The Role of Leaves in the Uptake of Nutrients by Uniola paniculata and Ammophila breviligulata

1977 ◽  
Vol 18 (1) ◽  
pp. 77 ◽  
Author(s):  
A. G. van der Valk
Keyword(s):  
Ammophila Breviligulata ◽  
Uniola Paniculata ◽  
Uptake Of Nutrients

scholarly journals Uniola paniculata (Poaceae, Chloridoideae, Unioliinae), nuevo registro para la flora de la Península de Yucatán, México

2020 ◽  
Author(s):  
Daniel Alexis Tovar-Montalvo ◽  
Monserrat Medina-Acevedo ◽  
Miguel Angel García-Bielma ◽  
Jesús Jaime Guerra-Santos
Keyword(s):  
United States ◽  
United States Of America ◽  
The United States ◽  
The State ◽  
Ecological Role ◽  
Uniola Paniculata ◽  
The Family ◽  
Sea Grass ◽  
The Caribbean

Resumen: Antecedentes y Objetivos: La avena de mar, Uniola paniculata, se distribuye en el Caribe, los Estados Unidos de América y México. El objetivo de este trabajo es reportar su presencia y registro en el estado de Campeche, México. Métodos: Se colectaron ejemplares de la familia Poaceae creciendo en una duna frontal al suroeste del estado de Campeche, específicamente en la Isla del Carmen. Las colectas fueron procesadas y herborizadas, para su conservación e identificación.Resultado clave: Con la identificación de ejemplares, y después de hacer una revisión de su distribución, se registra por primera vez la presencia de Uniola paniculata (Poaceae) en la Península de Yucatán, representando una contribución al conocimiento florístico de la región y a la flora de México.Conclusiones: Esta especie solo había sido reportada para la costa del Golfo de México, en los estados de Tamaulipas, Veracruz y Tabasco. Este registro adquiere relevancia por el papel ecológico de este pasto en las dunas costeras.Palabras clave: avena de mar, conocimiento florístico, dunas costeras, flora de Campeche.Abstract: Background and Aims: The oat sea grass, Uniola paniculata, is distributed in the Caribbean, the United States of America and Mexico. The aim of this work is to report its occurrence and record in the state of Campeche, Mexico.Methods: Individuals of the family Poaceae were collected growing in a coastal dune in the southwest of the state of Campeche, particularly on the Isla del Carmen. The collections were processed and herborized for their conservation and classification.Key results: With the individuals’ identification and after reviewing its distribution, this is the first report of the presence of Uniola paniculata (Poaceae) on the Yucatan Peninsula, representing a contribution to the floristic knowledge of the region and the flora of Mexico.Conclusions: This species had only been reported from the coast of the Gulf of Mexico in the states of Tamaulipas, Veracruz and Tabasco. This record is relevant because of the ecological role of this oat sea grass in the coastal dunes.Key words: Campeche flora, coast dunes, floristic knowledge, sea oat.

Do macrophytes play a role in constructed treatment wetlands?

1997 ◽  
Vol 35 (5) ◽  
pp. 11-17 ◽  
Author(s):  
Hans Brix
Keyword(s):  
Surface Flow ◽  
Treatment Wetlands ◽  
Treatment Processes ◽  
Aquatic Mosses ◽  
Flow Systems ◽  
Physical Effects ◽  
Removal Processes ◽  
Constructed Treatment Wetlands ◽  
Uptake Of Nutrients

The larger aquatic plants growing in wetlands are usually called macrophytes. These include aquatic vascular plants, aquatic mosses and some larger algae. The presence or absence of aquatic macrophytes is one of the characteristics used to define wetlands, and as such macrophytes are an indispensable component of these ecosystems. As the most important removal processes in constructed treatment wetlands are based on physical and microbial processes, the role of the macrophytes in these has been questioned. This paper summarizes how macrophytes influence the treatment processes in wetlands. The most important functions of the macrophytes in relation to the treatment of wastewater are the physical effects the presence of the plants gives rise to. The macrophytes stabilise the surface of the beds, provide good conditions for physical filtration, prevent vertical flow systems from clogging, insulate the surface against frost during winter, and provide a huge surface area for attached microbial growth. Contrary to earlier belief, the growth of macrophytes does not increase the hydraulic conductivity of the substrate in soil-based subsurface flow constructed wetlands. The metabolism of the macrophytes affects the treatment processes to different extents depending on the type of the constructed wetland. Plant uptake of nutrients is only of quantitative importance in low-loaded systems (surface flow systems). Macrophyte mediated transfer of oxygen to the rhizosphere by leakage from roots increases aerobic degradation of organic matter and nitrification. The macrophytes have additional site-specific values by providing habitat for wildlife and making wastewater treatment systems aesthetically pleasing.

Some Observations on the Role of the Body Wall of Acanthocephalus Ranae in Lipid Uptake

1968 ◽  
Vol 48 (1) ◽  
pp. 217-225
Author(s):  
R. A. HAMMOND
Keyword(s):  
Lipid Droplets ◽  
Body Wall ◽  
The Body ◽  
Lipid Uptake ◽  
Uptake Of Nutrients ◽  
Lipid Excretion

1. Acanthocephalus ranae has been found to take up glyceryl tri[oleate-9,10-3H] solely through the surface of the trunk. The proboscis and lemnisci play no part in the uptake of this material. The large amounts of lipid present in the latter organs may be evidence of their involvement in lipid excretion. 2. Fat-soluble dyes are taken up by the animal and accumulate in lipid droplets in the lemnisci and proboscis wall. It is suggested that such dyes do not enter the animal through the surface of the proboscis, as has been suggested previously, but through the surface of the trunk. 3. The structure of the acanthocephalan body wall is discussed in relation to the uptake of nutrients.

Arbuscular mycorrhizal fungi improve the growth and nodulation of the annual legume messina (Melilotus siculus) under saline and non-saline conditions

2012 ◽  
Vol 63 (2) ◽  
pp. 164 ◽  
Author(s):  
B. A. L. Wilson ◽  
G. J. Ash ◽  
J. D. I. Harper
Keyword(s):  
Mycorrhizal Fungi ◽  
Arbuscular Mycorrhizal ◽  
Am Fungi ◽  
Dry Weight ◽  
Salinity Level ◽  
P Nutrition ◽  
Uninoculated Control ◽  
Uptake Of Nutrients ◽  
Saline Land

Messina [Melilotus siculus (Turra) Vitman ex. B. D Jacks] is a salt- and waterlogging-tolerant annual legume that could be highly productive on saline land. Arbuscular mycorrhizal (AM) fungi form a symbiotic relationship with the majority of terrestrial plant species, and improved productivity of plants inoculated with AM fungi under saline conditions has been attributed to the increased uptake of nutrients such as phosphorus (P). However, the mycorrhizal status of M. siculus under saline or non-saline conditions is unknown, as is the role of AM in improved nutrition and nodulation. In this study, the role of AM fungi in growth improvement and nodulation of M. siculus was examined in saline and non-saline soil. The M. siculus plants were inoculated with either a single AM species or mixed AM species, or remained uninoculated, and were grown at three levels of sodium chloride (NaCl) (0, 80, and 250 mm NaCl). AM-inoculated plants had significantly greater nodulation than plants that did not receive AM inoculum, regardless of salinity level. Plants inoculated with mixed AM species at 250 mm NaCl showed improved survival (90%) compared with the plants inoculated with single AM species or uninoculated control plants (30%). Within each salinity level, plants inoculated with mixed AM species had significantly greater dry weight than all other treatments. In addition, plants inoculated with mixed AM species had increased total uptake of P. It is likely that the increased growth observed in AM-inoculated M. siculus plants is due to improved P nutrition, showing the potential of AM fungi to enhance the growth of M. siculus on saline land.

Role of the Tsc1-Tsc2 Complex in Signaling and Transport Across the Cell Membrane in the Fission Yeast Schizosaccharomyces pombe

Genetics ◽  
2002 ◽  
Vol 161 (3) ◽  
pp. 1053-1063 ◽  
Author(s):  
Sanae Matsumoto ◽  
Amitabha Bandyopadhyay ◽  
David J Kwiatkowski ◽  
Umadas Maitra ◽  
Tomohiro Matsumoto
Keyword(s):  
Fission Yeast ◽  
Protein Trafficking ◽  
Similar Process ◽  
Benign Tumors ◽  
Amino Acid Permease ◽  
Human Proteins ◽  
P Factor ◽  
Yeast Genes ◽  
Uptake Of Nutrients

Abstract Heterozygous inactivation of either human TSC1 or TSC2 causes tuberous sclerosis (TSC), in which development of benign tumors, hamartomas, occurs via a two-hit mechanism. In this study, fission yeast genes homologous to TSC1 and TSC2 were identified, and their protein products were shown to physically interact like the human gene products. Strains lacking tsc1+ or tsc2+ were defective in uptake of nutrients from the environment. An amino acid permease, which is normally positioned on the plasma membrane, aggregated in the cytoplasm or was confined in vacuole-like structures in Δtsc1 and Δtsc2 strains. Deletion of tsc1+ or tsc2+ also caused a defect in conjugation. When a limited number of the cells were mixed, they conjugated poorly. The conjugation efficiency was improved by increased cell density. Δtsc1 cells were not responsive to a mating pheromone, P-factor, suggesting that Tsc1 has an important role in the signal cascade for conjugation. These results indicate that the fission yeast Tsc1-Tsc2 complex plays a role in the regulation of protein trafficking and suggest a similar function for the human proteins. We also show that fission yeast Int6 is involved in a similar process, but functions in an independent genetic pathway.

The role of ethylene and darkness in accelerated shoot elongation of Ammophila breviligulata upon sand burial

Oecologia ◽  
1998 ◽  
Vol 115 (3) ◽  
pp. 359-365 ◽  
Author(s):  
L. A. C. J. Voesenek ◽  
W. H. van der Putten ◽  
M. A. Maun ◽  
C. W. P. M. Blom
Keyword(s):  
Shoot Elongation ◽  
Sand Burial ◽  
Ammophila Breviligulata

The role of sclerotial rind in the germinability of sclerotia of Sclerotium rolfsii

1969 ◽  
Vol 47 (4) ◽  
pp. 593-595 ◽  
Author(s):  
I. Chet
Keyword(s):  
Sclerotium Rolfsii ◽  
Iodoacetic Acid ◽  
Stages Of Development ◽  
Uptake Of Nutrients ◽  
Mechanical Barrier

Punctured sclerotia of Sclerotium rolfsii Sacc. germinated more rapidly than unpunctured ones, especially on water agar. Discs of agar with mycelium and sclerotia in different stages of development were transferred to medium supplemented with 14C-iodoacetic acid. The radioisotope was not incorporated into mature sclerotia. It was concluded that the sclerotial rind is a mechanical barrier preventing uptake of nutrients from the medium.

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