بررسی اثر سیلیکون بر تغییرات کلروفیل و پروتئین محلول کل در گیاه جو تحت تنش خشکی

Silicon is the second most common element in soil that has beneficial effects in improving the biotic and abiotic stress
tolerance in plants. In this study, the effect of drought stress and silicon (2 mM sodium silicate / kg ) in total protein and
chlorophyll in two varieties of barley (Hordeum vulgar L.) with different tolerance to drought named, Gorgan
(sensitive) and Nimruz (resistant) and three treatments: control, drought and silicon-drought at tillering stage using
spectrophotometry and SDS-PAGE gel electrophoresis methods was investigated. Test was performed in a randomized
factorial design with three treatments (control, drought, and silicon-drought) in three replications. Experimental results
indicate that the changes in total protein content in both cultivars in drought and silicon -drought is similar and the
amount of total protein decreased under drought stress in both but, this was offset by a decrease in silicon. The change
of total protein content in resistant cultivar was more significant than semi-sensitive. Chlorophyll content in both
cultivars in the presence of drought and silicon-drought changed significantly. Drought stress decreased chlorophyll
amount in the way that, Silicon present increased the amount of chlorophyll in the plants under drought stress. These
results indicate the positive effect of silicon on yield changes of plants under the stress.