Co-Authors:
Tugendhaft, Y., Institute of Plant Sciences, Agricultural Research Organization, Gilat Research Center, M.P. Negev 2, Israel, Institute of Biochemistry, Food Science, and Nutrition, Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot, Israel
Eppel, A., Institute of Plant Sciences, Agricultural Research Organization, Gilat Research Center, M.P. Negev 2, Israel
Kerem, Z., Institute of Biochemistry, Food Science, and Nutrition, Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot, Israel
Barazani, O., Institute of Plant Sciences, Israel Plant Gene Bank, Agricultural Research Organization, Bet Dagan, Israel
Ben-Gal, A., Institute of Soil Water and Environmental Sciences, Agricultural Research Organization, Gilat Research Center, M.P. Negev 2, Israel
Kadereit, J.W., Institut für Spezielle Botanik und Botanischer Garten, Johannes Gutenberg-Universität Mainz, Mainz, Germany
Dag, A., Institute of Plant Sciences, Agricultural Research Organization, Gilat Research Center, M.P. Negev 2, Israel
Abstract:
Physiological drought response was evaluated for two olive cultivars commonly grown under rain fed conditions ('Souri' and 'Picual') and another selected for intensive, irrigated cultivation ('Barnea'). 'Souri' is a traditional local Israeli cultivar, 'Picual' originated in Spain and 'Barnea' is a modern Israeli cultivar.Trees in pots were alternatively provided well irrigated conditions (100% FC, field capacity) or allowed to dry, first to 33% FC and then to 10% FC. Under conditions of greatest water availability, the 'Barnea' cultivar had the highest stomatal conductance and net photosynthesis, significantly higher than that found in 'Souri'. Stomatal conductance and leaf water potential of 'Souri' and 'Picual' at 33% FC were not affected relative to the well irrigated treatment but decreased significantly at 10% FC. Photosynthetic parameters of 'Souri' and 'Picual' were not affected by water stress. Stem growth was also not affected by drought in 'Souri' but was reduced at 10% FC in 'Picual'. In contrast, the 'Barnea' showed higher sensitivity to low water availability with stomatal conductance and net photosynthesis reduced at 33% FC and sharp decreases in these and leaf water potential occurring at 10% FC. At 10% FC 'Barnea' trees showed stem shrinkage, a phenomenon not observed in the other cultivars. These results suggest a tradeoff between selection for suitability in intensively irrigated orchards and tolerance to drought. © 2015 Elsevier B.V..
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