Germination and Growth of Panicum virgatum Cultivars in a NaCl Gradient

Carson, M. A.; Bachle, Seton; Morris, Amy N.

doi:10.1007/978-3-319-27093-7_16

Cited by 3 publications

(4 citation statements)

References 32 publications

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“…Recent studies have found a strong salt-tolerance variation among switchgrass cultivars [26]. Nevertheless, these differences in the threshold of salinity for a significant reduction in germination could not onlybe dep3endent on genotype, but also on the experimental conditions [27]. As an example, seed germination of Panicum turgidum has been reported as significantly reduced by salinity levels above 50 mM and this effect was more pronounced at 20-30 ºC than at 15-25 ºC [28].…”

Section: Effects Of Stress Conditions On Germinationmentioning

confidence: 99%

Morpho-Physiological Responses of Alamo Switchgrass During Germination and Early Seedling Stage Under Salinity or Water Stress Conditions

et al. 2018

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Switchgrass (Panicum virgatum L.) is a warm perennial grass with valuable characteristics as a biofuel crop. To avoid competition with food crops, biofuel crops will be likely relegated to less productive soils such as marginal lands. Consequently, the salinity and water scarcity problems that commonly affect marginal lands, compromise biofuel crops germination, emergence and seedling establishment. The aims of this study were to study the germination and seedling growth of switchgrass under salinity and water stress, and to describe the morpho-anatomical responses of the roots and leaves in the seedlings to these stresses. The effect of salt and water stress was assessed using sodium chloride (NaCl) and polyethylene glycol 8000 (PEG) at the same water potentials of-0.8,-1.0 and-1.2 MPa. Seeds were moist prechilled for 7 days at 5 ºC and germinated at 30ºC/15 ºC (8 h light/16 h dark). NaCl treatments (-0.8 and-1.0 MPa) delayed germination rates but did not reduce the final germination percentage, whereas at a lower potential (-1.2 MPa) the final germination percentage was diminished. The effects of PEG (-1.0 and-1.2 MPa) on the germination rate and final percentage, were more detrimental than those induced by iso-osmotic concentrations of NaCl. PEG and NaCl reduced significantly the vigor index of-0.8 to-1.2 MPa. The morpho-anatomical changes such as the reduction in the root cross-section area and the thickening of the endodermis walls for both stress conditions and aerenchyma formation in the cortex under salinity, could significantly contribute in the survival and tolerance during the early seedling stages.

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Section: Effects Of Stress Conditions On Germinationmentioning

confidence: 99%

Morpho-Physiological Responses of Alamo Switchgrass During Germination and Early Seedling Stage Under Salinity or Water Stress Conditions

et al. 2018

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“…Panicum virgatum is moderately tolerant of saline conditions, and cultivar "PV-1777" had the highest salinity tolerance for upland ecotypes in one study [151], but in others, "Blackwell" [164,165] and "Trailblazer" [166] performed well in highsalinity conditions. Compared with Spartina pectinata, Panicum virgatum "Cave-in-Rock" had low germination (down 80 %) in high (300 mM) salinity levels, and less than 70 % of seedlings survived in even moderate salinity (100 mM) treatments [167].…”

Section: C4mentioning

confidence: 95%

“…In contrast, Pennisetum purpureum showed major reductions in shoot biomass in saline conditions [146], and M. × giganteus was only moderately salt tolerant [160]. Upland ecotypes of Panicum virgatum (e.g., "Blackwell," "Trailblazer," and "PV-1777") were among the more salt-tolerant cultivars [151,164,166,184], although the upland ecotype, "Cave-in-Rock," was not tolerant at the seedling stage [167].…”

Section: Salt-tolerant Biomass Cropsmentioning

confidence: 99%

Stress-Tolerant Feedstocks for Sustainable Bioenergy Production on Marginal Land

et al. 2015

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Given the mandated increases in fuel production from alternative sources, limited high-quality production land, and predicted climate changes, identification of stress-tolerant biomass crops will be increasingly important. However, existing literature largely focuses on the responses of a small number of crops to a single source of abiotic stress. Here, we provide a much-needed review of several types of stress likely to be encountered by biomass crops on marginal lands and under future climate scenarios: drought, flooding, salinity, cold, and heat. The stress responses of 17 leading biomass crops of all growth habits (e.g., perennial grasses, shortrotation woody crops, and large trees) are summarized, and we identify several that could be considered "all purpose" for multiple stress types. Importantly, we note that some of these crops are or could become invasive in some landscapes. Therefore, growers must take care to avoid dissemination of plants or propagules outside of cultivation.

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“…Salinity causes reduction in the seed germination [14][15][16], seedling emergence [17], seedling growth [15,17,18], and yield of switchgrass [19]. It also modifies plants' physiological and biochemical processes [20].…”

Section: Introductionmentioning

confidence: 99%

Salt Tolerance of Six Switchgrass Cultivars

et al. 2018

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') were evaluated for salt tolerance in two separate greenhouse experiments. In experiment (Expt.) 1, switchgrass seedlings were irrigated with a nutrient solution at an electrical conductivity (EC) of 1.2 dS•m −1 (control) or a saline solution (spiked with salts) at an EC of 5.0 dS•m −1 (EC 5) or 10.0 dS•m −1 (EC 10) for four weeks, once a week. Treatment EC 10 reduced the tiller number by 32% to 37% for all switchgrass cultivars except 'Kanlow'. All switchgrass cultivars under EC 10 had a significant reduction of 50% to 63% in dry weight. In Expt. 2, switchgrass was seeded in substrates moistened with either a nutrient solution of EC 1.2 dS•m −1 (control) or a saline solution of EC of 5.0, 10.0, or 20.0 dS•m −1 (EC 5, EC 10, or EC 20). Treatment EC 5 did not affect the seedling emergence, regardless of cultivar. Compared to the control, EC 10 reduced the seedling emergence of switchgrass 'Alamo', 'Cimarron', and 'NL 94C2-3' by 44%, 33%, and 82%, respectively. All switchgrass cultivars under EC 10 had a 46% to 88% reduction in the seedling emergence index except 'NSL 2009-2'. No switchgrass seedlings emerged under EC 20. In summary, high salinity negatively affected switchgrass seedling emergence and growth. Dendrogram and cluster of six switchgrass cultivars indicated that 'Alamo' was the most tolerant cultivar, while 'NSL 2009-2' was the least tolerant cultivar at both seedling emergence and growth stages. A growth-stage dependent response to salinity was observed for the remaining switchgrass cultivars. 'NSL 2009-1' and 'NL 94C2-3' were more tolerant to salinity than 'Cimarron' and 'Kanlow' at the seedling emergence stage; however, 'Kanlow' and 'Cimarron' were more tolerant to salinity than 'NSL 2009-1' and 'NL 94C2-3' at the seedling growth stage.

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Germination and Growth of Panicum virgatum Cultivars in a NaCl Gradient

Cited by 3 publications

References 32 publications

Morpho-Physiological Responses of Alamo Switchgrass During Germination and Early Seedling Stage Under Salinity or Water Stress Conditions

Morpho-Physiological Responses of Alamo Switchgrass During Germination and Early Seedling Stage Under Salinity or Water Stress Conditions

Stress-Tolerant Feedstocks for Sustainable Bioenergy Production on Marginal Land

Salt Tolerance of Six Switchgrass Cultivars

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