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Título

Effects of iron chlorosis and iron resupply on leaf xylem architecture, water relations, gas exchange and stomatal performance of field-grown peach (Prunus persica (L.) Batsch.)

AutorEichert, Thomas; Peguero Pina, José Javier; Gil-Pelegrín, Eustaquio; Heredia, Antonio; Fernández, Victoria
Fecha de publicaciónene-2010
EditorJohn Wiley & Sons
CitaciónEichert T, Peguero-Pina JJ, Gil-Pelegrín E, Heredia A, Fernández V. Effects of iron chlorosis and iron resupply on leaf xylem architecture, water relations, gas exchange and stomatal performance of field-grown peach (Prunus persica (L.) Batsch.). Physiologia Plantarum 138 (1): 48-59 (2010)
ResumenThere is increasing evidence suggesting that iron (Fe) deficiency induces not only leaf chlorosis and a decline of photosynthesis, but also structural changes in leaf morphology, which might affect the functionality of leaves. In this study we investigated the effects of Fe deficiency on the water relations of peach (Prunus persica (L.) Batsch.) leaves and the responses of previously chlorotic leaves to Fe resupply via the root or the leaf. Iron deficiency induced a decline of maximum potential PSII efficiency (FV/FM), of rates of net photosynthesis and transpiration and of water use efficiency. Iron chlorosis was associated with a reduction of leaf xylem vessel size and of leaf hydraulic conductance. In the course of the day, water potentials in chlorotic leaves remained higher (less negative) than in green leaves. In chlorotic leaves, normal stomatal functioning was disturbed, as evidenced by the lack of opening upon withdrawal of external CO2 and stomatal closure after sudden illumination of previously darkened leaves. We conclude that the Fe deficiency-induced limitations of xylem conductivity elicited a water saving strategy, which poses an additional challenge to plant growth on high pH, calcareous soils. Fertilisation with Fe improved photosynthetic performance but the proper xylem structure and water relations of leaves were not fully restored, indicating that Fe must be available at the first stages of leaf growth and development.
DescripciónThe definitive version is available at: http://www3.interscience.wiley.com/journal/118510326/home
Versión del editorhttp://www3.interscience.wiley.com/cgi-bin/fulltext/122602429/PDFSTART
URIhttp://hdl.handle.net/10261/17336
DOI10.1111/j.1399-3054.2009.01295.x
ISSN0031-9317 (Print)
1399-3054 (Online)
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