidence: 99%

Detecting Salt Tolerance in Doubled Haploid Wheat Lines

et al. 2019

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Improving salt tolerance of genotypes requires a source of genetic variation and multiple accurate selection criteria for discriminating their salt tolerance. A combination of morpho-physiological and biochemical parameters and multivariate analysis was used to detect salt tolerance variation in 15 wheat lines developed by doubled haploid (DHL) technique. They were then compared with the salt-tolerant check cultivar Sakha 93. Salinity stress was investigated at three salinity levels (0, 100, and 200 mM NaCl) for 25 days. Considerable genetic variation was observed for all traits, as was high heritability (>60%) and genetic gain (>20%). Principal component analysis indicated the ability of nine traits (root number, root length, root dry weight, shoot length, shoot dry weight, specific root length, relative water content, membrane stability index, and catalase) to identify differences in salinity tolerance among lines. Three traits (shoot length, shoot dry weight, and catalase) were indicative of salt-tolerance, indicating their importance in improving and evaluating salt tolerant genotypes for breeding programs. The salinity tolerance membership index based on these three traits classified one new line (DHL21) and the check cultivar (Sakha 93) as highly salt-tolerant, DHL25, DHL26, DHL2, DHL11, and DHL5 as tolerant, and DHL23 and DHL12 as intermediate. Discriminant function analysis and MANOVA suggested differences among the five groups of tolerance. Among the donor genotypes, Sakha 93 remained the donor of choice for improving salinity tolerance during the seedling stage. The tolerated lines (DHL21, DHL25, DHL26, DHL2, DHL11, and DHL5) could be also recommended as useful and novel genetic resources for improving salinity tolerance of wheat in breeding programs.

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Section: Discussionmentioning

confidence: 99%

Detecting Salt Tolerance in Doubled Haploid Wheat Lines

et al. 2019

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“…Numerous physiological studies on the mechanisms of tolerance during the vegetative stage have been published [5,7-9], most of which showed an inverse relation between shoot Na + content and/or Na + /K + ratio and plant survival, injury scores and grain yield [10,11]. Other traits suggested to be associated with salt tolerance in various studies are compartmentation of Na + in older leaves and leaf sheaths and in the vacuoles, maintenance of mineral nutrient homeostasis, especially K + and Ca 2+ , high selectivity for K + and/or Ca 2+ uptake over that of Na + , limiting effects of reactive oxygen species (ROS scavenging), accumulation of compatible solutes to offset osmotic effects (osmotic adjustment), maintenance of leaf area index and maintenance of tiller number [5,9-13].…”

Section: Introductionmentioning

confidence: 99%

“…A number of authors published studies involving small numbers of accessions [10,36-41]. Only four studies appear to have examined more than a few dozen accessions [9,42-44], and even these have focused on breeding lines and improved cultivars, which tend to stem from a small donor pool typically involving Pokkali and/or Nona Bokra as donors.…”

Section: Introductionmentioning

confidence: 99%

Salinity tolerance, Na+ exclusion and allele mining of HKT1;5 in Oryza sativa and O. glaberrima: many sources, many genes, one mechanism?

2013

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BackgroundCultivated rice species (Oryza sativa L. and O. glaberrima Steud.) are generally considered among the crop species most sensitive to salt stress. A handful of lines are known to be tolerant, and a small number of these have been used extensively as donors in breeding programs. However, these donors use many of the same genes and physiological mechanisms to confer tolerance. Little information is available on the diversity of mechanisms used by these species to cope with salt stress, and there is a strong need to identify varieties displaying additional physiological and/or genetic mechanisms to confer higher tolerance.ResultsHere we present data on 103 accessions from O. sativa and 12 accessions from O. glaberrima, many of which are identified as salt tolerant for the first time, showing moderate to high tolerance of high salinity. The correlation of salinity-induced senescence (as judged by the Standard Evaluation System for Rice, or SES, score) with whole-plant and leaf blade Na+ concentrations was high across nearly all accessions, and was almost identical in both O. sativa and O. glaberrima. The association of leaf Na+ concentrations with cultivar-groups was very weak, but association with the OsHKT1;5 allele was generally strong. Seven major and three minor alleles of OsHKT1;5 were identified, and their comparisons with the leaf Na+ concentration showed that the Aromatic allele conferred the highest exclusion and the Japonica allele the least. A number of exceptions to this association with the Oryza HKT1;5 allele were identified; these probably indicate the existence of additional highly effective exclusion mechanisms. In addition, two landraces were identified, one from Thailand and the other from Senegal, that show high tissue tolerance.ConclusionsSignificant variation in salinity tolerance exists within both cultivated Oryza species, and this is the first report of significant tolerance in O. glaberrima. The majority of accessions display a strong quantitative relationship between tolerance and leaf blade Na+ concentration, and thus the major tolerance mechanisms found in these species are those contributing to limiting sodium uptake and accumulation in active leaves. However, there appears to be genetic variation for several mechanisms that affect leaf Na+ concentration, and rare cases of accessions displaying different mechanisms also occur. These mechanisms show great promise for improving salt tolerance in rice over that available from current donors.

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“…But this reduction was varied among the germplasms due to their genetic factors. Salt tolerant cultivars are capable of maintaining higher K + /Na + ratios in tissues (Mansour, 2003;Zeng et al, 2003). Plant growth under 12 dS/m saline conditions accumulated more of Na + , decreased Ca 2+ uptake, reducing Ca 2+ /Na + ratios in root, shoot and leaf.…”

Section: Discussionmentioning

confidence: 99%

Screening of brinjal lines to high salinity levels

Uddin¹,

Mutahera²,

Mehraj³

et al. 2016

J. biosci. agric. res.

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A pot experiment was conducted at the Sher-e-Bangla Agricultural University, Bangladesh during the months of November 2012 to April 2013 for screening the salt tolerant brinjal lines. Ten lines coded from V1 (Line-1) to V10 (Line-10) were executed under different salinity conditions (S0: Control; S1: 12dS/m and S2: 16 dS/m) following completely randomized design (CRD) with three replication. Maximum yield was provided by V1 and V6 (2.4 kg/plant) in 12 dS/m salinity level and V6 provided the maximum yield (1.3 kg/plant) which was closely followed by V1 (1.2 kg/plant) in 16 dS/m salinity level whereas 4.1 kg/plant and 3.8 kg/plant from V6 and V1 respectively in control. From the current study it can be stated that V6 and V1 lines were the best lines to grow in the highly saline affected areas in Bangladesh but varietal development form promising line and further field trials in different areas is recommended.

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Cited by 68 publications

References 36 publications

Detecting Salt Tolerance in Doubled Haploid Wheat Lines

Detecting Salt Tolerance in Doubled Haploid Wheat Lines

Salinity tolerance, Na+ exclusion and allele mining of HKT1;5 in Oryza sativa and O. glaberrima: many sources, many genes, one mechanism?

Screening of brinjal lines to high salinity levels

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