اثر سالیسیلیک اسید بر اجزاء عملکرد و رشد سویا تحت شرایط تنش شوری

In order to investigate the effect of applied salicylic acid (SA) on growth, yield components, dry matter in an economically important plant, (Glycin max L.) under salinity stress conditions, an experiment was conducted in agriculture farm of Marvdasht, during ۲۰۱۰. The experimental design was factorial based on completely randomized design with three replications. The first factor included ۴ concentrations of (SA) (۰, ۰.۲۵, ۰.۵,۱mM) and  the second factor consisted of ۳ concentrations of NaCl (۰, ۳,۶ dS/m). Hormone we sprayed on the leaves in two Steps by ۷ days interval. Salinity treatments (NaCl) were applied by irrigation water after hormonal application.  Results show that the highest prolin and chlorophyll content were obtained in SA application treatment. Salinity caused prolin to increase and chlorophyll to decrease. The highest leaf specific area was obtained in SA applied treatments however salinity decreasedSLA ratio.  The highest dry matter in poding stage was in ۰ ds-۱ salinity level and ۰.۵ mM SA. In investigation of yield components it was observed that salt stress and SA had significant effect on the number of seeds in pod. As a result, increasing in ۱۰۰seed weight and number of pod per plant, caused yield to increase. The highest ۱۰۰seed weight was observed in ۰ ds-۱ salinity level and ۰.۲۵, ۰.۵, ۱ mM SA concentrations. Also the highest number of pod per plant at ۰ ds-۱ salinity level and ۰.۲۵ mM SA concentrations was obtained. The highest number of pods per plant was obtained at ۰ ds-۱ salinity level and ۰.۵, ۱ mM SA concentration. Generally salinity decreased grain yield by reducing grains per pod and grain weight and SA reduced these harmful effects by increasing prolin and chlorophyll content.