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There is wide variation in  Citrus  and related genera in tolerance to cold and salt stress. While  Poncirus trifoliata  (L.) Raf. is an important rootstock for cold regions, it is salt sensitive.  C. grandis  (L.) Osb., on the other hand, is cold sensitive, but is relatively salt hardy. We are attempting to map genes (quantitative trait loci, QTLs) influencing salt and cold tolerance in  Cirrus,  using a BC 1  population from [ C. grandis  ×  (C. grandis  ×  P. trifoliata)].  As a first step, 2 year old containerized replicates of individual BC 1  progeny plants have been salinized with 30 mM NaCl over a 9 month period under greenhouse conditions. Growth response under saline conditions, as evaluated by plant height and node number, varied significantly between individual progeny. Concentrations of 11 macro- and micro-elements, including Na and Cl, in leaf and root tissues were also determined. Ultimately, this data will be analyzed in conjunction with our current linkage map of this population, which consists of more than 200 marker genes, in order to map QTLs for salt tolerance.

555 PB 368 GROWTH AND ION CONTENT OF INTERGENERIC BC1 CITRUS × PONCIRUS PROGENY IN RESPONSE TO A 9-MONTH SALINIZATION PERIOD