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dc.rights.licensehttp://creativecommons.org/licenses/by-nc-sa/3.0/ve/
dc.contributor.authorJaimez, Ramón
dc.contributor.authorRada R., Fermin J.
dc.contributor.authorGarcía Nuñez, Carlos
dc.contributor.authorAzócar, Aura
dc.date.accessioned2014-11-03T18:25:45Z
dc.date.available2014-11-03T18:25:45Z
dc.date.issued2005
dc.identifier.urihttp://www.saber.ula.ve/handle/123456789/39242
dc.descriptionPublicado en: Scientia Horticulture 104, 2005. Pp 79-89es_VE
dc.description.abstractThe seasonal effect of soil water availability on leaf gas exchange of plantain plants cv. Hartón growing on two different texture soils (loamy and clayey) were evaluated. Soil water deficits corresponded to 48, 24 and 4 days without precipitation. Daily measurements of leaf gas exchange and microclimatic conditions were carried out at 2 h intervals in a humid tropical environment south of Maracaibo Lake, Venezuela. The results show that cv. Hartón is sensitive to conditions of low water deficit on loamy and to a much greater degree on clayey soils. A marked reduction in leaf conductance (gs) was observed under severe as well as moderate deficit (below 50 mmol m-2 s-1) on clayey soils. Under low deficit gs increases to values between 60 and 100 mmol m-2 s-1. The same trend was observed in plants on loamy soils but higher gs for all conditions were obtained compared with plants on clayey soil. Stomatal closure produced a reduction of 85 and 55% of total assimilation (Atot) for severe and moderate deficit in plants on clayey soils, respectively. While plants on loamy soil exhibited a 65 and 35% reduction, respectively. Water use efficiency (WUE) consistently decreased as available soil water decreased on both soil types. Independently of soil water conditions, higher WUE were always obtained for loamy soils. This suggests that cv. Hartón does not have the ability to adjust the CO2 assimilation to transpiration ratio in order to optimize gas exchange. This evidences the importance of maintaining high conditions of available soil water in order to avoid lower assimilation rates that probably influence negatively on yield and fruit quality.
dc.language.isoeses_VE
dc.rightsinfo:eu-repo/semantics/openAccess
dc.titleSeasonal variations in leaf gas exchange of platain cv. Hartón (Musa AAB) under different soil water conditions in a himid tropical regiones_VE
dc.typeinfo:eu-repo/semantics/article
dc.description.colacion79-89es_VE
dc.description.emailraysus@cantv.netes_VE
dc.description.emailfrada@ula.ve
dc.description.emailaazocar@ula.ve
dc.description.emailcgarcia@ula.ve
dc.subject.departamentoDepartamento de Biologíaes_VE
dc.subject.facultadFacultad de Cienciases_VE
dc.subject.keywordsWater deficit
dc.subject.keywordsMusa
dc.subject.keywordsWater use efficiency
dc.subject.keywordsPhotosynthesis
dc.subject.thematiccategoryBiologíaes_VE
dc.subject.tipoArtículoses_VE
dc.subject.unidadinvInstituto de Ciencias Ambientales y Ecológicas (ICAE)es_VE
dc.type.mediaTextoes_VE


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