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Kylie John

Drought-induced injury is associated with hormonal alteration in Kentucky bluegrass - PMC - 0 views

www.ncbi.nlm.nih.gov/...PMC6768267

HSR-2025 HSR botany hormones lawngrass

shared by Kylie John on 20 Sep 24 - No Cached
  • Mature KBG (cv. ‘Wildhorse’) plugs (10 cm diameter, 5 cm deep)
  • The grass was transplanted into pots (15 cm diameter, 15 cm deep, with 8 holes on the bottom) filled with either top soil and sand mixture (2:1, v/v). A piece of plastic screen was placed in the bottom of the pot to prevent soil from leaching.
  • at optimum conditions (mean±SD) at 22 ± 0.8/16 ± 0.6°C (day/night), 70%±8% relative humidity, PAR at 400 ± 9 µmol m−2 s−1 and 12-h photoperiod. Nitrogen was applied at 2 g m−2 (from 28–8-18 complete fertilizer with micronutrients) at transplanting and then 1 g m−2 biweekly on all treatments until the end of the trial.
  • ...22 more annotations...
  • trimmed at 7 cm and irrigated two times a week to field capacity.
  • Six weeks after transplanting
  • For drought stress treatment, the amount of irrigation water was determined based on evapotranspiration (ET) loss by weighing the pots every other day and the irrigation was provided to compensate 30% to 50% ET loss. ET was determined by weighing the pots.
  • VWC was reduced from 34.6% to 27.9% between day 0 and day 7, from 27.9% to 23.4% between day 7 and day 14, from 23.4%% to 14.5% between day 14 to day 21, and from 14.5% to 5.1% between day 21 and day 28.
  • Leaf chlorophyll was extracted with acetone and measured using a spectrophotometer
  • Leaf photosynthetic rate and stomatal conductance were measured using a portable photosynthetic system
  • turf quality started to decline at day 7 due to drought stress.
  • Drought stress reduced turf quality rating by 14.8% relative to the control at the end of drought stress (28 d).
  • The electrolyte leakage increased gradually from day 7 through day 21 due to drought stress.
  • Drought stress increased electrolyte leakage by 35.6% at day 14, 95.7% at day 21, and 105.4% at day 28 when compared to the control.
  • chlorophyll began to decline after day 7 due to drought stress
  • educed chlorophyll content by 39.0% relative to the control.
  • photosynthetic rate due to drought stress was observed as early as day 7
  • Stomatal conductance decline was first observed at day 4 of drought stress
  • day 28 when drought stress reduced stomatal conductance by 84.4%
  • The ZR level declined gradually from day 14 through day 28 due to drought stress. Drought stress reduced ZR by 28.5% at day 14, 35.1% at day 21, and 59.1% at day 28 relative to the control.
  • 1 week after ZR did. At the end of drought stress (day 28), drought stress reduced iPA by 50.4% relative to the control.
  • Drought stress reduced leaf IAA by 14.3% and 26.7% at day 21 and day 28, respectively, when compared to the control.
  • The ABA started to accumulate after day 4 of drought stress and the difference between drought stress and the control was observed as early as 7 d of drought stress
  • The ABA content gradually increased from day 7 through day 28. Drought stress increased leaf ABA by 23.6% at day 7, 30.7% at day 14, 87.6% at day 21, and 108.5% at day 28 relative to the control.
  • drought stress did not impact leaf GA4 content
  • We found that ABA/CK increased sharply from day 14 through day 28 due to increase in ABA and decline in CK (ZR + iPA) during the same period. At the end of trial (day 28), drought stress induced an increase in leaf ABA/CK ratio by 3.4-fold relative to the control.
emmarrogers

Acute exposure to chlorpyrifos and glyphosate induces changes in hemolymph biochemical ... - 0 views

www.sciencedirect.com/...S153204561930095X

crayfish HSR-2025 HSR pesticide

shared by emmarrogers on 02 Oct 24 - No Cached
  • The 96 h LC50 values of glyphosate to A. leptodactylus were 7.83 ± 0.50 mg L−1
    • emmarrogers
      emmarrogers on 02 Oct 24
       
      This is the first 96hLC50 I have seen for crayfish
  • emmarrogers on 02 Oct 24
     
    "Astacus leptodactylus"
emmarrogers

Study shows crayfish exhibit anxiety-like behavior when stressed - 0 views

phys.org/...ty-like-behavior-stressed.html

crayfish HSR-2025 HSR environmental biology behavioralscience behavior

shared by emmarrogers on 26 Sep 24 - No Cached
  • Spontaneous behavior of unstressed crayfish in the aquatic dark/light plus-shaped maze
    • emmarrogers
      emmarrogers on 26 Sep 24
       
      video of crayfish in maze
emmarrogers

Acute exposure to chlorpyrifos and glyphosate induces changes in hemolymph biochemical ... - 0 views

pubmed.ncbi.nlm.nih.gov/31055068

shared by emmarrogers on 25 Sep 24 - No Cached
  • glyphosate
    • emmarrogers
      emmarrogers on 25 Sep 24
       
      this is the most common herbicide in use agriculturally, and in common use. The trade name for this herbicide is Round up, which is a very common herbicide.
  • 49.55 ± 4.66 μg L-1
  • 7.83 ± 0.50 mg L-1
emmarrogers

Effect of Chronic Exposure to Prometryne on Oxidative Stress and Antioxidant Response i... - 0 views

www.ncbi.nlm.nih.gov/...PMC3976930

crayfish pesticide HSR-2025 HSR environmental biology behavioralscience

shared by emmarrogers on 20 Sep 24 - No Cached
  • oxidative stress
    • emmarrogers
      emmarrogers on 20 Sep 24
       
      Is this the same a phycological stress, or is it a different kind of stress?
emmarrogers

Effects of Prometryn Exposure on Hepatopancreas Oxidative Stress and Intestinal Flora i... - 0 views

www.ncbi.nlm.nih.gov/...PMC10451815

crayfish pesticide HSR-2025 HSR environmental biology behavioralscience

shared by emmarrogers on 20 Sep 24 - No Cached
  • Eriocheir sinensis
    • emmarrogers
      emmarrogers on 20 Sep 24
       
      Chinese mitten crab
  • alternative to atrazine due to its low toxicity
  • In addition, due to its low toxicity to fish, prometryn can be applied directly to aquatic activities for the removal of harmful algae and weeds in aquaculture waters
  • ...3 more annotations...
  • However, there is a paucity of studies on the negative effects of prometryn on aquatic crustaceans.
  • could affect the physiological behavior of crustacean aquatic organisms
  • Previous studies have shown that the commonly used herbicides glyphosate and atrazine are capable of causing oxidative stress,
emmarrogers

Crayfish Light-Dark Maze - Maze Engineers - 0 views

maze.conductscience.com/...crayfish-light-dark-maze

crayfish pesticide HSR-2025 HSR environmental

shared by emmarrogers on 17 Sep 24 - No Cached
  • Time spent in the dark arms of the maze Time spent in the light arms of the maze
  • water quality
emmarrogers

Acute toxicity of triazine pesticides to juvenile signal crayfish (Pacifastacus leniusc... - 0 views

pubmed.ncbi.nlm.nih.gov/24362090

crayfish HSR-2025 HSR pesticide environmental

shared by emmarrogers on 13 Sep 24 - No Cached
  • The aim of this research was to evaluate the acute toxicity of atrazine, hexazinone, metribuzine, prometryne, simazine, and terbutryne
  • 96hLC50
    • emmarrogers
      emmarrogers on 17 Sep 24
       
      96 hours for the lethal concentration to kill 50 percent of the population
  • mg.l-1
    • emmarrogers
      emmarrogers on 17 Sep 24
       
      Milligrams per litre
emmarrogers

Sub-acute toxicity of the herbicide glufosinate-ammonium exposure in adult red swamp cr... - 0 views

pubmed.ncbi.nlm.nih.gov/37742863

crayfish HSR-2025 HSR potential research idea pesticide

shared by emmarrogers on 16 Sep 24 - No Cached
  • 21 days
    • emmarrogers
      emmarrogers on 16 Sep 24
       
      This is over 7 times the other studies I have seen
    • emmarrogers
      emmarrogers on 16 Sep 24
       
      they are usually 24-96 hours
emmarrogers

Effects of the herbicide metolachlor on the perception of chemical stimuli by Orconecte... - 0 views

www.journals.uchicago.edu/...1468482

crayfish HSR-2025 HSR potential research idea pesticide

shared by emmarrogers on 16 Sep 24 - No Cached
  • It is not clear if this interference comes from masking the odor, where the animal cannot detect the signal over the background noise, or if there is a physiological effect on the olfactory receptor cells or neuromusculature that influences the animal’s behavior
emmarrogers

Atrazine Exposure Affects the Ability of Crayfish (Orconectes rusticus) to Localize a F... - 0 views

link.springer.com/...s00244-015-0142-y

crayfish HSR-2025 HSR potential research idea pesticide

shared by emmarrogers on 16 Sep 24 - No Cached
  • all levels of the aquatic food web
    • emmarrogers
      emmarrogers on 16 Sep 24
       
      This is a compelling argument for the idea that crayfish are a keystone species
    • emmarrogers
      emmarrogers on 16 Sep 24
       
      look 2 rows down
  • Because crayfish are a keystone species
emmarrogers

The role of omnivorous crayfish in littoral communities | Oecologia - 0 views

link.springer.com/...s00442-004-1548-9

crayfish HSR-2025 HSR potential research idea pesticide

shared by emmarrogers on 16 Sep 24 - No Cached
  • indirectly
  • Metaphytic algae were strongly affected by crayfish presence
  • dramatic direct and indirect impacts
  • ...1 more annotation...
  • Abstract
    • emmarrogers
      emmarrogers on 16 Sep 24
       
      this entire article supports the idea that crayfish are a keystone species
emmarrogers

Environmentally relevant atrazine exposures cause DNA damage in cells of the lateral an... - 0 views

www.ncbi.nlm.nih.gov/...PMC6854318

shared by emmarrogers on 16 Sep 24 - No Cached
  • 80 ppb atrazine
  • 10 days
    • emmarrogers
      emmarrogers on 16 Sep 24
       
      This is the longest time I have seen so far. most studies are between 24-96 hours
  • banned in the European Union
    • emmarrogers
      emmarrogers on 16 Sep 24
       
      I wonder why it is banned in the EU, but not the US
    • emmarrogers
      emmarrogers on 16 Sep 24
       
      increased risk of prostate cancer and decreased sperm count in men, and a higher risk of breast cancer in women. reason why its banned
  • ...3 more annotations...
  • evapotranspiration
    • emmarrogers
      emmarrogers on 16 Sep 24
       
      Loss of water from the soil both by evaporation from the soil surface and by transpiration from the leaves of the plants growing on it.
  • ATR is the most commonly detected herbicide in the U.S. Midwestern region
  • This is a cause for concern as ATR can leach into aquatic ecosystems and affect aquatic organisms.
emmarrogers

Herbicides in Water Sources: Communicating Potential Risks to the Population of Mangaun... - 0 views

www.ncbi.nlm.nih.gov/...PMC10302186

shared by emmarrogers on 13 Sep 24 - No Cached
  • The mean concentrations of atrazine, metolachlor, simazine and terbuthylazine were 0.02 mg/L, 0.01 mg/L, 0.03 mg/L and 0.02 mg/L, respectively
  • Algae and invertebrates were also sensitive to atrazine,
  • Their corresponding average concentrations were 0.02 mg/L, 0.12 mg/L, 0.03 mg/L, and 0.01 mg/L.
  • ...1 more annotation...
  • The mean concentrations of atrazine, metolachlor, simazine, and terbuthylazine were 0.03 mg/L, 0.01 mg/L, 1.82 mg/L, and 0.06 mg/L
emmarrogers

Herbicide concentrations in the Mississippi River Basin-the importance of chloroacetani... - 0 views

www.sciencedirect.com/...S0048969703005084

crayfish HSR-2025 HSR environmental pesticide

shared by emmarrogers on 12 Sep 24 - No Cached
  • eethylatrazine
  • deisopropylatrazine
  • atrazine
    • emmarrogers
      emmarrogers on 12 Sep 24
       
      Atrazine is one of the main pesticides used in Agriculture
  • ...2 more annotations...
  • DEA was detected in 61%, and DIA was detected in 42% of water samples collected from the Mississippi River at Baton Rouge
  • In 1991, alachlor ESA concentrations ranged from 0.2 to 0.9 μg/l, whereas alachlor concentrations ranged from 0.05 to 0.1 μg/l for multiple samples collected from the mouth to the headwaters of the Mississippi River
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