Open AccessGrowth and Gas Exchange Responses of Olive Tree Cuttings to Elevated CO2 Concentration under Saline Conditions
Author(s) -
Juan Carlos Melgar,
Jill Dunlop,
James P. Syvertsen,
Francisco Garcı́a-Sánchez
Publication year - 2004
Publication title -
hortscience
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.518
H-Index - 90
eISSN - 2327-9834
pISSN - 0018-5345
DOI - 10.21273/hortsci.39.4.771a
Subject(s) - olea , shoot , transpiration , stomatal conductance , salinity , cutting , horticulture , chemistry , olive trees , cultivar , oleaceae , chloride , halophyte , saline , botany , photosynthesis , biology , ecology , biochemistry , organic chemistry , endocrinology
Physiological responses of olive cuttings of `Koroneiki' and `Picual' ( Olea europaea L.) to zero or high salinity (NaCl 100 mmol·L -1 ) and to ambient CO 2 (380 ppm) or elevated (700 ppm) CO 2 concentration were studied in sand culture in greenhouses. Growth parameters, net gas exchange of leaves and leaf chloride concentration were measured after two months of treatment. `Koroneiki' had significantly greater shoot growth and net assimilation of CO 2 (Ac) at elevated CO 2 than at ambient CO 2 but this difference disappeared under salt stress. Growth and Ac of `Picual' did not respond to elevated CO 2 regardless of salinity treatment. Stomatal conductance and leaf transpiration were lower at elevated CO 2 such that leaf water use efficiency increased at elevated CO 2 in both cultivars regardless of saline treatment. The saline treatment increased leaf chloride (Cl) concentration and reduced growth and net gas exchange responses in both cultivars. There was no difference in leaf Cl accumulation between the two varieties. At high salinity, elevated CO 2 had little effect on leaf Cl implying that at least in `Koroneiki', Cl accumulation was not closely linked to water uptake.