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How does Atrazine reduce the rate of photosynthesis in weeds?

Mechanism of Action: Paraquat is a post-emergence herbicide with contact foliar activity. It is rapidly absorbed by green tissue and inhibits photosynthesis. The specific site of action is different from that of atrazine, and the results are a much more rapid onset of leaf death. Regardless, paraquat causes the formation of radical oxygen, which is toxic to plant cell membranes, within the chloroplast.

In susceptible plant species, atrazine inhibits photosynthesis

Numerous forms of flora and fauna are negatively impacted When aquatic ecosystems are polluted it impacts the entire community structure This can lead to:
Unhealthy Food Web
Population declines
Trophic Cascades
Potential for Biomagnification and Bioaccumulation Effects on Flora and Fauna Invertebrates - Primary Producers Invertebrates - Primary Consumers Macrophytes (Flora) Amphibians - Secondary Consumers Fish - Secondary/Tertiary Consumers Birds - Tertiary/Quaternary Consumers Alligators - Quaternary Consumers Macrophytes Aquatic Plant Provides shelter and food source for fauna Photosynthesis inhibited by Atrazine Loss of macrophytes have negative indirect effects on fauna Can be a factor in limiting atrazine exposure in aquatic ecosystems (Davis et al.(2012) Invertebrates - Primary Producers Includes phytoplankton Well known to help sustain aquatic ecosystems Phytoplankton is autotrophic and relies on photosynthesis Atrazine inhibits photosynthesis Harmful effects also include reductions in biomass, and indirect effects on aquatic food web Invertebrates - Primary Consumers Koprivnikar and Walker's (2011) study Focused on the parasitic relationship between gastropods and trematodes Atrazine works synergistically with parasitic threats to reduce overall health and fitness levels in gastropods Atrazine increases susceptibility of second intermidiate hosts to trematode infection Amphibians - Secondary Consumers Storrs and Kiesecker's (2004) study
Included lab research
Focused on survivorship
Frogs exposed to lower concentrations of atrazine died sooner
Higher concentrations do damage too Hayes et al.'s (2003) study
Included lab and field research
Atrazine chemically castrates male frogs
Atrazine exposure resulted in abnormal organ development, reduced germ cells, and hermaphroditism
Male frogs can provide viable clutches Fish - Seconday/Tertiary Consumers Hussein et al.'s (1996) study Focused on spiny catfish and tilapia found in the Nile River Exposure results more pronounced in spiny catfish Atrazine exposure resulted in rapid respiration, reduced feeding activity, and slower reflexes/swimming movement Additional blood testing showed toxic effects on the spleen, liver, and anterior kidney.

Effect of atrazine on photosynthesis

the action of the herbicide atrazine to the inhibition of photosynthesis.

2003) Used to inhibit photosynthesis and overall plant growth in weeds Application results in the persistence of atrazine and its metabolites for decades (Jablonowski et al.

Effects of atrazine on photosynthesis and defense …

Atrazine is an inhibitor of photosynthesis by blocking the electron transport due to binding of the Qb protein in the thylakoid mem-brane.

View This Abstract Online; The impact of the herbicide atrazine on growth and photosynthesis of seagrass, Zostera marina (L.), seedlings. Mar Pollut Bull.
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