CALLUS INDUCTION AND PLANTLET REGENERATION OF Salicornia bigelovii TORR. Cloning and Expression Characterization of a SbDREB gene from Salicornia bigelovii Torr. Effects of Exogenous Spermidine on the Content of Polyamines in Salicornia bigelovii Torr.under NaCl Stress Feeding Value of Two Halophytes Physiological responses of Salicornia bigelovii to salt stress during the flowering stage