Study on Sa lt－tolerance Ability in Rooted Cuttings of D ifferent Ca suar ina Clones

Based on the characteristic that branchlets of Casuarina is capable of forming roots bywater culture, rooted cuttings of 9 Casuarina cloneswere immersed by various concentration of salt solutions for stress treatments, then6 physiological or biochemical variables related to salt stresswere measured, and salt2tolerance ability among different Casuarina cloneswere compared. The results showed that: The critical salt concentration that p revent rooted cuttings from rooting very significantly was 5—10 g·kg- 1. 3 variables, namely Fp ro, EC and POD activity were determined asmain app raising indexes that evaluating salt-tolerace ability of Casua rina clones by p rincipal componentanalysis. And 3 superior salt-tolerance Casua rina cloneswere selected by means of compositive evaluation.