Environmental Engineering Reference
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3.3. Effects of Salt Stress on Chlorophyll Fluorescence
Fv/Fm, ΦPSII and qP decreased similarly in both ZH13 and BB52 with increasing
salinity (Figure 3A, B, C). In addition their values in BB52 were higher than in ZH13 under
the same salt stress. In contrast, NPQ (Figure 3D) significantly increased in two varieties and
the value in ZH13 was significantly higher than that in BB52.
Figure 3. Changes of maximal photochemical efficiency of PSII (Fv/Fm, A), actual photochemical
efficiency of PSII (ΦPSII, B), proportion of open PSII (qP, C) and nonphotochemical quenching
(NPQ, D).
3.4. Effects of Salt Stress on Water Potential, Relative Water Content and
Proline Content
ψ w (Figure 4A) and RWC (Figure. 4B) in leaves of ZH13 and BB52 were significantly
reduced by salt stress. On the contrary, proline content markedly increased (Figure. 4C),
especially at the concentration when NaCl was more than 100mM. Under 300mM NaCl, the
proline contents in ZH13 and BB52 leaves were approximately 38.2 times and 24.4 times
higher than in the control, respectively.
3.5. Effects of Salt Stress on Ion Accumulation
The results of ion content are shown in Figure 5. With increasing NaCl concentration, the
contents of Na + and Cl - in leaves and roots (Figure 5A,C) increased significantly in both
while the accumulations of Na + and Cl - in leaves of ZH13 were higher than those in BB52.
On the contrary, the content of K + (Figure 5B) decreased, especially in roots. The K + /Na +
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