Seasonal changes in water relations and gas exchange in leaves of two Tunisian olive (Olea europaea L.) cultivars under water deficit.

Book Title: NA
Year Published: 2007
Month Published: NA
Author: Guerfel, M. ; Baccouri, B. ; Boujnah, D. ; Zarrouk, M.
Book Group Author: NA
Abstract:

Water relation parameters, leaf CO2 assimilation rates, stomatal conductance (gs), internal CO2 concentrations (Ci), and stomatal density were studied in two major Tunisian olive cultivars, 'Chemlali' and 'Chetoui', under rain-fed, or rain-fed plus a moderate level of supplemental irrigation, conditions. Measurements were carried out throughout the season from January-September 2005, on 1-year-old leaves. CO2 assimilation rates showed substantial seasonal variation, but were similar in the two cultivars, with higher values during the Spring and lower values during the Summer. Stomatal conductance (gs) followed a similar trend to leaf CO2 assimilation rates, with an increase in March, followed by a decrease during August. 'Chetoui' had the highest leaf CO2 assimilation rate and gs value (24.26 µmol m-2 s-1 and 0.35 mol m-2 s-1, respectively); but, compared to the supplemental irrigation treatment, 'Chemlali' had a higher resistance to drought stress than 'Chetoui'.

Pages: 721 - 726
URL: http://0-search.ebscohost.com.catalog.library.colostate.edu/login.aspx?direct=true&AuthType=cookie,ip,url,cpid&custid=s4640792&db=lah&AN=20073245067&site=ehost-live
Volume: 82
Number: 5
Journal: Journal of Horticultural Science and Biotechnology
Journal ISO: NA
Organization: NA
Publisher: NA
ISBN: NA
ISSN: 1462-0316
DOI: NA
Keywords:

assimilation, carbon dioxide, cultivars, drought, droughtresistance, gas exchange, genetic diversity, genetic variation,irrigation, leaves, net assimilation rate, olives, plant waterrelations, stomata, Tunisia, Olea europaea, Olea, Oleaceae,Scrophulariales, dicotyledons, angiosperms, Spermatophyta, plants,eukaryotes, Maghreb, North Africa, Africa, Mediterranean Region,Developing Countries, Threshold Countries, Francophone Africa,cultivated varieties, drought tolerance, genetic variability, genotypicvariability, genotypic variation, NAR, Oleales, watering, HorticulturalCrops (FF003) (New March 2000), Plant Water Relations (FF062), PlantProduction (FF100), Environmental Tolerance of Plants (FF900), SoilWater Management (Irrigation and Drainage) (JJ800) (Revised June 2002)[formerly Soil Water Management]

Source: EBSCO
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