Genomic regions associated with salinity tolerance in lowland switchgrass

Nayak, Santosh; Bhandari, Hem S.; Pantalone, Vincent R.; Saha, Malay C.; Ali, Shahjahan; Sams, Carl E.

doi:10.1002/csc2.20611

Cited by 3 publications

(5 citation statements)

References 59 publications

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“…A high-density genetic linkage map was constructed using 2684 SNP markers. Details of the genetic linkage maps have been published previously [28]. Briefly, a total of 18 linkage groups were determined.…”

Section: Genetic Linkage Mapmentioning

confidence: 99%

“…The NAM population was developed by crossing 15 diverse lowland switchgrass genotypes to a common parent, "AP13". Details of the genetic backgrounds of these switchgrass genotypes and a schematic diagram of the NAM population development process can be accessed in our previously published article [28]. In brief, 15 diverse genotypes were used as the pollen parents, and AP13 was used as a recurrent parent.…”

Section: Plant Materialsmentioning

confidence: 99%

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Identification of QTL Associated with Regrowth Vigor Using the Nested Association Mapping Population in Switchgrass

Nayak

Bhandari

Saha

et al. 2022

Plants

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Switchgrass (Panicum virgatum L.) is a warm-season perennial grass species that is utilized as forage for livestock and biofuel feedstock. The stability of biomass yield and regrowth vigor under changing harvest frequency would help manage potential fluctuations in the feedstock market and would provide a continuous supply of quality forage for livestock. This study was conducted to (i) assess the genetic variation and (ii) identify the quantitative trait loci (QTL) associated with regrowth vigor after multiple cuttings in lowland switchgrass. A nested association mapping (NAM) population comprising 2000 pseudo F2 progenies was genotyped with single nucleotide polymorphism (SNP) markers derived from exome-capture sequencing and was evaluated for regrowth vigor in 2017 and 2018. The results showed significant variation among the NAM families in terms of regrowth vigor (p < 0.05). A total of 10 QTL were detected on 6 chromosomes: 1B, 5A, 5B, 6B, 7B, and 8A, explaining the phenotypic variation by up to 4.7%. The additive genetic effects of an individual QTL ranged from −0.13 to 0.26. No single QTL showed a markedly large effect, suggesting complex genetics underlying regrowth vigor in switchgrass. The homologs of candidate genes that play a variety of roles in developmental processes, including plant hormonal signal transduction, nucleotide biosynthesis, secondary metabolism, senescence, and responses to both biotic and abiotic stresses, were identified in the vicinity of QTL.

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Section: Genetic Linkage Mapmentioning

confidence: 99%

Section: Plant Materialsmentioning

confidence: 99%

Identification of QTL Associated with Regrowth Vigor Using the Nested Association Mapping Population in Switchgrass

Nayak

Bhandari

Saha

et al. 2022

Plants

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“…The 18 parent genotypes were sublines derived from the cultivars, i.e., Alamo (10 sublines) and Kanlow (8 sublines) [26]. The salt-tolerant (EG1104-02) and sensitivity (PI 315723-1) checks used in this study were identified through a greenhouse screening of several genotypes for salt tolerance by Nayak et al [24]. Plants were screened under four different salt treatments in a greenhouse located at the University of Tennessee, Knoxville, TN (35.94 • N and 83.94 • W), for six weeks in June-July 2020 (Table 1).…”

Section: Plant Materials Growth Conditions and Experimental Treatmentsmentioning

confidence: 99%

“…Lowland switchgrass, including Alamo and Kanlow, exhibited significant differences, in terms of growth parameters, photosynthetic traits, and stomatal conductance, when exposed to salt [6,18,23]. Nayak et al [24] identified that two accessions of lowland switchgrass, EG 1104-1 and EG 1104-2, have a high level of salinity tolerance, based on visual observation, for salt injury. However, their study [24] did not explore the underlying biological mechanism for salt tolerance.…”

Section: Introductionmentioning

confidence: 99%

“…Nayak et al [24] identified that two accessions of lowland switchgrass, EG 1104-1 and EG 1104-2, have a high level of salinity tolerance, based on visual observation, for salt injury. However, their study [24] did not explore the underlying biological mechanism for salt tolerance. Therefore, the study's objectives reported herein are to: (i) determine salt tolerance differences among sublines derived from the cultivars Alamo and Kanlow against EG 1104-2 as a salt-tolerant check, and (ii) determine the mechanisms of salt tolerance in terms of growth, stomatal morphology, photosynthetic pigments content, and mineral composition traits.…”

Section: Introductionmentioning

confidence: 99%

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Genotypic Variation for Salt Tolerance within and between ‘Alamo’ and ‘Kanlow’ Switchgrass (Panicum virgatum L.) Cultivars

Shrestha

Sams

2022

Agronomy

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Switchgrass tolerates nutrient and water limitations; however, high salt concentrations may inhibit its production. Therefore, the salt tolerance potential of switchgrass needs to be enhanced for economic production. The objective of this study was to determine the differences within and between two lowland cultivars of switchgrass for growth, stomatal morphology, photosynthetic pigments content, and mineral traits. A greenhouse study was conducted on 18 sublines, derived from the cultivars Alamo (A) and Kanlow (K), plus a salt-tolerant and sensitivity check (20 genotypes). A split-plot randomized complete block design was used with three replications per treatment (0, 5, 10, and 20 dS m−1 NaCl). High salt concentrations (10 and 20 dS m−1 NaCl) reduced shoot biomass, stem diameter, and plant height up to 21, 11, and 16%, respectively, compared to the control for all genotypes (p < 0.05). Chlorophyll a and adaxial stomata width were moderately correlated with growth traits under saline conditions (r = 0.49 to 0.56, p < 0.05). The sublines 12A-227, TN13006-04, 12A-259, 12K-247, and TN13009-08 had better growth and accumulated less salt in shoot biomass than both checks. These results indicate that differences exist within and between the Alamo and Kanlow sublines, and it is possible to breed improved cultivars with increased salt tolerance.

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Genetic Analysis of Salinity Tolerance and Relevant Traits in Field Crops

Awaad

2023

Earth and Environmental Sciences Library

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Genomic regions associated with salinity tolerance in lowland switchgrass

Cited by 3 publications

References 59 publications

Identification of QTL Associated with Regrowth Vigor Using the Nested Association Mapping Population in Switchgrass

Identification of QTL Associated with Regrowth Vigor Using the Nested Association Mapping Population in Switchgrass

Genotypic Variation for Salt Tolerance within and between ‘Alamo’ and ‘Kanlow’ Switchgrass (Panicum virgatum L.) Cultivars

Genetic Analysis of Salinity Tolerance and Relevant Traits in Field Crops

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