[Salt tolerance of wild soybeans in Jiangsu and its relation with ionic distribution and selective transportation]

The salt tolerance of 3 wild soybean (Glycine soja) populations was compared with their relative germination and seedling emergence. The results showed that the salt tolerance of Jiangsu wild soybean (JWS) was the strongest. Under NaCl stress, the dry matter accumulation in wild soybean seedlings decreased, root/shoot ratio increased, and these effects were greater in N23232 (salt-sensitive) than in JWS (salt-tolerant). Determinations on the ion contents in different organs indicated that the Na+ content was higher in stem than in other organs, and the accumulation of Na+ and Cl- in roots was significantly more in JWS than in N23232. The contents of these ions in JWS leaves were much less than those in N23232 leaves. There was no significant difference between selective absorptions of K+ and Na+ (ASK, Na) by the two populations, but the selective transportation of K+ and Na+ (TSK, Na) in stem and leaf was much higher in JWS than in N23232, resulted in the higher K+/Na+ ratio in JWS shoots. It is suggested that the main reason for the salt tolerance in salt-tolerant wild soybean was the accumulation of Na+ and Cl- in roots and stems and the higher selective transportation of K+ from root to shoot.