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2015 ; 6
(ä): 759
Nephropedia Template TP
gab.com Text
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English Wikipedia
Silicon enhanced salt tolerance by improving the root water uptake and decreasing
the ion toxicity in cucumber
#MMPMID26442072
Wang S
; Liu P
; Chen D
; Yin L
; Li H
; Deng X
Front Plant Sci
2015[]; 6
(ä): 759
PMID26442072
show ga
Although the effects of silicon application on enhancing plant salt tolerance
have been widely investigated, the underlying mechanism has remained unclear. In
this study, seedlings of cucumber, a medium silicon accumulator plant, grown in
0.83 mM silicon solution for 2 weeks were exposed to 65 mM NaCl solution for
another 1 week. The dry weight and shoot/root ratio were reduced by salt stress,
but silicon application significantly alleviated these decreases. The chlorophyll
concentration, net photosynthetic rate, transpiration rate and leaf water content
were higher in plants treated with silicon than in untreated plants under salt
stress conditions. Further investigation showed that salt stress decreased root
hydraulic conductance (Lp), but that silicon application moderated this
salt-induced decrease in Lp. The higher Lp in silicon-treated plants may account
for the superior plant water balance. Moreover, silicon application significantly
decreased Na(+) concentration in the leaves while increasing K(+) concentration.
Simultaneously, both free and conjugated types of polyamines were maintained at
high levels in silicon-treated plants, suggesting that polyamines may be involved
in the ion toxicity. Our results indicate that silicon enhances the salt
tolerance of cucumber through improving plant water balance by increasing the Lp
and reducing Na(+) content by increasing polyamine accumulation.