Romera Francisco J, Alcántara Esteban
Dpto Agronomía, Escuela Técnica Superior de Ingenieros Agrónomos y Montes, Universidad de Córdoba, Avda Menéndez Pidal s / n, Apdo 3048, 14080-Córdoba, Spain. Corresponding author; email:
Dpto Agronomía, Escuela Técnica Superior de Ingenieros Agrónomos y Montes, Universidad de Córdoba, Avda Menéndez Pidal s / n, Apdo 3048, 14080-Córdoba, Spain.
Funct Plant Biol. 2004 May;31(4):315-328. doi: 10.1071/FP03165.
Plants have developed different mechanisms for the acquisition of iron (Fe). Depending on the mechanisms, plants are classified into two groups: Strategy I and Strategy II. Strategy I plants include all higher plants except the Gramineae, while Strategy II plants comprise the Gramineae. When plants suffer from Fe-deficiency, they develop several morphological and physiological changes in their roots, known as Fe-deficiency stress responses, which disappear when the plants acquire enough Fe. In Strategy I plants, these changes include subapical swelling with abundant root hairs, transfer cells, acidification of the rhizosphere, enhancement of the capacity to reduce Fe to Fe, enhancement of the capacity for Fe uptake, release of flavins, and others. The regulation of these responses is not fully understood but in recent years there has been evidence suggesting the involvement of ethylene in this process. This review summarises different results that support a role for this hormone in the regulation of Fe-deficiency stress responses by Strategy I plants.
植物已经进化出不同的铁（Fe）获取机制。根据这些机制，植物可分为两类：策略I植物和策略II植物。策略I植物包括除禾本科植物外的所有高等植物，而策略II植物则包括禾本科植物。当植物遭受缺铁胁迫时，它们的根会发生一些形态和生理变化，即缺铁胁迫反应，当植物获得足够的铁时这些反应就会消失。在策略I植物中，这些变化包括根尖下肿胀并伴有大量根毛、传递细胞、根际酸化、将Fe还原为Fe²⁺的能力增强、铁吸收能力增强、黄素释放等。这些反应的调控机制尚未完全明确，但近年来有证据表明乙烯参与了这一过程。本综述总结了不同的研究结果，这些结果支持了这种激素在策略I植物缺铁胁迫反应调控中发挥作用。
