Publications by authors named "Maria Igal"
Chlorsulfuron and imazethapyr (herbicides that inhibit acetolactate synthase; ALS, EC 4.1.3.
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- Herbicides like imazethapyr (IM) induce aerobic fermentation in plants by inhibiting the synthesis of branched chain amino acids, but the specific role of fermentation in their effectiveness is unclear.
- A study comparing IM's effects on pea plants with hypoxia and pyruvate feeding showed that IM treatment caused internal anoxia and quicker fermentation initiation without immediately reducing energy levels.
- The metabolic profiling revealed that IM complicates carbon and nitrogen metabolism, leading to a build-up of carbohydrates and glycolytic intermediates, which is associated with growth arrest in the plants.
Background: The herbicide glyphosate inhibits the biosynthesis of aromatic amino acids by blocking the shikimate pathway. Imazethapyr and chlorsulfuron are two herbicides that act by inhibiting branched-chain amino acid biosynthesis. These herbicides stimulate secondary metabolism derived from the aromatic amino acids.
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- Plants can experience internal oxygen levels that are significantly lower than the surrounding environment, even when conditions are optimal for growth.
- Research on pea roots reveals that they have adaptive respiration mechanisms that conserve oxygen during hypoxic conditions, indicating that there’s a regulatory system at play rather than just oxygen being a limiting factor.
- The study shows that fermentation processes in plants, particularly alcohol fermentation, are crucial for regulating pyruvate levels and that these processes are more influenced by the plant's energy status than by low oxygen levels.
The pattern of nitrogen assimilation in soybean plants treated with a herbicide that inhibits branched-chain amino acid biosynthesis was evaluated by (15)N isotopic analysis. The herbicide imazethapyr caused a strong decrease in nitrate uptake by roots, partly due to a reduced stomatal conductance. The inhibition of (15)N uptake was accompanied by a decrease in the (15)N content in the plant and, concomitantly, an inhibition of translocation to the shoot.
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