Leaf Water Relations in Lime Trees Grown under Shade Netting and Open-Air

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ID: 112683
2020
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Abstract
Physiological plant water status indicators are useful for managing precision irrigation in regions with limited water resources. The aim of this work was to evaluate the effect of shade netting on the diurnal and seasonal variations of several plant water status indicators in young lime trees (Citrus latifolia Tan., cv. Bearss), grown at the CEBAS-CSIC experimental station in Murcia, Spain. Stem water potential (Ψstem), leaf gas exchange (net photosynthesis (Pn) and stomatal conductance (gs)), and canopy temperature (Tc) were measured on representative days of winter and summer. The Ψstem daily pattern was quite similar in both seasons under both conditions. However, the circadian rhythm of leaf gas exchange was affected by shade conditions, especially in summer, when shaded leaves showed maximum gs values for a longer time, allowing higher net photosynthesis (37%). Canopy temperature behaved similarly in both conditions, nevertheless, lower values were recorded in open-air than in shaded trees in the two seasons. The canopy-to-air temperature difference (Tc − Ta), however, was lower in shaded trees during the daylight hours, indicating the higher degree of leaf cooling that was facilitated by high gs values. The possibility of continuously recording Tc makes it (or the proposed canopy thermal index, CTI) a promising index for precise irrigation scheduling. Shade netting was seen to favour gas exchange, suggesting that it may be considered alternative to open-air for use in semi-arid areas threatened by climate change.
Reference Key
mira-garcía2020plantsleaf Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Ana Belén Mira-García;Wenceslao Conejero;Juan Vera;María Carmen Ruiz-Sánchez;Mira-García, Ana Belén;Conejero, Wenceslao;Vera, Juan;Ruiz-Sánchez, María Carmen;
Journal plants
Year 2020
DOI
10.3390/plants9040510
URL
https://www.mdpi.com/2223-7747/9/4/510#citedby
Keywords
canopy temperature drip irrigation leaf water relations lime trees net house thermal canopy index

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