Effects of Exogenous Spermine on Seed Germination and Early Growth of Sunflower Seeds Under Salinity Stress

Authors : Fatma MUTLU, Suna BOZCUK

Pages : 635-644

View : 20 | Download : 10

Publication Date : 2000-12-01

Article Type : Research Paper

Abstract :The effects of various concentrations insert ignore into journalissuearticles values(0.01, 1, 2mM); of spermine insert ignore into journalissuearticles values(Spm); on germination and some early growth parameters of sunflower insert ignore into journalissuearticles values( Helianthus annuus L. cv. Santafe); seeds were investigated in media containing different concentrations of NaCl insert ignore into journalissuearticles values(50, 100, 200mM);. Regardless of its concentrations, application of Spm under non-saline conditions remained ineffective on germination percentage as well as on the early growth parameters studied insert ignore into journalissuearticles values(length of radicle, fresh and dry weights);. The salt, depending on its concentration, inhibited or delayed the germination to a great extent. The growth parameters studied in the early growth period were also adversely affected by salt treatment. However, at 200mM NaCl, Spm at concentrations of 0.01 and/or 1mM completely overcame the germination-inhibiting effect of salt, so that the germinations in these two combinations, as compared to their controls, increased as much as 8 fold. On the other hand, the fresh weight increased in 50mM NaCl+0.01mM Spm and 100mM NaCl+1mM Spm combinations while the dry weight increased only in 50mM NaCl+0.01mM Spm combination. However, all salt+Spm combinations were found to be ineffective on the length of the radicle.
Keywords : Sunflower, salt stress, polyamines, spermine, germination, length of radicle, fresh and dry weight