The photooxidation of glyoxylate by envelope-free spinach chloroplasts and its relation to photorespiration
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Unravelling mesosulfuron-methyl phytotoxicity and metabolism-based herbicide resistance in Alopecurus aequalis: Insight into regulatory mechanisms using proteomics
2019, Science of the Total EnvironmentCitation Excerpt :Considering also the mesosulfuron-induced up-regulation of serine hydroxylmethyltransferase (Shmt), serine-glyoxylate aminotransferase (SGAMT), glycine dehydrogenase (GLDC), and aminotransferase (AMT) in R_T vs. S_T (Fig. 5), we hypothesize that photosynthetic energy was quickly diverted into the photorespiration pathway in R plants under mesosulfuron stress (Kisaki and Tolbert, 1970). During photorespiration, glycolate is first oxidized by glutathione disulfide (GLO) to glyoxylate, which may be further metabolized in plant tissues by the glycolate pathway; intermediates in this sequence are glycine, serine, hydroxypyruvate, and glycerate (Fig. 5) (Zelitch, 1972). Photorespiration in green tissues is now appreciated as a key part of plant stress responses to mitigate ROS and glycolate accumulation, and dissipate excess reducing equivalents and energy of ATP and NAD(P)H, and may provide an internal CO2 pool for the Calvin cycle (Voss et al., 2013).
A possible role for the chloroplast pyruvate dehydrogenase complex in plant glycolate and glyoxylate metabolism
2013, PhytochemistryCitation Excerpt :However, there is also evidence that chloroplasts contain a pathway that oxidizes glycolate to glyoxylate and further to CO2 (Frederick et al., 1973; Kebeish et al., 2007). When glyoxylate is fed to isolated chloroplasts, CO2 release from this compound can be observed (Zelitch, 1972). Enzymes catalyzing the reaction steps of this pathway have not been identified so far.
Metabolism of Activated Oxygen in Peroxisomes from two Pisum sativum L. Cultivars with Different Sensitivity to Sodium Chloride
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