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Silicon alleviates salt
stress, decreases malondialdehyde content
and affects petal color of salt-stressed cut rose (Rosa
xhybrida L.) ‘Hot Lady’
Saeed Reezi*, Mesbah Babalar and Siamak Kalantari
Department of Horticulture, Faculty of Agriculture,
University of Tehran, Karaj, Iran.
*Corresponding author. E-mail:
sreezi57@yahoo.com.
Accepted
6 March, 2009 |
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A
greenhouse experiment was conducted to investigate the
effects of different levels of silicon (Si) application on
cut rose (Rosa xhybrida L.) ‘Hot Lady’ under
two levels of salt stress.
Four Si concentrations (0, 50, 100 and 150 ppm) as Si were
combined with a 25 mM NaCl (EC ≈ 3.8) level in the nutrient
solution supplied to the plants.
Addition of Si partially maintained membrane permeability
but only fully restored it to control levels in the Si50 and
Si100 treatments. 150 ppm Si with or without NaCl could not
alleviate or decrease cell wall damages. Inclusion of Si
significantly reduced malondialdehyde content and
chlorophyll content of salt-stressed plants in all
treatments except that of 150 ppm.
Maximum
chlorophyll content was noticed when 50 ppm Si was supplied.
Addition of 50 ppm Si increased the flower number in both
plants grown under salinity and unstressed conditions.
However, no significant difference was observed between 100
and 50 ppm Si accompanying with NaCl. Plants treated with
NaCl alone showed a reduction in plant leaf area, while the
reduction in plants treated with NaCl plus 50 and 100 ppm Si
were like control and other unstressed plants.
Key
words:
CIELAB, cut rose, ion leakage,
malondialdehyde,
salt stress, silicon. |
