title: Co-regulation of water and K(+) transport in sunflower plants during water stress recovery.
abstract: 16-day-old sunflower (Helianthus annuus L.) plants were subjected to deficit irrigation for 12 days. Following this period, plants were rehydrated for 2 days to study plant responses to post-stress recovery. The moderate water stress treatment applied reduced growth in all plant organs and the accumulation of K(+) in the shoot. After the rehydration period, the stem recovered its growth and reached a similar length to the control, an effect which was not observed in either root or leaves. Moreover, plant rehydration after water stress favored the accumulation of K(+) in the apical zone of the stem and expanding leaves. In the roots of plants under water stress, watering to field capacity, once the plants were de- topped, rapidly favored K(+) and water transport in the excised roots. This quick and short-lived response was not observed in roots of plants recovered from water stress for 2 days. These results suggest that the recovery of plant growth after water stress is related to coordinated water and K(+) transport from the root to the apical zone of the ​​stem and expanding leaves. This stimulation of K(+) transport in the root and its accumulation in the cells of the growing zones of the ​​stem must be one of the first responses induced in the plant during water stress recovery.
authors.affiliation: Departamento de Agronomía, Escuela Técnica Superior de Ingeniería Agronómica y de Montes, Universidad de Córdoba, Campus de Excelencia Internacional Agroalimentario, ceiA3, Ctra. Madrid-Cádiz, Km. 396, E-14071 Córdoba, Spain.
authors.forename: Manuel
authors.initials: M
authors.lastname: Benlloch
authors.affiliation: Departamento de Agronomía, Escuela Técnica Superior de Ingeniería Agronómica y de Montes, Universidad de Córdoba, Campus de Excelencia Internacional Agroalimentario, ceiA3, Ctra. Madrid-Cádiz, Km. 396, E-14071 Córdoba, Spain. Electronic address: g72begom@uco.es.
authors.forename: María
authors.initials: M
authors.lastname: Benlloch-González
mesh_terms: D001692:Biological Transport; D003890:Desiccation; D006368:Helianthus / Q000254:growth & development / Q000378:metabolism*; D018515:Plant Leaves / Q000254:growth & development / Q000378:metabolism; D018517:Plant Roots / Q000254:growth & development / Q000378:metabolism; D018520:Plant Shoots / Q000254:growth & development / Q000378:metabolism; D011188:Potassium / Q000378:metabolism*; D014867:Water / Q000378:metabolism*
chemical_list: D014867:Water; D011188:Potassium
keywords: Cell turgor; Deficit irrigation; K(+) and water transport; Plant growth; Water-stress recovery