Co-Authors:
Heth, D., Agricultural Research Organization, The Volcani Center, No. 3461- E, 1992 series, Bet Dagan, Israel
Heth, D., Department of Agronomy and Natural Resources (Forestry Section), ARO, The Volcani Center, Bet Dagan, 50250, Israel
Macrae, S., Division of Forest Science and Technology, CSIR, PD, Box 17001, Congella 4013, Durban, South Africa
Abstract:
Twelve seed sources of Eucalyptus camaldulensis Dehn. were screened for salt tolerance under nursery conditions by measuring the survival (in percent) of seedlings that were watered for 18 days with a very high salt solution (ECw 43, 9 dS/m). The salt-tolerant sources (in decreasing order of survival) were: Port Lincoln (Southern Australia), Silverton (Broken Hill, "var. subcinerea"), New South Wales, and Ashburton River (Western Australia). The most salt-sensitive sources were from Nathalia (Victoria) and Katherine (Northern Territory). There was much genetic variation within the seed source populations. Some individuals of sal t-sensitive seed sources were salt tolerant, and may be useful material for selection of a salt-tolerant population by vegetative propagation. Leaf shedding and salt sensitivity were correlated. Most salt-tolerant seed sources preserved their leaves under increasing salt stress. Under the conditions of this trial, water salinity was not the only factor that limited height growth. Most seed sources continued to grow with ECw values of 1, 8 to 3, 7 dS/m. Port Lincoln (SA) provenance was the only seed source that increased in height when water salinity was >3, 7 dS/m. Osmotic adaptation developed in plants subjected to a gradual increase in salt stress. Under this hardening process, plant survived very high saline watering of 43, 9 dS/m for nearly three weeks. © 1993 Taylor & Francis Group, LLC.
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