Effect of Pendimethalin on Growth and Photosynthetic Activity of Protosiphon botryoides in Different Nutrient States

Shabana, E. F.; Battah, Mohamed; Kobbia, I. A.; Eladel, Hamed

doi:10.1006/eesa.2000.1942

Cited by 21 publications

(7 citation statements)

References 23 publications

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“…The data in Table ( 6) shows that in both seasons, the count of N 2 -fixing cyanobacteria increased under pendimethalin and penoxsulam application compared with the control up to 30 days from herbicidal applications, penoxsulam increased the cyanobacterial count compared with pendimethalin. These results are in agreement with Okmen et al (2013), Shabana et al (2001) and Das et al (2015). The maximum figures after 30 days of application were 3.30 and 3.29 CFU×10 3 ̸ g dry weight soil for the two seasons, respectively.…”

Section: Native N 2 -Fixing Cyanobacteria As Affected By the Interactsupporting

confidence: 93%

“…Applying herbicides were found by Das et al (2015) safe for cyanobacteria and enhancers of rice production. High pendimethalin concentrations decreased growth rate, cell count, chlorophyll and dry weight of the green alga Protosiphon botryoides (Shabana et al, 2001 andZvir et al, 2015). However, a positive correlation was found between sulphate reducing and nitrogen-fixing activity in flooded soils (Sidorenko, 1989).…”

Section: Introductionmentioning

confidence: 90%

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Influence of Herbicides on Population Densities of Certain Soil Microflora, Weed Control and Drill-Seeded Rice Productivity

Abdelgawad

El-Naby

2018

Journal of Agricultural Chemistry and Biotechnology

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This study was conducted at the Experimental Farm of rice department, Sakha Agricultural Research Station, Egypt during 2015 and 2016 summer seasons to investigate the effect of recommended doses from Stomp (pendimethalin 50% EC) and Rainbow (penoxsulam 2.5% OD) herbicides on weed control, microbial activities and rice productivity under drill-seeded rice cultivation. Total bacterial count, N 2 -fixing bacteria, N 2 -fixing cyanobacteria, nitrifiers and sulfate-reducing bacteria were counted at different periods of crop growth. Dry weight of Echinochloa crus-galli, Echinochloa colona, Ammania baccifera and total weeds were measured at 45 and 60 DAS. Paddy rice dry weight at 45 and 60 DAS, number of panicles, panicle weight and grain yield were determined. The results revealed that total bacterial count, nitrogen-fixing bacteria, native N 2 -fixing cyanobacteria and nitrifying bacteria were increased with penoxsulam application, while sulphate reducers were decreased in both seasons compared with application of pendimethalin and the untreated control. Penoxsulam application significantly decreased dry weight of Echinochloa crus-galli, Echinochloa colona and total weeds. While increased rice dry weight, number of panicles/m 2 , panicle weight and grain yield of rice in the two growing seasons.

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Section: Native N 2 -Fixing Cyanobacteria As Affected By the Interactsupporting

confidence: 93%

Section: Introductionmentioning

confidence: 90%

Influence of Herbicides on Population Densities of Certain Soil Microflora, Weed Control and Drill-Seeded Rice Productivity

Abdelgawad

El-Naby

2018

Journal of Agricultural Chemistry and Biotechnology

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“…and were prepared to a Chl concentration of 5 µg/mL and frozen in liquid nitrogen. From each sample immersed in liquid nitrogen, the fluorescence emission was measured in an F-4500 spectrofluorometer (Hitachi, Tokyo, Japan) equipped with a low temperature accessory and using an internal standard (Saskia et al 2003;Shabana et al 2001). The fluorescence emission was recorded from 600 to 800 nm with an excitation wavelength of 436 nm.…”

Section: Low-temperature (77 K) Fluorescencementioning

confidence: 99%

Physiological and Biochemical Changes inMicrocystis aeruginosaQutz. in Phosphorus Limitation

Ou¹,

Cai²

2005

Journal of Integrative Plant Biology

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Effects of phosphorus limitation on the physiological and biochemical changes of the freshwater bloom alga Microcystis aeruginosa Qutz. are reported in the present study. As a result of phosphorus limitation, biomass was controlled to some extent and the protein content per cell in vivo decreased. However, the carbohydrate content per cell was higher in phosphorus limitation over the 8 d of cultivation. Soluble proteins were distinct in the media, whereas phosphorus deficiency induced the presence of a unique protein (16.2 kDa). Under conditions of phosphorus limitation, the activities of both superoxide dismutase and peroxidase per cell in vivo were lower than under normal conditions in the last cultivation. The in vivo absorption spectra of cells showed chlorophyll absorption peaks at 676 and 436 nm, over 10 nm red-shifted from the normal position; cells showed an absence of a chlorophyll c with an in vivo absorption peak at 623 nm and an extraction absorption peak at 617 nm. The chlorophyll a/carotene and chlorophyll a/xanthophylls ratios decreased under conditions of phosphorus limitation, photosynthetic efficiency (Fv/Fm) was clearly lower, and the low-temperature fluorescence emission spectra indicated a higher peak at 683 nm and a lower peak at 721 nm relatively, with the 721 nm peak drifting slightly to the red and the 683 nm peak strengthened with a weakened 692 nm shoulder peak.

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“…Several parameters can be measured to assess the effects of toxicants on microalgae, being growth and photosynthetic activity the most commonly monitored (Cleuvers, 2003;Shabana et al, 2001;Yang et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Suitability of cytotoxicity endpoints and test microalgal species to disclose the toxic effect of common aquatic pollutants

Prado

García

Rioboo

et al. 2015

Ecotoxicology and Environmental Safety

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Pulse discharges of chemicals to aquatic environments may lead to high concentrations of them in surface waters for short periods of time, but enough to induce toxic effects on aquatic organisms; however, no many methods allow an early warning of toxicity of these agents. Acute effects of one representative chemical from each of three of the main groups of aquatic pollutants (pesticides, metals and pharmaceuticals) are studied on two green microalgal species (Chlamydomonas moewusii and Chlorella vulgaris). Flow cytometry protocols were used to detect the potential application of chlorophyll a fluorescent emission, cell viability, metabolic activity and membrane potential as cytotoxicity endpoints, besides an epifluorescence microscopy protocol for comet assay to detect genotoxicity level of cells. Obtained results confirm the suitability of them for the prospective assessment of the potential cytotoxicity of these aquatic pollutants. The two microalgal species analysed could be used as indicators in toxicity bioassays, being C. moewusii more sensitive than C. vulgaris. Among cell parameters assayed, the metabolic activity and the primary DNA damage stood out as sensitive cytotoxicity endpoints.

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Effect of Pendimethalin on Growth and Photosynthetic Activity of Protosiphon botryoides in Different Nutrient States

Cited by 21 publications

References 23 publications

Influence of Herbicides on Population Densities of Certain Soil Microflora, Weed Control and Drill-Seeded Rice Productivity

Influence of Herbicides on Population Densities of Certain Soil Microflora, Weed Control and Drill-Seeded Rice Productivity

Physiological and Biochemical Changes inMicrocystis aeruginosaQutz. in Phosphorus Limitation

Suitability of cytotoxicity endpoints and test microalgal species to disclose the toxic effect of common aquatic pollutants

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