scholarly journals Phosphorus-Induced Adaptation Mechanisms of Rye Grown on Post-Flotation Copper Tailings

Biology ◽  
2021 ◽  
Vol 10 (8) ◽  
pp. 818
Author(s):  
Piotr Stępień ◽  
Krzysztof Gediga ◽  
Zofia Spiak
Keyword(s):  
Cost Effective ◽  
Dry Mass ◽  
P Uptake ◽  
Considerable Effort ◽  
Growth And Survival ◽  
Copper Tailings ◽  
Ore Processing ◽  
Secale Cereale L ◽  
Organic Acid Exudation ◽  
Main Factor

Although a considerable effort has been made over the last decades to develop cost-effective phytotechnologies as an alternative to conventional techniques for the management of contaminated lands, successful revegetation of the tailings still represents a major challenge. Here, we evaluate the potential of rye (Secale cereale L.) for growth and survival on the tailings after copper (Cu) ore processing. Four rye varieties were cultivated in a pot experiment on the post-flotation sediment with increasing phosphorus (P) doses (22, 44, 66, 88, and 110 mg·kg−1). The resistance of the studied rye genotypes to stress was assessed by observing the growth and development of plants, determining the dry mass accumulation, the Cu and P uptake and content, and a number of physiological parameters related mainly to P mobilisation. Exposure of tested rye varieties to high Cu concentrations in the tailings did not result in any significant plant mortality, with the intracellular Cu concentrations being below the critical toxic level. In contrast, the low availability of P due to alkaline properties of the tailings and the mechanisms involved in the mobilisation of sparingly soluble forms of this element (i.e., H+-ATPase-driven proton efflux in roots and organic acid exudation), were identified as main factor determining the level of tolerance. The efficiency of the photosynthetic activity was a key determinant for the P-mobilising capacity of rye. We further showed that rye varieties with more primitive genetic background might be potentially more suitable for growth on the post-flotation copper tailings. The results provide important and novel knowledge that will certainly support future works in developing strategies for successful revitalisation of degraded lands.

scholarly journals Physiological Basis of Combined Stress Tolerance to Low Phosphorus and Drought in a Diverse Set of Mungbean Germplasm

Agronomy ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 99
Author(s):  
Surendra Kumar Meena ◽  
Renu Pandey ◽  
Sandeep Sharma ◽  
Gayacharan ◽  
Tarun Kumar ◽  
...  
Keyword(s):  
Principal Component ◽  
Stability Index ◽  
P Uptake ◽  
Combined Stress ◽  
Physiological Basis ◽  
Low Phosphorus ◽  
Relative Water ◽  
Use Efficiency ◽  
Organic Acid Exudation ◽  
Physiological Markers

To understand the physiological basis of tolerance to combined stresses to low phosphorus (P) and drought in mungbean (Vignaradiata (L.) R. Wilczek), a diverse set of 100 accessions were evaluated in hydroponics at sufficient (250 μM) and low (3 μM) P and exposed to drought (dehydration) stress. The principal component analysis and ranking of accessions based on relative values revealed that IC280489, EC397142, IC76415, IC333090, IC507340, and IC121316 performed superior while IC119005, IC73401, IC488526, and IC325853 performed poorly in all treatments. Selected accessions were evaluated in soil under control (sufficient P, irrigated), low P (without P, irrigated), drought (sufficient P, withholding irrigation), and combined stress (low P, withholding irrigation). Under combined stress, a significant reduction in gas exchange traits (photosynthesis, stomatal conductance, transpiration, instantaneous water use efficiency) and P uptake in seed and shoot was observed under combined stress as compared to individual stresses. Among accessions, IC488526 was most sensitive while IC333090 and IC507340 exhibited tolerance to individual or combined stress. The water balance and low P adaptation traits like membrane stability index, relative water content, specific leaf weight, organic acid exudation, biomass, grain yield, and P uptake can be used as physiological markers to evaluate for agronomic performance. Accessions with considerable tolerance to low P and drought stress can be either used as ‘donors’ in Vigna breeding program or cultivated in areas with limited P and water availability or both.

scholarly journals Aluminum and Phosphorus Interactions in Mycorrhizal and Nonmycorrhizal Highbush Blueberry Plantlets

1997 ◽  
Vol 122 (1) ◽  
pp. 24-30 ◽  
Author(s):  
Wei Qiang Yang ◽  
Barbara L. Goulart
Keyword(s):  
Plant Root ◽  
N Uptake ◽  
Dry Mass ◽  
Vaccinium Corymbosum ◽  
P Uptake ◽  
Highbush Blueberry ◽  
Mycorrhizal Infection ◽  
Negative Effects ◽  
Matter Production ◽  
Al Uptake

Aluminum (Al) and phosphorus (P) interactions were investigated in mycorrhizal (M) and nonmycorrhizal (NM) highbush blueberry (Vaccinium corymbosum L.) plantlets in a factorial experiment. The toxic effects of Al on highbush blueberry were characterized by decreased shoot, root, and total plant dry mass. Many of the negative effects of Al on plant root, shoot, and total dry matter production were reversed by foliar P and N application, indicating P or N uptake were limited by high Al concentration. However, Al-mediated growth reduction in P-stressed plants indicated that the restriction of P uptake by high Al may not have been the only mechanism for Al toxicity in this experiment. Root Al and P concentration were negatively correlated in NM but not M plantlets, suggesting mycorrhizal infection may alter P uptake processes. Al uptake was also affected by mycorrhizal infection, with more Al accumulating in M plantlet roots and leaves. Correlations among foliar ion concentrations were also affected by mycorrhizal fungal infection.

Influence of arbuscular mycorrhizae on soil P dynamics, corn P-nutrition and growth in a ridge-tilled commercial field

2008 ◽  
Vol 88 (3) ◽  
pp. 283-294 ◽  
Author(s):  
Christine P Landry ◽  
Chantal Hamel ◽  
Anne Vanasse
Keyword(s):  
Arbuscular Mycorrhizae ◽  
Arbuscular Mycorrhizal ◽  
Am Fungi ◽  
Dry Mass ◽  
Soil Disturbance ◽  
P Uptake ◽  
P Nutrition ◽  
Soil P ◽  
High Yields ◽  
Ridge Tillage

Ridge-tilled corn (Zea mays L.) could benefit from arbuscular mycorrhizal (AM) fungi. Under low soil disturbance, AM hyphal networks are preserved and can contribute to corn nutrition. A 2-yr study was conducted in the St. Lawrence Lowlands (Quebec, Canada) to test the effects of indigenous AM fungi on corn P nutrition, growth, and soil P in field cropped for 8 yr under ridge-tillage. Phosphorus treatments (0, 17, 35 kg P ha-1) were applied to AM-inhibited (AMI) (fungicide treated) and AM non-inhibited (AMNI) plots. Plant tissue and soil were sampled 22, 48 and 72 days after seeding (DAS). P dynamics was monitored in situ with anionic exchange membranes (PAEM) from seeding to the end of July. AMNI plants showed extensive AM colonization at all P rates. At 22 DAS, AMI plants had decreased growth in the absence of P inputs, while AMNI plants had higher dry mass (DM) and P uptake in unfertilized plots. The PAEM was lower in the AMNI unfertilized soils in 1998 and at all P rates in 1999, indicating an inverse relationship between P uptake and PAEM. At harvest, grain P content of AMNI plants was greater than that of AMI plants. In 1998, only AMI plants had decreased yield in the absence of P fertilization. In 1999, AMNI plants produced greater grain yield than AMI plants at all P rates. AM fungi improve the exploitation of soil P by corn thereby maintaining high yields while reducing crop reliance on P inputs in RT. Key words: Arbuscular mycorrhizae, ridge-tillage, soil P dynamics, corn, P nutrition

MANAGEMENT OF IDIOPATHIC CONGENITAL CLUBFOOT USING PONSETI METHOD

2021 ◽  
pp. 38-39
Author(s):  
Chunchesh MD Chunchesh MD ◽  
Vani Ahuja ◽  
Kiran S Mahapure
Keyword(s):  
Cost Effective ◽  
Ponseti Method ◽  
Foot Deformities ◽  
Idiopathic Clubfoot ◽  
Congenital Talipes Equinovarus ◽  
Cost Effective Treatment ◽  
Pediatric Orthopaedics ◽  
Talipes Equinovarus ◽  
Main Factor

Introduction: Idiopathic congenital talipes equinovarus is a complex deformity that is difcult to correct. The treatment of clubfoot is controversial and continues to be one of the biggest challenges in pediatric orthopaedics. Most orthopedists agree that the initial treatment should be non-surgical and should be started soon after birth. We aimed to study a short-term follow up of 30 patients treated by the Ponseti method at our institute to assess the efcacy of the treatment modality. Methodology: 30 patients underwent Ponseti method for a period of 2 years, patients were followed up regularly at weekly intervals. The severity of foot deformities was graded as per Pirani's scoring system. Results: The Ponseti method is a safe and cost-effective treatment for congenital idiopathic clubfoot and radically decreases the need for extensive corrective surgery. Non-compliance with orthotics has been widely reported to be the main factor causing failure of the technique. At the end of study good results were obtained in 28 patients. 2 patients developed recurrence of the deformity due to non-compliance of the use of Orthotics.

Investigating the Impact of Using Knowledge Management on Organisational Agility through Competitive Intelligence and Strategic Thinking

2019 ◽  
Vol 18 (02) ◽  
pp. 1950016
Author(s):  
Hossein Sayyadi Tooranloo ◽  
Sepideh Saghafi
Keyword(s):  
Knowledge Management ◽  
Structural Equation ◽  
Strategic Thinking ◽  
Competitive Intelligence ◽  
Necessary Condition ◽  
Growth And Survival ◽  
The Impact ◽  
Organisational Agility ◽  
Main Factor

Agility is a necessary condition, which is known as the main factor for the success of corporations to compete. In this sense, organisations have to determine their strategic priorities and accordingly develop and implement appropriate strategies in order to preserve their growth and survival. Meanwhile, managers play an important role in the process of strategic planning and making decisions related to their way of thinking. In addition, the existence of competitive intelligence plan for organisations has a striking role to optimally use the existing opportunities and using knowledge management (KM) in the organisation provides a platform to do so. This work aims to study the impact of using knowledge management on organisational agility as a case study in the ceramic and tile industry of the provinces of Yazd and Kerman. The data was collected using questionnaires. The structural equation modelling was used to analyse the research hypotheses using LISREL software. The results of the study showed that knowledge management application has a positive and significant effect on agility through using competitive intelligence and strategic thinking.

Effect of a carnivorous diet on the lipids, fatty acids and condition of Antarctic krill, Euphausia superba

2007 ◽  
Vol 19 (2) ◽  
pp. 183-188 ◽  
Author(s):  
Wilhelm Hagen ◽  
Toshihiro Yoshida ◽  
Patti Virtue ◽  
So Kawaguchi ◽  
Kerrie M. Swadling ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Polar Lipid ◽  
Antarctic Krill ◽  
Euphausia Superba ◽  
Dry Mass ◽  
Fatty Acid Profiles ◽  
Omega 3 ◽  
Feeding Trial ◽  
Growth And Survival ◽  
In The Wild

AbstractKrill are thought to be predominantly herbivorous, but a heterotrophic diet might be crucial for their growth and survival. To compare the influence of herbivory and carnivory on krill we conducted a nine month feeding trial. We examined lipid composition of the hepatopancreas, abdomen and remaining body portions of krill fed diatoms at bloom condition levels, and diatoms with the addition of pellets or minced clam meat to simulate a partly carnivorous diet. Mortality, dry mass and lipid content were similar among treatments. We examined lipid class and fatty acid profiles, with emphasis placed on the ratio of storage (triacylglycerol) to structural (polar lipid) lipid and key essential omega 3 polyunsaturated fatty acids: 20:5ω3 and 22:6ω3. The triacylglycerol : polar lipid ratio increased in krill fed on the mixed diet as did the 20:5ω3 : 22:6ω3 ratio. Overall these findings indicate that provision of clam in the diet improved krill condition, and further suggest that carnivory may aid krill growth in the wild under certain environmental conditions.

scholarly journals Nematicide Trials on Paprika Pepper

HortScience ◽  
1997 ◽  
Vol 32 (3) ◽  
pp. 435A-435
Author(s):  
Brian A. Kahn ◽  
John P. Damicone ◽  
Kenneth E. Jackson ◽  
James E. Motes ◽  
Mark E. Payton
Keyword(s):  
Capsicum Annuum ◽  
Arachis Hypogaea ◽  
Field Experiments ◽  
Potential Problem ◽  
Cost Effective ◽  
Dry Mass ◽  
Fruit Yield ◽  
Plant Dry Mass

Nematodes (Meloidogyne sp.) are a potential problem when paprika peppers (Capsicum annuum L.) are grown in fields historically planted to peanuts (Arachis hypogaea L.). Nine nematicide treatments were evaluated over 3 years in field experiments on paprika pepper. Materials tested included the chitin nematicide ClandoSan and six chemicals: fosthiazate, carbofuran, aldicarb, oxamyl, fenamiphos, and dichloropropene. Stands at harvest were increased relative to the control by ClandoSan in 2 of 3 years. Other horticultural effects (plant dry mass and fruit yield) were minimal for all nine nematicide treatments. No one nematicide treatment consistently reduced nematode counts at harvest relative to the control. Nematode counts at harvest were greater in plots treated with ClandoSan than in plots treated with any other material in 2 of 3 years. Nematicide treatments were not cost effective under the conditions of these studies.

scholarly journals Mycorrhiza Reduces Phosphorus Uptake from Struvite in Rye (Secale cereale L.) Plants

2021 ◽  
Author(s):  
Sanja Annabell Schwalb ◽  
Michael Hemkemeyer ◽  
Conor Watson ◽  
Florian Wichern
Keyword(s):  
Secale Cereale ◽  
Arbuscular Mycorrhizae ◽  
Phosphorus Uptake ◽  
Inorganic Phosphorus ◽  
P Uptake ◽  
Control Treatment ◽  
Shoot Biomass ◽  
Extractable P ◽  
Secale Cereale L ◽  
Middle Compartment

AbstractTo reduce dependency on inorganic phosphorus (P) fertiliser, secondary P fertilisers such as struvite are becoming more important. However, the P uptake of these new fertilisers by plants is often not known and may be enhanced by plant associated microorganisms. We therefore investigated the effect of arbuscular mycorrhizae (AM) on P uptake in rye (Secale cereale L.), grown in the middle compartment of a box with chambers separated by a 30 µm mesh allowing fungal hyphae but not roots to penetrate. Plants with (AM) or without (control) mycorrhizae (Rhizophagus irregularis) were grown in a P limited sand medium for 72 days. After harvest, plants were analysed for mycorrhizal colonization, shoot and root development and nutrient (P, Ca, Mg) uptake. Further, pH was measured in each compartment. Shoot biomass of both treatments was not different, but root biomass was significantly lower in AM plants. Despite plants of the AM treatment being colonised by mycorrhizae, their P uptake was substantially lower compared to the control treatment, but root nutrient concentration was higher. Even though the pH in the mycorrhizal compartment of the AM treatment was significantly lower compared to the control, water- and CAL-extractable P were similar, indicating little P uptake from this compartment. Extractable P was reduced only in the root compartment of the control, which was associated with a lower pH compared to the AM treatment. In conclusion, mycorrhizae did not increase P uptake from struvite in rye plants. Non-mycorrhizal plants which invested more biomass into roots took up more P. Graphical abstract

scholarly journals Physiological Basis of Combined Stress Tolerance to Low Phosphorus and Drought in Mungbean Core Set Dderived from Diverse Germplasm

2020 ◽  
Author(s):  
Surendra Kumar Meena ◽  
Renu Pandey ◽  
Sandeep Sharma ◽  
Gayacharan Gayacharan ◽  
Tarun Kumar ◽  
...  
Keyword(s):  
Principal Component ◽  
Stability Index ◽  
P Uptake ◽  
Combined Stress ◽  
Physiological Basis ◽  
Core Set ◽  
Low Phosphorus ◽  
Relative Water ◽  
Organic Acid Exudation ◽  
Physiological Markers

To understand the physiological basis of tolerance to combined stresses to low phosphorus (P) and drought in mungbean (Vigna radiata (L.) R. Wilczek), a core set of 100 accessions were evaluated in hydroponics at sufficient (250 μM) and low (3 μM) P, and exposed to drought (dehydration) stress. The principal component analysis and ranking of accessions based on relative values revealed that IC280489, EC397142, IC76415, IC333090, IC507340 and IC121316 performed superior while IC119005, IC73401, IC488526 and IC325853 performed poorly in all treatments. Selected accessions were evaluated in soil under control (sufficient P, irrigated), low P (without P, irrigated), drought (sufficient P, withholding irrigation) and combined stress (low P, withholding irrigation). Under combined stress, a significant reduction in gas exchange traits (photosynthesis, stomatal conductance, transpiration, instantaneous water use efficiency), P uptake in seed and shoot was observed under combined stress as compared to individual stresses. Among accessions, IC488526 was most sensitive while IC333090 and IC507340 exhibited tolerance to individual or combined stress. The water balance and low P adaptation traits like membrane stability index, relative water content, specific leaf weight, organic acid exudation, biomass, grain yield and P uptake can be used as physiological markers to evaluate for agronomic performance. Accessions with considerable resilience to low P and drought stress can be either used as ‘donors’ in Vigna breeding program or cultivated in areas with limited P and water availability or both.

scholarly journals Ecological Engineering for the Optimisation of the Land-Based Marine Aquaculture of Coastal Shellfish

2020 ◽  
Vol 17 (19) ◽  
pp. 7224
Author(s):  
Catharina J. M. Philippart ◽  
Kiki E. M. Dethmers ◽  
Johan van der Molen ◽  
André Seinen
Keyword(s):  
Shell Growth ◽  
Sediment Quality ◽  
Ecological Engineering ◽  
Cost Effective ◽  
Growth Conditions ◽  
Sustainable Food ◽  
Marine Aquaculture ◽  
Growth And Survival ◽  
Meat Content ◽  
Sediment Loads

Whilst the demand for nutritious and sustainable seafood is increasing, fishing yields are declining due to overfishing and climate change. The inshore aquaculture of marine molluscs—e.g., the suspension-feeding cockle Cerastoderma edule for NW Europe—might be an alternative practice if cost-effective and nature-based technology enhances growth and survival. Our inshore experiments revealed that increasing the seawater residence time resulted in improved water quality. The reduction in sediment loads and stimulation of pelagic microalgal growth resulted in enhanced shell growth and meat content of the wild cockles seeded into the system. Shorter residence times resulted also in an increase in benthic microalgae, but the concurrent increase in silt content of the sediment appeared to hamper effective filtration by cockles. The growth conditions (with respect to the water and sediment quality) for the inshore cultivation of cockles can indeed be improved by means of ecological engineering, suggesting that the inshore aquaculture of marine shellfish can provide sustainable food and income for coastal communities, in particular when the shellfish farms are located in low-lying salinized coastal areas where common agriculture practices are no longer profitable. The involvement of the shellfishery industry was and will be crucial for studying and understanding the complex practice of cockle cultivation.

Sign in / Sign up

Export Citation Format

Share Document