Environmental Engineering Reference
In-Depth Information
3.3. The Fluctuation of the Ion Contents under Salt Stress
The difference in ion concentration is another important feature under salt stress, thus we
also detected the contents of the Na
+
, K
+
, and Cl
-
under different NaCl treatments. Firstly the
situation changes of young seedlings were examined. From the Figure 3A, we can find that
the contents of both Na
+
and Cl
-
in leaves and roots increased significantly with the increase
of NaCl concentration.
Figure 3(A). Changes of ion content in young seeding under salt stress.
With 300 mM NaCl treatment, the content of Na
+
in leaves and roots of ZH13 increased
10.2 and 2.8 respectively; the situation of Cl
-
were 8.5 and 2.1. However, the values for BB52
were 5.5, 2.1, 2.9, and 1.5 correspondingly. Between two soybean strains, the variation of ion
contents in roots was tiny, but the difference was great in leaves (Figure 3A). For K
+
the
situation
was exactly adverse.
The consequence shows that the NaCl inhibited the absorption
of K
+
significantly, thus the K
+
content decreased in leaves and roots, especially in roots. K
+
has a key role in the growth and development of plants, hence the K
+
/Na
+
ratio is a marker of
the resistance. Generally, compared to ZH13, the degree of change of all the ion contents in
BB52 was
bigger, especially the content of K
+
.
In other words, under salt stress the BB52
maintained a significant higher K
+
/Na
+
ratio than ZH13, just as the result suggests. Therefore,
we can conclude that the BB52 was endowed with stronger resistance.
