Environmental effect on ABA concentration and water potential in olive leaves (Olea europaea L. cv ""Koroneiki"") under non-irrigated field conditions

dc.contributor.author	Kitsaki, CK	en
dc.contributor.author	Drossopoulos, JB	en
dc.date.accessioned	2014-06-06T06:46:31Z
dc.date.available	2014-06-06T06:46:31Z
dc.date.issued	2005	en
dc.identifier.issn	00988472	en
dc.identifier.uri	http://dx.doi.org/10.1016/j.envexpbot.2004.06.002	en
dc.identifier.uri	http://62.217.125.90/xmlui/handle/123456789/3049
dc.subject	Abscisic acid	en
dc.subject	Air temperature	en
dc.subject	Leaf	en
dc.subject	Leaf water potential	en
dc.subject	Olive	en
dc.subject	Rainfall	en
dc.subject	Relative humidity	en
dc.subject	Soil temperature	en
dc.subject	Solar radiation	en
dc.subject	Wind velocity	en
dc.subject.other	abscisic acid	en
dc.subject.other	environmental stress	en
dc.subject.other	relative humidity	en
dc.subject.other	soil temperature	en
dc.subject.other	water stress	en
dc.subject.other	wind velocity	en
dc.subject.other	Athens [Attica]	en
dc.subject.other	Attica	en
dc.subject.other	Eastern Hemisphere	en
dc.subject.other	Eurasia	en
dc.subject.other	Europe	en
dc.subject.other	Greece	en
dc.subject.other	Southern Europe	en
dc.subject.other	World	en
dc.subject.other	Olea europaea	en
dc.title	Environmental effect on ABA concentration and water potential in olive leaves (Olea europaea L. cv ""Koroneiki"") under non-irrigated field conditions	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.envexpbot.2004.06.002	en
heal.publicationDate	2005	en
heal.abstract	How does the olive tree respond to environmental stress in the Mediterranean climate under non-irrigated field conditions with respect to leaf abscisic acid (ABA) concentrations and water status? To answer this question we determined simultaneously ABA concentration and water potential (Ψl) in olive leaves (Olea europaea L. cv ""Koroneiki"") during three successive years and related them to environmental parameters. The experiment was carried out in the orchard of the Agricultural University of Athens (Greece). The environmental parameters we followed were: (i) soil temperature (soil T) at a depth of 20 cm at 08:00 h on the sampling day; (ii) air temperatures, i.e. maximum (Max air T) and minimum (Min air T) on the previous day; (iii) relative atmospheric humidity at 08:00 h on the sampling day (RH (08:00)) and at 14:00 h on the previous day (RH (14:00)); (iv) weekly rainfall; (v) wind velocity on the previous day and (vi) solar radiation on the previous day. Similar patterns of change of ABA levels and Ψl, as well as environmental parameters were observed during both the non-bearing (NBC) and the bearing (BC) growth cycles. Low leaf ABA content was detected during autumn and spring periods. The olive tree tended to acclimatize to prolonged hot-dry periods by reducing the level of ABA at the end of summer, in spite of the low Ψl. During winter, leaf ABA content remained low, while Ψl values were at their highest level. Old leaves were found to sustain lower Ψl values than young ones, especially during the hot period. Regression analysis revealed statistically significant correlation between leaf ABA and Ψl, as well as between environmental parameters and ABA or Ψl at P < 0.05 or at P < 0.01 (except for wind velocity). Concerning ABA content, our results revealed young olive leaves (NBC) to be more sensitive to most environmental parameters than old ones (BC). Water status of leaves was affected more strongly by most environmental parameters during the bearing than the non-bearing growth cycle. Temperatures affected Ψl more directly than leaf ABA content. © 2004 Elsevier B.V. All rights reserved.	en
heal.journalName	Environmental and Experimental Botany	en
dc.identifier.issue	1	en
dc.identifier.volume	54	en
dc.identifier.doi	10.1016/j.envexpbot.2004.06.002	en
dc.identifier.spage	77	en
dc.identifier.epage	89	en