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Jujube fruit water relations at fruit maturation in response to water deficits

AuthorsGalindo Egea, A. CSIC ORCID; Cruz, Z. N.; Rodríguez Hernández, Pedro; Collado González, Jacinta CSIC ORCID CVN; Corell González, M.; Memmi, H.; Moreno Lucas, Félix CSIC ORCID; Moriana, Alfonso; Torrecillas Melendreras, Arturo CSIC ORCID; Pérez-López, D.
KeywordsDeficit irrigation
Gas exchange
Plant water relations
Zizyphus jujubaa
Issue Date31-Jan-2016
CitationAgricultural Water Management 164(1): 110–117 (2016)
AbstractThe fruit maturation stage is considered the optimal phenological stage for implementing water deficitin jujube (Zizyphus jujuba Mill.), since a low, moderate or severe water deficit at this time has no effect onyield, fruit volume or eating quality. However, no information exists at fruit water relations level on themechanisms developed by Z. jujuba to confront drought. The purpose of the present study was to increaseour understanding of the relationship between leaf and fruit water relations of jujube plants under dif-ferent irrigation conditions during fruit maturation, paying special attention to analysing whether fruitsize depends on fruit turgor. For this, adult jujube trees (cv. Grande de Albatera) were subjected to fiveirrigation treatments. Control plants (T0) were irrigated daily above their crop water requirements inorder to attain non-limiting soil water conditions in 2012 and 2013. T1 plants were subjected to deficitirrigation throughout the 2012 season, according to the criteria frequently used by the growers in thearea. T2 (2012), T3 and T4 (2013) were irrigated as T0 except during fruit maturation, in which irrigationwas withheld for 32, 17 and 24 days, respectively. The results indicated that the jujube fruit maturationperiod was clearly sensitive to water deficit. During most of this stage water could enter the fruits viathe phloem rather than via the xylem. From the beginning of water withholding to when maximumwater stress levels were achieved, fruit and leaf turgor were maintained in plants under water deficit.However, a direct relation between turgor and fruit size was not found in jujube fruits, which could bedue to an enhancement of a cell elasticity mechanism (elastic adjustment) which maintains fruit turgorby reducing fruit cells size or to the fact that jujube fruit growth depends on the fruit growth-effectiveturgor rather than just turgor pressure.
Description8 páginas.-- 6 figuras.-- 1 tabla.-- 44 referencias
Publisher version (URL)http://dx.doi.org/10.1016/j.agwat.2015.08.024
Appears in Collections:(CEBAS) Artículos
(IRNAS) Artículos
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