A IMPORTÂNCIA DO MICRONUTRIENTE FERRO PARA AS PLANTAS: UMA BREVE REVISÃO
A IMPORTÂNCIA DO MICRONUTRIENTE FERRO PARA AS PLANTAS: UMA BREVE REVISÃO
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DOI: https://doi.org/10.22533/at.ed.8962403101
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Palavras-chave: Nutrição Mineral; Transporte; Metabolismo; Fisiologia Vegetal
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Keywords: Mineral Nutrition; Transport; Metabolism; Plant Physiology
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Abstract: Iron (Fe) is an essential micronutrient for plants, playing a crucial role in vital metabolic processes such as photosynthesis, cellular respiration, and the biosynthesis of chlorophyll, hemeproteins, and iron-sulfur (Fe-S) proteins. Plants utilize two main strategies to absorb Fe: Strategy I, common in eudicots and non-graminaceous monocots, involves rhizosphere acidification and the reduction of Fe3+ to Fe2+; and Strategy II, predominant in grasses, which involves the release of phytosiderophores to chelate Fe3+. The transport of Fe within the plant is facilitated by chelating molecules such as citrate and nicotianamine and involves various specific transporters. Accumulated Fe is primarily stored in chloroplasts and mitochondria, where it plays a fundamental role in photosynthesis and respiration. Additionally, Fe is stored in phytoferritins, hollow proteins with strong ferroxidase activity that are important for maintaining Fe homeostasis in the plant. Fe deficiency leads to symptoms such as interveinal chlorosis, with whitening in more severe cases, and reduced photosynthetic rates. On the other hand, Fe toxicity results in a condition known as bronzing, which is particularly problematic in waterlogged soils, affecting crop yields.
- Felipe Valadares Ribeiro Avelar
- Fábio Luiz de Oliveira
- José Francisco Teixeira do Amaral
- Marcelo Antonio Tomaz