ISSN:
1399-3054
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Biology
Notes:
Stomatal response, chlorophyll and carotenoid content, and photosynthetic electron transport were investigated in Medicago sativa L. (cv. Aragón) and Trifolium pratense L. (cv. Violeta) after plants were exposed to various glyphosate [N-(phophonomethyl)glycine] concentrations. The herbicide decreased the content of photosynthetic pigments when applied at concentrations of 0.15, 1.5 and 15 mM, showing a greater effect on chlorophyll pigments than on carotenoids. The chlorophyll a/b ratio increased as a consequence of a major effect on chlorophyll b. Glyphosate treatment (15 mM) led to a closure of stomates after seven days in both species. The results suggest that glyphosate acts as an electron transport inhibitor, because glyphosate pre-incubated chloroplasts, isolated from control plants, showed reduced photosystem II and photosystem I activities. In general, clover was more sensitive to glyphosate than glyphosate, lucerne.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1399-3054.1986.tb01234.x
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