Effects of seven forestry management herbicides on Myriophyllum sibiricum, as compared with other nontarget aquatic organisms

1999 ◽  
Vol 29 (7) ◽  
pp. 1158-1169 ◽  
Author(s):  
Roxana D Roshon ◽  
Janet H McCann ◽  
Dean G Thompson ◽  
Gerald R Stephenson
Keyword(s):  
Root Growth ◽  
Aquatic Plants ◽  
Aquatic Organisms ◽  
High Sensitivity ◽  
Dry Mass ◽  
Sulfometuron Methyl ◽  
Metsulfuron Methyl ◽  
Myriophyllum Sibiricum ◽  
Floating Macrophytes ◽  
2,4 Dichlorophenoxyacetic Acid

Historically, studies on the nontarget aquatic effects of forest-use herbicides focused largely on fish and invertebrates despite the ecological importance of aquatic plants. Regulatory requirements and the aquatic phytotoxicity database need to be improved to reflect the importance of aquatic plants. Based on a review of the scientific literature and results from laboratory testing with the submersed macrophyte Myriophyllum sibiricum Komarov, the effects of 2,4 dichlorophenoxyacetic acid (2,4-D), glyphosate, hexazinone, imazapyr, metsulfuron methyl, sulfometuron methyl, and triclopyr on nontarget aquatic organisms were compared. Laboratory results indicate that M. sibiricum is sensitive to herbicide effects, especially those that impact root growth. For most herbicides, the inhibitory concentrations 25 and 50 (IC25 and IC50, concentrations that inhibit an endpoint parameter by 25 and 50%, respectively) for shoot and root growth were below the expected environmental concentrations (EEC). For example, the IC50 values for root dry mass were 0.000 12 and 0.000 22 mg active ingredient/L for sulfometuron methyl and metsulfuron methyl, respectively, concentrations that were approximately 3100 and 1700 times below the EEC for these compounds. Interspecies comparisons, conducted during this study, demonstrated that M. sibiricum was generally equally or more sensitive to these herbicides than other aquatic plant species (i.e., floating macrophytes and algae) and, in some cases, more sensitive than fish, zooplankton, and other invertebrates. For example, available data demonstrated that 2,4-D, imazapyr, and the sulfonylureas investigated were more toxic to rooted and floating macrophytes than to other aquatic organisms, including algae. Because of the high sensitivity and ecological significance of aquatic macrophytes, a greater emphasis should be placed on evaluating aquatic phytotoxicity in future ecotoxicological research.

scholarly journals Influence of biostimulant and substrate volume on root growth and development of scarlet sage (Salvia splendens L.) transplants

2010 ◽  
Vol 55 (1) ◽  
pp. 29-36 ◽  
Author(s):  
Svjetlana Zeljkovic ◽  
Nada Paradjikovic ◽  
Tamara Babic ◽  
Gordana Djuric ◽  
Rodoljub Oljaca ◽  
...  
Keyword(s):  
Root Growth ◽  
Growth And Development ◽  
Untreated Control ◽  
Dry Mass ◽  
Adaptation To Stress ◽  
Plant Adaptation ◽  
Salvia Splendens ◽  
Fresh And Dry Mass ◽  
Root Growth And Development

The influence of biostimulant and substrate volume on scarlet sage transplants growth and development was examined in this investigation. There was one cultivar of scarlet sage used in trial which was transplanted in pots of two different volumes. Plants were treated with biostimulant (Radifarm) in concentration of 0.25% or left untreated (control). During the trial, root and aboveground fresh and dry mass were recorded. Treatment with biostimulant and bigger substrate volume showed good results by increasing investigated parameters. Investigation shows how biostimulant application to scarlet sage transplants production improves growth and development of root and aboveground mass which is important for faster plant adaptation to stress during transplanting.

scholarly journals Callogenesis in Cicer arietinum and identification of a genotype resistant to Ascochyta rabiei

2020 ◽  
Vol 12 (3) ◽  
pp. 673-682
Author(s):  
Yasmina BENABDESSLEM ◽  
Kadda HACHEM ◽  
Samia GHOMARI
Keyword(s):  
Cicer Arietinum ◽  
Crop Yields ◽  
High Sensitivity ◽  
Ascochyta Rabiei ◽  
Dichlorophenoxyacetic Acid ◽  
Ms Medium ◽  
Fruiting Bodies ◽  
Callus Tissues ◽  
2,4 Dichlorophenoxyacetic Acid ◽  
Indole 3 Acetic Acid

The chickpea (Cicer arietinum) is one of the leguminous species most appreciated by consumers in the Mediterranean basin, while being an important source of protein. Nevertheless, its crop yields are greatly limited by several biotic and abiotic stresses, the main one being Ascochyta rabiei, the causal agent of anthracnose. As traditional breeding methods have proved to be ineffective in controlling this pathogen, resorting to biotechnological methods is necessary. Therefore, in this study, the callogenic capacity of stem and leaflet explants from three genotypes of chickpea, namely ‘FLIP 84-92 C’, ‘ILC 32-97’, and ‘ILC 263’, cultured on Murashige and Skoog (MS) medium with different hormonal balances of auxins (indole-3-acetic acid [IAA] and 2,4-dichlorophenoxyacetic acid [2,4-D]) and cytokinin (kinetin), was determined. For all the genotypes, high percentages of callogenesis were recorded in the different explants grown on an MS medium with 2 mg of both IAA and kinetin. Then, a patho-system of Cicer arietinum calluses with Ascochyta rabiei was investigated, followed by a histological assessment of this interaction. The presence of the fruiting bodies of the pathogen was revealed in the calluses of the ‘ILC 32-97’ and ‘ILC 263’ genotypes. Notably, the latter showed a high sensitivity to the pathogen, as indicated by an abundance of pycnidia in its tissues. As for the ‘FLIP 84-92 C’ genotype, the histological sections showed a total absence of inter- and intracellular fruiting bodies of the pathogen in the callus tissues. Therefore, this genotype was considered as resistant to Ascochyta rabiei.

scholarly journals Pre-Sowing Irrigation Plus Surface Fertilization Improves Morpho-Physiological Traits and Sustaining Water-Nitrogen Productivity of Cotton

Agronomy ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 772
Author(s):  
Zongkui Chen ◽  
Hongyun Gao ◽  
Fei Hou ◽  
Aziz Khan ◽  
Honghai Luo
Keyword(s):  
Nitrate Reductase ◽  
Root Growth ◽  
Root Length ◽  
Crop Production ◽  
Nitrate Reductase Activity ◽  
Reductase Activity ◽  
Soil Layer ◽  
Dry Mass ◽  
Cotton Production ◽  
Nitrogen Productivity

The changing climatic conditions are causing erratic rains and frequent episodes of moisture stress; these impose a great challenge to cotton productivity by negatively affecting plant physiological, biochemical and molecular processes. This situation requires an efficient management of water-nutrient to achieve optimal crop production. Wise use of water-nutrient in cotton production and improved water use-efficiency may help to produce more crop per drop. We hypothesized that the application of nitrogen into deep soil layers can improve water-nitrogen productivity by promoting root growth and functional attributes of cotton crop. To test this hypothesis, a two-year pot experiment under field conditions was conducted to explore the effects of two irrigation levels (i.e., pre-sowing irrigation (W80) and no pre-sowing irrigation (W0)) combined with different fertilization methods (i.e., surface application (F10) and deep application (F30)) on soil water content, soil available nitrogen, roots morpho-physiological attributes, dry mass and water-nitrogen productivity of cotton. W80 treatment increased root length by 3.1%–17.5% in the 0–40 cm soil layer compared with W0. W80 had 11.3%–52.9% higher root nitrate reductase activity in the 10–30 cm soil layer and 18.8%–67.9% in the 60–80 cm soil layer compared with W0. The W80F10 resulted in 4.3%–44.1% greater root nitrate reductase activity compared with other treatments in the 0–30 cm soil layer at 54–84 days after emergence. Water-nitrogen productivity was positively associated with dry mass, water consumption, root length and root nitrate reductase activity. Our data highlighted that pre-sowing irrigation coupled with basal surface fertilization is a promising option in terms of improved cotton root growth. Functioning in the surface soil profile led to a higher reproductive organ biomass production and water-nitrogen productivity.

scholarly journals Auxins Regulations of Branched Spike Development and Expression of TFL, a LEAFY-Like Gene in Branched Spike Wheat (Triticum aestivum)

2017 ◽  
Vol 9 (2) ◽  
pp. 27
Author(s):  
Wang Yue ◽  
Sun Fulai ◽  
Gao Qingrong ◽  
Zhang Yanxia ◽  
Wang Nan ◽  
...  
Keyword(s):  
Photosynthetic Pigment ◽  
Dry Mass ◽  
Dichlorophenoxyacetic Acid ◽  
Naphthaleneacetic Acid ◽  
Branched Spike ◽  
Spike Development ◽  
2,4 Dichlorophenoxyacetic Acid ◽  
The Impact ◽  
Indole 3 Acetic Acid ◽  
Putative Homologue

Branched spike wheat is a hexaploid germplasm with branched rachis on its main rachises, and the crucial period for branched rachises occurrence and development is just after the two ridges stage of shoot apex. Natural [indole-3-acetic acid (IAA), indole-3butyric acid (IBA)] and synthetic [(1-naphthaleneacetic acid (NAA), 2,4-Dichlorophenoxyacetic acid (2,4-D)] auxins were applied at this period to investigate the spike traits, seedling growth and photosynthesis related characters and expression of a putative homologue of the LEAFY in branched spike wheat. The four types of experienced auxins induced similar effects on these foresaid characters, although the impact extents were different among the auxins treatments. More branched rachis, spikelets, fertile florets and longer branched rachis were obtained in plants with IAA and IBA at 0.1 mM or NAA and 2,4-D at 1.0mM than those plants with no auxin treated. Auxin treatments also increased fresh and dry mass, photosynthetic pigment and parameters. TFL, a LEAFY-like gene was cloned in branched spike wheat and TFL mRNA expression was quantified using real-time reverse transcriptase-PCR. Application of the auxins accelerated the rise in TFL expression during the periods of branched rachises occurrence and extension. The data supports the hypothesis that auxins play a central role in the regulation branched spike development and TFL might correlate with the development of branched rachises in branched spike wheat.

scholarly journals Toxicity Studies of Ametryne to Land and Aquatic Organisms

2017 ◽  
Vol 6 (1) ◽  
pp. 8
Author(s):  
Ana Paula Justiniano Régo ◽  
Ederio Dino Bidoia ◽  
Cassiana Maria Reganhan-Coneglian
Keyword(s):  
Seed Germination ◽  
Root Growth ◽  
Test Organism ◽  
Aquatic Organisms ◽  
Terrestrial Ecosystems ◽  
Toxic Effects ◽  
Eruca Sativa ◽  
Daphnia Similis ◽  
Low Concentrations ◽  
Bodies Of Water

The ametryne herbicide is largely used on sugar cane plantation in Brazil. It is persistent in the environment and can be found in bodies of water, impacting the aquatic and terrestrial ecosystems. Generally, in crops are applied mixtures of herbicides in order to obtain a higher success in combating weeds. This study evaluated the toxicity only of ametryne herbicide, without mixture with other herbicides, in order to quantify only the degree of dangerousness. This work evaluated the toxicity of ametryne to one aquatic test organism (Daphnia similis) and two land test organism (Eruca sativa and Lactuca sativa). Immobility of D. similis was evaluated in the presence of ametryne. Influences of ametryne on seed germination and root growth of E. sativa and L. sativa were evaluated. Even at low concentrations (5.00 mg/L), ametryne caused toxic effects on the mobility of D. similis, and 0.25 g/L caused toxic effects on the seeds. Root growth and the percentage of inhibition showed greater sensitivity to ametryne compared with seed germination. Thus, ametryne resulted in toxic effects to the analyzed organisms, which may bring damage to both aquatic and terrestrial ecosystems.

Growth of Loblolly Pine Treated With Hexazinone, Sulfometuron Methyl, and Metsulfuron Methyl For Herbaceous Weed Control

1985 ◽  
Vol 9 (1) ◽  
pp. 20-26 ◽  
Author(s):  
J. L. Michael
Keyword(s):  
Weed Control ◽  
Loblolly Pine ◽  
Control Treatment ◽  
Silty Clay ◽  
Growth Responses ◽  
Deer Browsing ◽  
Sulfometuron Methyl ◽  
Evening Primrose ◽  
Metsulfuron Methyl ◽  
Herbaceous Weed Control

Abstract Aerial application of 0.25 pounds active ingredient per acre of sulfometuron methyl [Oust(TM), formerly DPX-5648] or 2.0 pounds of hexazinone [Velpar L (TM)] postemergent in May 1982, resulted in good weed control. Weeds controlled on the silty clay coastal plain soil included pokeweed (Phytolacca americana L.), ragweed (Ambrosia sp.), goldenrod (Solidago sp.), and evening primrose (Oenothera sp.). Growth of 1-year-old loblolly pine (Pinus taeda L.) seedlings released with sulfometuron methyl or hexazinone was significantly improved in comparison to untreated seedlings. No significant pine mortality was associated with either treatment. On similar sites where blackberry (Rubus sp.), honeysuckle (Lonicera japonica Thunberg), and herbaceous weeds are the major problem, application of sulfometuron methyl from pre-emergence to the postemergent stage (when weeds are up to 12 to 18 inches in height) is recommended. Hexazinone is recommended as a postemergent treatment for herbaceous weed control. Treatment with metsulfuron methyl (formerly DPX-T6376-21) did not result in any growth responses significantly greater than untreated seedlings. Impacts of deer browsing on seedlings resulted in a slight height reduction the first and second growing seasons following planting but by the end of the third growing season browsed seedlings had made up the difference. No diameter differences were associated with deer browsing at any time during the study.

Growth-regulating properties of picloram, 4-amino-3,5,6-trichloropicolinic acid

1971 ◽  
Vol 49 (6) ◽  
pp. 889-897 ◽  
Author(s):  
W. R. Eisinger ◽  
D. J. Morré
Keyword(s):  
Root Growth ◽  
Growth Regulator ◽  
Root Growth Inhibition ◽  
Dichlorophenoxyacetic Acid ◽  
Cell Wall Loosening ◽  
2,4 Dichlorophenoxyacetic Acid ◽  
Stem Curvature ◽  
Wall Loosening ◽  
Indole 3 Acetic Acid ◽  
Curvature Test

Picloram, 2,4-D (2,4-dichlorophenoxyacetic acid) and IAA (indole-3-acetic acid) cause similar stimulations of polarized cell elongation in stem and coleoptile sections floated on solutions containing the growth regulator. Picloram, like 2,4-D and IAA, supports growth of tissue explants in culture, inhibits root growth, induces cell wall loosening, produces stem curvature and other formative effects, promotes loss of chlorophyll, and regulates abscission and rooting responses. A kinetic analysis of root growth inhibition indicates a common mode of action for picloram and 2,4-D. Picloram meets the minimal structural requirements for auxin activity. The greater herbicidal effectiveness of picloram is attributed to increased mobility and resistance to breakdown within the plant. The ability of picloram to increase markedly the growth of intact shoot cuttings is not shared by either 2,4-D or IAA and neither picloram nor 2,4-D are readily transported in a polar manner in the Avena curvature test. We conclude that picloram functions as a growth regulator of the auxin type with a herbicidal action similar to that of 2,4-D.

scholarly journals MERCURY IN THE SANTA CRUZ CHANNEL, NE BRAZIL - A POTENTIAL RISK

2017 ◽  
Vol 45 (2) ◽  
Author(s):  
Ute MEYER ◽  
Carmen MEDEIROS
Keyword(s):  
Suspended Matter ◽  
Sediment Cores ◽  
Size Fraction ◽  
Aquatic Organisms ◽  
Dry Mass ◽  
Coastal Areas ◽  
Mercury Contamination ◽  
Santa Cruz ◽  
Mangrove Sediments ◽  
Secondary Sources

This work evaluated the level of mercury contamination in a mangrove system (Santa Cruz Channel) a couple of years after Hg discharge into its main tributary (Botafogo River) ceased, as well as the role of mangrove sediments as sinks or secondary sources of mercury whiting the system and/or to coastal areas. Mangrove oysters, suspended matter and sediment cores representing different compartments of the Channel and seasonal and tidal stages were analyzed. Mercury concentrations was 0.27-2.21 ppm (dry mass DM) in mangrove oysters; 0.04-6.20 ppm in total sediment (DM) and 0.3-20.5 ppm in relation to the grain size fraction <63 μm. Mercury concentrations in suspended matter were between 0.43-5.56 ppm (DM), corresponding to 4-175 ngL-1 particulate mercury. Results corroborates the importance of fine and organic-rich matter for the accumulation of mercury but also indicated that mangrove sediments do not function as a long-term trap for Hg. Instead, mercury is remobilized from the sediments, presumably as bioavailable species. As the export to coastal areas is small, a large portion of the remobilized Hg probably cycles within the system or is released into the air. Both processes represent a considerable risk for aquatic organisms and humans exposed to the mercury.

scholarly journals Container Volume Affects Growth and Development of Wax-apple

HortScience ◽  
1996 ◽  
Vol 31 (7) ◽  
pp. 1139-1142 ◽  
Author(s):  
Y.M. Hsu ◽  
M.J. Tseng ◽  
C.H. Lin
Keyword(s):  
Root Growth ◽  
Effective Means ◽  
Experimental Period ◽  
Dry Mass ◽  
Cross Sectional ◽  
Tropical Fruit ◽  
Leaf Dry Mass ◽  
Forcing Culture ◽  
One Year ◽  
Root Restriction

The wax-apple [Syzygium samarangense (Bl.) Merr. & Perry] is a vigorous tropical fruit tree species that has five to six growth flushes per year. One-year-old, root-bearing wax-apple trees were grown in different-sized containers filled with potting mixture to test if container volume restricts shoot and/or root growth and thereby lends itself to forcing culture. The trunk cross-sectional area (TCSA) at 15 cm above the soil was measured to assess vegetative growth. After 6 months, the TCSA had increased quadratically with container volume. At the end of the first and second year, leaf count, leaf area, leaf dry mass, stem dry mass, shoot dry mass, and root dry mass were positively correlated with container volume. However, the shoot: root ratios remained fairly constant among treatments during the experimental period. Thus, root restriction is an effective means of reducing shoot and root growth of the wax-apple.

scholarly journals Specialization directs habitat selection responses to a top predator in semiaquatic but not aquatic taxa

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hana Šigutová ◽  
Filip Harabiš ◽  
Martin Šigut ◽  
Jiří Vojar ◽  
Lukáš Choleva ◽  
...  
Keyword(s):  
Habitat Selection ◽  
Vegetation Structure ◽  
Aquatic Organisms ◽  
Bufo Bufo ◽  
Freshwater Ecosystems ◽  
Similar Response ◽  
Top Predator ◽  
Generalist Species ◽  
Selection Responses ◽  
Floating Macrophytes

AbstractHabitat selectivity has become an increasingly acknowledged mechanism shaping the structure of freshwater communities; however, most studies have focused on the effect of predators and competitors, neglecting habitat complexity and specialization. In this study, we examined the habitat selection of semiaquatic (amphibians: Bufonidae; odonates: Libellulidae) and aquatic organisms (true bugs: Notonectidae; diving beetles: Dytiscidae). From each family, we selected one habitat generalist species able to coexist with fish (Bufo bufo, Sympetrum sanguineum, Notonecta glauca, Dytiscus marginalis) and one species specialized in fishless habitats (Bufotes viridis, Sympetrum danae, Notonecta obliqua, Acilius sulcatus). In a mesocosm experiment, we quantified habitat selection decisions in response to the non-consumptive presence of fish (Carassius auratus) and vegetation structure mimicking different successional stages of aquatic habitats (no macrophytes; submerged and floating macrophytes; submerged, floating, and littoral-emergent macrophytes). No congruence between habitat specialists and generalists was observed, but a similar response to fish and vegetation structure defined both semiaquatic and aquatic organisms. While semiaquatic generalists did not distinguish between fish and fishless pools, specialists avoided fish-occupied pools and had a preferred vegetation structure. In aquatic taxa, predator presence affected habitat selection only in combination with vegetation structure, and all species preferred fishless pools with floating and submerged macrophytes. Fish presence triggered avoidance only in the generalist bug N. glauca. Our results highlight the significance of habitat selectivity for structuring freshwater ecosystems and illustrate how habitat selection responses to a top predator are dictated by specialization and life history.

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