scholarly journals Performance of Two Seashore Paspalum (Paspalum vaginatum Sw.) Varieties Growing in Shallow Green Roof Substrate Depths and Irrigated with Seawater

Agronomy ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 250
Author(s):  
Nikolaos Ntoulas ◽  
Ioannis Varsamos
Keyword(s):  
Salt Stress ◽  
Saline Water ◽  
Recovery Period ◽  
Green Roof ◽  
Seashore Paspalum ◽  
Greenhouse Study ◽  
Irrigation Regimes ◽  
Mediterranean Countries ◽  
Paspalum Vaginatum ◽  
Seawater Irrigation

The continuing decline in global drinking water reserves necessitates finding alternative water sources for turfgrass irrigation, especially in southern semi-arid Mediterranean countries. The aim of the present study was to evaluate the potential of using seawater for irrigating two varieties of seashore paspalum (Paspalum vaginatum Sw.), “Marina” and “Platinum ΤΕ”, growing in shallow green roof substrates, and to determine their recuperative capacity after the termination of the salt stress period. The greenhouse study comprised of 48 lysimeters equipped with extensive green roof layering. Treatments included: (i) two substrate depths (7.5 cm or 15 cm) and (ii) three seawater irrigation regimes (7 mm, 15 mm, or 45 mm every two days). Measurements included the determination of green turf cover (GTC) as well as the leaching fraction (LF) and leachate electrical conductivity (ECL) draining from the lysimeters. It was found that during the 46-d salt stress period, none of the seawater irrigation regimes managed to maintain acceptable GTC levels for both seashore paspalum varieties. Increasing the green roof substrate depth from 7.5 cm to 15 cm resulted in GTC improvement. During the recovery period, the use of potable water as irrigation source improved GTC levels. After 40 d the recovery was complete since GTC exceeded 90% in all treatments for both varieties. Regression curves correlating GTC response to ECL can be used to estimate the leaching requirements of turfgrasses grown in shallow green roof systems when irrigated with saline water.

scholarly journals Comparative transcriptome profiling provides insights into plant salt tolerance in seashore paspalum (Paspalum vaginatum)

2020 ◽  
Author(s):  
Peipei Wu ◽  
Steven Cogill ◽  
Yijian Qiu ◽  
Zhigang Li ◽  
Man Zhou ◽  
...  
Keyword(s):  
Transcription Factors ◽  
Salt Stress ◽  
Salinity Tolerance ◽  
Molecular Mechanisms ◽  
Perennial Grass ◽  
Differential Expression Analysis ◽  
Reduction Process ◽  
Salt Treatment ◽  
Seashore Paspalum ◽  
Paspalum Vaginatum

Abstract Background: Seashore paspalum (Paspalum vaginatum), a halophytic warm-seasoned perennial grass, is tolerant of many environmental stresses, especially salt stress. To investigate molecular mechanisms underlying salinity tolerance in seashore paspalum, physiological characteristics and global transcription profiles of highly (Supreme) and moderately (Parish) salinity-tolerant cultivars under normal and salt stressed conditions were analyzed.Results: Physiological characterization comparing highly (Supreme) and moderately (Parish) salinity-tolerant cultivars revealed that Supreme’s higher salinity tolerance is associated with higher Na+ and Ca2+ accumulation under normal conditions and further increase of Na+ under salt-treated conditions (400 mM NaCl), possibly by vacuolar sequestration. Moreover, K+ retention under salt treatment occurs in both cultivars, suggesting that it may be a conserved mechanism for prevention of Na+ toxicity. We sequenced the transcriptome of the two cultivars under both normal and salt-treated conditions (400 mM NaCl) using RNA-seq. De novo assembly of about 153 million high-quality reads and identification of Open Reading Frames (ORFs) uncovered a total of 82,608 non-redundant unigenes, of which 3,250 genes were identified as transcription factors (TFs). Gene Ontology (GO) annotation revealed the presence of genes involved in diverse cellular processes in seashore paspalum’s transcriptome. Differential expression analysis identified a total of 828 and 2,222 genes that are responsive to high salinity for Supreme and Parish, respectively. “Oxidation-reduction process” and “nucleic acid binding” are significantly enriched GOs among differentially expressed genes in both cultivars under salt treatment. Interestingly, compared to Parish, a number of salt stress induced transcription factors are enriched and show higher abundance in Supreme under normal conditions, possibly due to enhanced Ca2+ signaling transduction out of Na+ accumulation, which may be another contributor to Supreme’s higher salinity tolerance.Conclusion: Physiological and genomics analyses of seashore paspalum reveal major molecular underpinnings contributing to plant response to salt stress in this halophytic warm-seasoned perennial grass. The data obtained provide valuable molecular resources for functional studies and developing strategies to engineer plant salinity tolerance.

scholarly journals Comparative transcriptome profiling provides insights into plant salt tolerance in seashore paspalum (Paspalum vaginatum)

2019 ◽  
Author(s):  
Peipei Wu ◽  
Steven Cogill ◽  
Yijian Qiu ◽  
Zhigang Li ◽  
Man Zhou ◽  
...  
Keyword(s):  
Transcription Factors ◽  
Salt Stress ◽  
Salinity Tolerance ◽  
Molecular Mechanisms ◽  
Perennial Grass ◽  
Differential Expression Analysis ◽  
Reduction Process ◽  
Salt Treatment ◽  
Seashore Paspalum ◽  
Paspalum Vaginatum

Abstract Background: Seashore paspalum (Paspalum vaginatum), a halophytic warm-seasoned perennial grass, is tolerant of many environmental stresses, especially salt stress. To investigate molecular mechanisms underlying salinity tolerance in seashore paspalum, physiological characteristics and global transcription profiles of highly (Supreme) and moderately (Parish) salinity-tolerant cultivars under normal and salt stressed conditions were analyzed. Results: Physiological characterization comparing highly (Supreme) and moderately (Parish) salinity-tolerant cultivars revealed that Supreme’s higher salinity tolerance is associated with higher Na+ and Ca2+ accumulation under normal conditions and further increase of Na+ under salt-treated conditions (400 mM NaCl), possibly by vacuolar sequestration. Moreover, K+ retention under salt treatment occurs in both cultivars, suggesting that it may be a conserved mechanism for prevention of Na+ toxicity. We sequenced the transcriptome of the two cultivars under both normal and salt-treated conditions (400 mM NaCl) using RNA-seq. De novo assembly of about 153 million high-quality reads and identification of Open Reading Frames (ORFs) uncovered a total of 82,608 non-redundant unigenes, of which 3,250 genes were identified as transcription factors (TFs). Gene Ontology (GO) annotation revealed the presence of genes involved in diverse cellular processes in seashore paspalum’s transcriptome. Differential expression analysis identified a total of 828 and 2,222 genes that are responsive to high salinity for Supreme and Parish, respectively. “Oxidation-reduction process” and “nucleic acid binding” are significantly enriched GOs among differentially expressed genes in both cultivars under salt treatment. Interestingly, compared to Parish, a number of salt stress induced transcription factors are enriched and show higher abundance in Supreme under normal conditions, possibly due to enhanced Ca2+ signaling transduction out of Na+ accumulation, which may be another contributor to Supreme’s higher salinity tolerance. Conclusion: Physiological and genomics analyses of seashore paspalum reveal major molecular underpinnings contributing to plant response to salt stress in this halophytic warm-seasoned perennial grass. The data obtained provide valuable molecular resources for functional studies and developing strategies to engineer plant salinity tolerance.

scholarly journals Comparative transcriptome profiling provides insights into plant salt tolerance in seashore paspalum (Paspalum vaginatum)

2019 ◽  
Author(s):  
Hong Luo ◽  
Peipei Wu ◽  
Steven Cogill ◽  
Yijian Qiu ◽  
Zhigang Li ◽  
...  
Keyword(s):  
Transcription Factors ◽  
Salt Stress ◽  
Salinity Tolerance ◽  
Molecular Mechanisms ◽  
De Novo ◽  
Perennial Grass ◽  
Differential Expression Analysis ◽  
Reduction Process ◽  
Seashore Paspalum ◽  
Paspalum Vaginatum

Abstract Background Seashore paspalum (Paspalum vaginatum), a halophytic warm-seasoned perennial grass, is tolerant of many environmental stresses, especially salt stress. To investigate molecular mechanisms underlying salinity tolerance in seashore paspalum, physiological characteristics and global transcription profiles of highly (Supreme) and moderately (Parish) salinity-tolerant cultivars under normal and salt stressed conditions were analyzed. Results Physiological characterization comparing highly (Supreme) and moderately (Parish) salinity-tolerant cultivars revealed that Supreme’s higher salinity tolerance is associated with higher Na+ and Ca2+ accumulation under normal conditions and further increase of Na+ under salt-treated conditions (400 mM NaCl), possibly by vacuolar sequestration. Moreover, K+ retention under salt treatment occurs in both cultivars, suggesting that it may be a conserved mechanism for prevention of Na+ toxicity. We sequenced the transcriptome of the two cultivars under both normal and salt-treated conditions (400 mM NaCl) using RNA-seq. De novo assembly of about 153 million high-quality reads and identification of Open Reading Frames (ORFs) uncovered a total of 82,608 non-redundant unigenes, of which 3,250 genes were identified as transcription factors (TFs). Gene Ontology (GO) annotation revealed the presence of genes involved in diverse cellular processes in seashore paspalum’s transcriptome. Differential expression analysis identified a total of 828 and 2,222 genes that are responsive to high salinity for Supreme and Parish, respectively. GO enrichment analysis demonstrated that genes involved in “oxidation-reduction process” and “nucleic acid binding” are significantly associated with salinity tolerance in both cultivars. Interestingly, compared to Parish, a number of salt stress induced transcription factors are enriched and show higher abundance in Supreme under normal conditions, possibly due to enhanced Ca2+ signaling transduction out of Na+ accumulation, which may be another contributor to Supreme’s higher salinity tolerance. Conclusion Physiological and genomics analyses of seashore paspalum reveal major molecular underpinnings contributing to plant response to salt stress in this halophytic warm-seasoned perennial grass. The data obtained provide valuable molecular resources for functional studies and developing strategies to engineer plant salinity tolerance.

Effect of irrigation regimes using saline water on faba bean ( Vicia faba L.) yield and water productivity in an arid environment*

2021 ◽  
Author(s):  
Fathia El Mokh ◽  
Kamel Nagaz ◽  
Ashok Kumar Alva ◽  
Mohamed Moncef Masmoudi ◽  
Netij Ben Mechlia
Keyword(s):  
Vicia Faba ◽  
Faba Bean ◽  
Saline Water ◽  
Water Productivity ◽  
Arid Environment ◽  
Irrigation Regimes ◽  
Vicia Faba L

scholarly journals Formation of ‘Crioula’ guava rootstock under saline water irrigation and nitrogen doses

2016 ◽  
Vol 20 (8) ◽  
pp. 739-745 ◽  
Author(s):  
Leandro de P. Souza ◽  
Reginaldo G. Nobre ◽  
Evandro M. da Silva ◽  
Geovani S. de Lima ◽  
Francisco W. A. Pinheiro ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Salt Stress ◽  
Experimental Design ◽  
Deleterious Effect ◽  
Saline Water ◽  
Dry Weight ◽  
Saline Water Irrigation ◽  
N Dose

ABSTRACT The objective of this research was to evaluate the growth and formation of fresh and dry weight of ‘Crioula’ guava rootstock irrigated with waters of different saline levels and nitrogen (N) doses, in an experiment conducted in plastic tubes under greenhouse conditions. The experimental design was randomized blocks, in a 5 x 4 factorial scheme with four replicates, and the treatments consisted of five levels of water electrical conductivity - ECw (0.3, 1.1, 1.9, 2.7 and 3.5 dS m-1) and four N doses (70, 100, 130 and 160% of the N dose recommended for the cultivation of guava seedlings, cv. ‘Paluma’). The dose referring to 100% corresponds to 773 mg of N dm-3. The highest growth of ‘Crioula’ guava rootstock was obtained with ECw of 0.3 dS m-1 and fertilization of 541.1 mg N dm-3 of soil; increasing N doses did not reduce the deleterious effect of the salt stress on the growth and phytomass formation of ‘Crioula’ guava rootstock; irrigation with water of up to 1.75 dS m-1, in the production of guava rootstocks, promotes acceptable reduction of 10% in growth and quality of the seedlings.

Biology and Biotype Determination of Greenbug, Schizaphis graminum (Hemiptera: Aphididae), on Seashore Paspalum Turfgrass (Paspalum vaginatum)

2008 ◽  
Vol 37 (2) ◽  
pp. 586-591 ◽  
Author(s):  
G. S. Nuessly ◽  
R. T. Nagata ◽  
J. D. Burd ◽  
M. G. Hentz ◽  
A. S. Carroll ◽  
...  
Keyword(s):  
Schizaphis Graminum ◽  
Seashore Paspalum ◽  
Paspalum Vaginatum

scholarly journals The influence of salt stress on the morpho physiological and biochemical parameters of durum wheat varieties (Triticum durum Desf.)

2020 ◽  
Vol 93 (1) ◽  
Author(s):  
Nadia Chiahi ◽  
Louhichi Brinis
Keyword(s):  
Salt Stress ◽  
Durum Wheat ◽  
Soluble Sugars ◽  
Germination Percentage ◽  
Limiting Factors ◽  
Human Consumption ◽  
Wheat Varieties ◽  
Mediterranean Countries ◽  
Agricultural Yield ◽  
Physiological And Biochemical

Wheat is an important cereal in terms of human consumption in many countries of the world. It is grown mainly in arid and semi-arid Mediterranean countries. In these areas, salinity of soils and irrigation water is one of the limiting factors in plant productivity and agricultural yield. The present work consisted in evaluating the morpho-physiological and biochemical behavior of two durum wheat varieties V1 (Gta dur), V2 (Vitron) subjected to increasing concentrations of NaCl during the germination phase and the growth phase in the laboratory. The results obtained showed several revelations in terms of morphological imbalance (leaf area, germination percentage, root length, physiological variation, decrease or increase of assimilating pigments, Relative Water Content (RWC), etc), and biochemical bioaccumulation (proline, soluble sugars, proteins and elevation of activity of CAT antioxidant enzymes). At the level of treatments, the development of the seedlings of two varieties was better on soil salty and sprinkled with water than in the presence of saline concentrations. A certain tolerance of the two genotypes was particularly marked in the Vitron variety against salt stress.

scholarly journals Flaming to control weeds in seashore paspalum (Paspalum vaginatum Sw.) turfgrass

2019 ◽  
Author(s):  
Luisa Martelloni ◽  
Marco Fontanelli ◽  
Lisa Caturegli ◽  
Monica Gaetani ◽  
Nicola Grossi ◽  
...  
Keyword(s):  
Weed Control ◽  
Urban Areas ◽  
Optimal Dose ◽  
Liquefied Petroleum Gas ◽  
Seashore Paspalum ◽  
The Third ◽  
Paspalum Vaginatum ◽  
Weed Cover ◽  
The University ◽  
Flame Weeding

Weed control is crucial to ensure that turfgrass is established effectively. Although herbicides are commonly used to control weeds in turfgrasses, environmental and public health concerns have led to limiting or banning the use of synthetic herbicides in urban areas. The species seashore paspalum (Paspalum vaginatumSw.) is susceptible to such herbicides. Flame weeding could be an alternative to the use of synthetic herbicides for selective weed control in seashore paspalum. In this study, five different liquefied petroleum gas (LPG) doses of flaming (0, 61, 91, 157 and 237 kg ha-1) were tested in order to find the optimal dose, in terms of weed control and costs. The aim was to maintain a seashore paspalum (cultivar ‘Salam’) turf free of weeds during spring green-up, and at the same time avoid damaging the turfgrass. Using a self-propelled machine designed and built at the University of Pisa, flaming was applied three times when weeds started growing and the turfgrass started green-up. Our results highlight that an LPG dose of 157 kg ha-1was the most economic dose that led to a significant reduction in initial weed cover and density, enabling the turfgrass to recover three weeks after the third application.

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