scholarly journals Potencijal rasprostranjenih plutajućih vodenih biljaka rijeke Bosut u proizvodnji bioplina

Krmiva ◽  
2020 ◽  
Vol 61 (2) ◽  
pp. 57-64
Author(s):  
Damir Matošević ◽  
Davor Kralik ◽  
Irena Rapčan ◽  
Daria Jovičić
Keyword(s):  
Lemna Minor ◽  
Spirodela Polyrhiza ◽  
Azolla Caroliniana

Cilj istraživanja je utvrditi prinos bioplina i metana iz gnojovke s dodatkom tri vrste vodenih biljaka (Spirodela polyrhiza, Azolla caroliniana i Lemna minor). Uzgoj tradicionalno korištenih biljaka (npr. kukuruz, uljana repica) za dobivanje biogoriva zahtijeva obradive površine, dok se vodene biljke, kao alternativa, mogu prikupiti iz prirode, a zbog jednostavne građe, brzine rasta i povoljnog kemijskog sastava mogu se bez pred-tretmana koristiti kao osnovna ili dopunska sirovina u bioplinskim postrojenjima. Četiri uzorka (kontrola i tri vrste vodenih biljaka) u tri ponavljanja povrgnuta su anaerobnoj digestiji. Različite vrste proizvode različite količine bioplina u odnosu na kontrolu (od 504,83 do 881,62 mL g-1 S.T.). Udio dobivenog metana iznosi od 57,96 do 60,63 % u zavisnosti od biljne vrste. Ovo ukazuje na izuzetan potencijal korištenja ovih vrsta za dobivanje bioplina i metana.

scholarly journals Potencial de plantas acuáticas para la remoción de coliformes totales y Escherichia coli en aguas negras

Enfoque UTE ◽  
2018 ◽  
Vol 9 (4) ◽  
pp. 131-144
Author(s):  
R León ◽  
Beatriz Margarita Pernía Santos ◽  
Rosa Siguencia ◽  
S Franco ◽  
A Noboa ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Eichhornia Crassipes ◽  
Lemna Minor ◽  
Pistia Stratiotes ◽  
Azolla Caroliniana ◽  
E Coli

El objetivo de la investigación fue encontrar plantas acuáticas con potencial de remover E. coli y coliformes totales de agua contaminada. Para ello, se realizaron muestreos en Río Guayas, Recinto Aguas Frías y Estero Peñafiel, donde se seleccionaron las especies: Azolla caroliniana, Eichhornia crassipes, Pistia stratiotes, Salvinia auriculata y Lemna minor (Control positivo). Las plantas se reprodujeron in vitro y se realizaron bioensayos para verificar su capacidad de remover E. coli y coliformes. Los ensayos se realizaron por triplicado en 0,5 L de agua con fertilizante y se inoculó una cepa de referencia E. coli ATCC25922.  Como control negativo se inoculó la bacteria sin plantas y control positivo con la planta Lemna sp. Después de 7 días se determinó la carga bacteriana remanente. Se encontró un porcentaje de eliminación de E. coli de 99% para A. caroliniana, E. crassipes y Lemna sp. y de 100% para P. stratiotes y S. auriculata. Posteriormente, se realizaron ensayos con aguas negras en los cuales S. auriculata y A. caroliniana lograron el 100% de remoción de las coliformes y E. coli el resto de plantas tuvieron niveles menores de eficiencia. Se propone el uso de estas especies para el tratamiento de aguas contaminadas. 

Studies of the Byron Bog in Southwestern Ontario: IX. Insects Trapped as Adults Emerging from Redmond's Pond

1958 ◽  
Vol 90 (10) ◽  
pp. 623-627 ◽  
Author(s):  
W. W. Judd
Keyword(s):  
Lemna Minor ◽  
Thick Layer ◽  
Flax Seed ◽  
Spirodela Polyrhiza ◽  
Adjacent Edge ◽  
Chamaedaphne Calyculata ◽  
Northeast Corner ◽  
Utricularia Vulgaris

In the description of the Byron Bog (Judd, 1957a) it was pointed out that Redmond's Pond is situated in the northwest corner of the bog and that during 1956 a tent-trap was anchored in a small bay in the northeast corner of the pond to trap insects emerging as adults from the water. The position of the trap on the pond is shown in the map accompanying the description of the bog (Judd, 1957a) and the structure and use of the trap are also described by Judd (1957b). The trap was placed on the water on May 15, 1956 and remained there until November 8. It was about four feet from the edge of the pond in water about two feet deep. At this point the bottom of the pond was composed of a thick layer of loose, brown peat and the adjacent edge of the pond was occupied by a dense growth of leatherleaf, Chamaedaphne calyculata, growing in Sphagnum (Judd, 1957a). The branches of the bushes of leatherleaf extended out over the water of the small bay in which the trap floated. The only rooted plant growing in and around the trap was spatterdock, Nuphar advena. Floating in the water was a sparse growth of bladderwort, Utricularia vulgaris, and on the surface of the water there were a few scattered fronds of duckweed, Lemna minor, and water flax-seed, Spirodela polyrhiza.

scholarly journals Comparative Analysis of Microbial Communities in Fronds and Roots of Three Duckweed Species: Spirodela polyrhiza, Lemna minor, and Lemna aequinoctialis

2020 ◽  
Vol 35 (3) ◽  
pp. n/a
Author(s):  
Tomoki Iwashita ◽  
Yasuhiro Tanaka ◽  
Hideyuki Tamaki ◽  
Yasuko Yoneda ◽  
Ayaka Makino ◽  
...  
Keyword(s):  
Comparative Analysis ◽  
Microbial Communities ◽  
Lemna Minor ◽  
Spirodela Polyrhiza

Effects of nickel on the chloroplasts of the duckweeds Spirodela polyrhiza and Lemna minor and their possible use in biomonitoring and phytoremediation

Chemosphere ◽  
2010 ◽  
Vol 78 (3) ◽  
pp. 216-223 ◽  
Author(s):  
K.-J. Appenroth ◽  
K. Krech ◽  
Á. Keresztes ◽  
W. Fischer ◽  
H. Koloczek
Keyword(s):  
Lemna Minor ◽  
Spirodela Polyrhiza

scholarly journals Manganese accumulation and its effects on three tropical aquatic macrophytes: Azolla caroliniana, Salvinia mínima and Spirodela polyrhiza

Rodriguésia ◽  
2011 ◽  
Vol 62 (4) ◽  
pp. 909-917 ◽  
Author(s):  
Claudineia Lizieri ◽  
Rosane Aguiar ◽  
Kacilda Naomi Kuki
Keyword(s):  
Aquatic Macrophytes ◽  
Low Cost ◽  
Carotenoid Content ◽  
Human Populations ◽  
Spirodela Polyrhiza ◽  
Azolla Caroliniana ◽  
Total Chlorophyll Content ◽  
Accumulation Mechanism ◽  
Mn Content ◽  
High Concentrations

Abstract The phytoremediation technique, which consists of using plants to remove ions, has been increasingly chosen over past decades due to its low-cost technology to mitigate contaminated areas. The aim of this study was to evaluate the potential of the aquatic macrophytes, Azolla caroliniana Willd, Salvinia minima Baker and Spirodela polyrhiza (L.) Schleiden, to accumulate manganese (Mn), an element which, at high concentrations, may be toxic to human populations. The three species accumulated Mn in their tissues and the absorption was independent of the metal concentration in the solution. Spirodela polyrhiza accumulated Mn at higher concentrations of the ion (17.062 mg g-1 MS), followed by S. minima (4.283 mg g-1 MS) and A. caroliniana (1.341 mg g-1 MS). Manganese excess reduced total chlorophyll content in all three species. Carotenoid content was reduced in A. caroliniana (27.02 %) and S. polyrhiza (25.34 %). Growth was only significantly reduced (21.34%) in S. polyrhiza. The species A. caroliniana and S. minima were able to tolerate excess Mn, but were inefficient regarding the accumulation of high concentrations of the metal. High accumulated Mn content in the tissues of S. polyrhiza suggests that the species is able to accumulate this element. Therefore, it has potential for use in phytoremediation and provides a new resource for exploring the Mn accumulation mechanism.

scholarly journals Estimation of the SNP mutation rate in two vegetatively propagating species of duckweed

2020 ◽  
Author(s):  
George Sandler ◽  
Magdalena Bartkowska ◽  
Aneil F. Agrawal ◽  
Stephen I. Wright
Keyword(s):  
Salt Stress ◽  
Mutation Rate ◽  
Mutation Detection ◽  
De Novo ◽  
Lemna Minor ◽  
Tree Of Life ◽  
Mutation Rates ◽  
Spirodela Polyrhiza ◽  
Cell Lineages ◽  
Multiple Cell

AbstractMutation rate estimates for vegetatively reproducing organisms are rare, despite their frequent occurrence across the tree of life. Here we report mutation rate estimates in two vegetatively reproducing duckweed species, Lemna minor and Spirodela polyrhiza. We use a modified approach to estimating mutation rates by taking into account the reduction in mutation detection power that occurs when new individuals are produced from multiple cell lineages. We estimate an extremely low per generation mutation rate in both species of duckweed and note that allelic coverage at de novo mutation sites is very skewed. We also find no substantial difference in mutation rate between mutation accumulation lines propagated under benign conditions and those grown under salt stress. Finally, we discuss the implications of interpreting mutation rate estimates in vegetatively propagating organisms.

scholarly journals Duckweed roots are dispensable and are on a trajectory toward vestigiality

2022 ◽  
Author(s):  
Anthony Bishopp ◽  
Alexander Ware ◽  
Dylan H Jones ◽  
Paulina Flis ◽  
Kellie E Smith ◽  
...  
Keyword(s):  
Plant Growth ◽  
Lemna Minor ◽  
Normal Growth ◽  
Root Anatomy ◽  
Pistia Stratiotes ◽  
Complex Root ◽  
Spirodela Polyrhiza ◽  
Mineral Profile ◽  
Root Excision

Duckweeds are morphologically simplified, free floating aquatic monocots comprising both rooted and rootless genera. This has led to the idea that roots in these species may be vestigial, but empirical evidence supporting this is lacking. Here we show that duckweed roots are no longer required for their ancestral role of nutrient uptake. Comparative analyses of nearly all rooted duckweed species revealed a highly reduced anatomy, with greater simplification in the more recently diverged genus Lemna. A series of root excision experiments demonstrated that roots are dispensable for normal growth in Spirodela polyrhiza and Lemna minor. Furthermore, ionomic analyses of fronds in these two species showed little difference in the elemental composition of plants in rooted versus root-excised samples. In comparison, another free-floating member of the Araceae, Pistia stratiotes, which colonized the aquatic environment independently of duckweeds, has retained a more complex root anatomy. Whilst Pistia roots were not absolutely required for growth, their removal inhibited plant growth and resulted in a broad change in the mineral profile of aerial tissues. Collectively, these observations suggest that duckweeds and Pistia may be different stages along a trajectory towards root vestigialisation Given this, along with the striking diversity of root phenotypes, culminating in total loss in the most derived species, we propose that duckweed roots are a powerful system with which to understand organ loss and vestigiality.

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