Effects of Glyphonosate on Ultrastructure and Photosynthesis of Pellia epiphylla

Pihakaski, S.; Pihakaski, Kaarina

doi:10.1093/oxfordjournals.aob.a085902

Cited by 21 publications

(14 citation statements)

References 12 publications

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“…3) coincided with a decrease in stomatal conductance (Table II). This pattern is in accord with previous studies that found that the major effects on photosynthesis result from mechanisms other than a direct effect on carbon pathways (4,11,13,16,18). Shaner and Lyon (16) (Fig.…”

Section: Resultssupporting

confidence: 92%

Glyphosate Inhibits Photosynthesis and Allocation of Carbon to Starch in Sugar Beet Leaves

Geiger¹,

Kapitan²,

Tucci³

1986

Plant Physiol.

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Application of glyphosate (N-Iphosphonomethyll glycine) to exporting leaves of sugar beet (Beta vulgaris, L.) during the day lowered stomatal conductance and carbon fixation. Allocation of newly fixed carbon to foliar starch accumulation was nearly completely inhibited, being decreased by the same amount as net carbon fixation. In contrast, decreasing net carbon fixation in untreated leaves by lowering CO2 concentration caused starch accumulation to decrease, but only in the same proportion as net carbon fixation. Shikimate level increased 50-fold in treated leaves but the elevated rate of carbon accumulation in shikimate was only 4% of the decrease in the rate of starch accumulation. Application of steady state labeling with 14C02 to exporting leaves confirmed the above changes in carbon metabolism, but revealed no other major daytime differences in the 14C-content of amino acids or other compounds between treated and control leaves. Less 14C accumulated in treated leaves because of decreased fixation, not increased export. The present study was conducted to determine the action of glyphosate on allocation of newly fixed carbon in source leaves and on NCE2 during the first 24 h after application.

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Section: Resultssupporting

confidence: 92%

Glyphosate Inhibits Photosynthesis and Allocation of Carbon to Starch in Sugar Beet Leaves

Geiger¹,

Kapitan²,

Tucci³

1986

Plant Physiol.

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“…1a); however the A for RR2 was higher than RR1, therefore suggesting higher photosynthetic activity. Zobiole et al (2010a) reported that A, gs and E were reduced by glyphosate, possibly due to direct damage by glyphosate to chloroplasts (Campbell et al 1976;Pihakaski and Pihakaski 1980;Nilsson 1985) or immobilization of Mg and Mn required for chlorophyll formation and photosynthesis. Since glyphosate is a glyphosate a strong metal chelator (Jaworski 1972;Kabachnik et al 1974;Coutinho and Mazo 2005), it may immobilize essential micronutrients required as components, co-factors or regula- (Johal and Huber 2009).…”

Section: Discussionmentioning

confidence: 99%

“…3a). This decrease could be due to direct damage of the chloroplast (Campbell et al 1976;Pihakaski and Pihakaski 1980;Nilsson 1985) in the presence of glyphosate. Zobiole et al (2010a) also noted that RR soybean from different maturity groups exposed to a single or sequential application of glyphosate frequently had chlorophyll concentrations lower than plants that were not exposed to the herbicide.…”

Section: Discussionmentioning

confidence: 99%

“…A previous study demonstrated that glyphosate reduced shoot concentrations of mineral nutrients in RR soybean as compared to nontreated RR soybean or their near-isogenic nontreated non-RR with the effect being most pronounced in the early maturity group cultivars (Zobiole et al 2010a). The effect on decreased shoot mineral concentration could be attributed to reductions in photosynthetic parameters as a result of direct damage of glyphosate to chlorophyll (Pihakaski and Pihakaski 1980;Kitchen et al 1981;Reddy et al 2004) or immobilization of essential micronutrients by glyphosate, due to the ability of glyphosate to form insoluble glyphosatemetal complexes (Jaworski 1972;Kabachnik et al 1974;Bromilow et al 1993;Coutinho and Mazo 2005).…”

Section: Introductionmentioning

confidence: 99%

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Glyphosate affects photosynthesis in first and second generation of glyphosate-resistant soybeans

et al. 2010

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The crop area planted to conventional soybeans has decreased annually while that planted to glyphosate-resistant (RR) soybean has drastically increased mainly due to the wide adoption of glyphosate in current weed management systems. With the extensive use of glyphosate, many farmers have noted visual plant injury in RR soybean varieties after glyphosate application. A new generation designated as "second generation-RR2" has been recently developed and these RR2 cultivars already are commercially available for farmers and promoted as higher yielding relative to the previous RR cultivars. However, little information is currently available about the performance of RR2 soybean beyond commercial and farmer testimonial data. Thus, an evaluation of different glyphosate rates applied in different growth stages of the first and second generation of RR soybeans, revealed a significant decrease in photosynthesis. In general, increased glyphosate rate and late applications (V6) pronounced decrease photosynthetic parameters and consequently decreased in leaf area and shoot biomass production. In contrast, low rate and early applications were less damage for the RR soybean plants, suggesting that with early applications (V2), plants probably have more time to recover from glyphosate or its metabolites effects regarding late applications.

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“…It has been noticed that feeding of aromatic amino acids does not always reverse growth inhibi tion caused by glyphosate [13]. This may be due to other disturbances caused by glyphosate [14].…”

Section: Effects O F Glyphosate On Growth and Cinnamoyl Putrescine Acmentioning

confidence: 99%

Effects of Glyphosate on Shikimic Acid Accumulation in Tobacco Cell Cultures with Low and High Yields of Cinnamoyl Putrescines

Berlin

Witte

1981

Zeitschrift Für Naturforschung C

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To study the flow of carbon through the shikimate pathway in tobacco cell cultures with low and high yields o f cinnamoyl putrescines, the cell cultures were treated with glyphosate. In the presence o f glyphosate the levels o f free shikimic acid were increased more than 300-fold by both cell lines. Despite of a normally 10-fold higher level o f cinnamoyl putrescines, the high yielding cell line accumulated only 25% more free shikimic acid than the low yielding cell line. This result together with earlier observations indicated that the increased formation o f cinnamoyl putrescines was rather limited by the activity o f phenylalanine ammonia lyase than by increased substrate supply caused by alterations in the shikimate pathway.

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Effects of Glyphonosate on Ultrastructure and Photosynthesis of Pellia epiphylla

Cited by 21 publications

References 12 publications

Glyphosate Inhibits Photosynthesis and Allocation of Carbon to Starch in Sugar Beet Leaves

Glyphosate Inhibits Photosynthesis and Allocation of Carbon to Starch in Sugar Beet Leaves

Glyphosate affects photosynthesis in first and second generation of glyphosate-resistant soybeans

Effects of Glyphosate on Shikimic Acid Accumulation in Tobacco Cell Cultures with Low and High Yields of Cinnamoyl Putrescines

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