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Subject: Plant Physiology × Author: Sinky × End date: 2022 × Start date: 2022 × Thesis Type: Ph.D ×
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    ThesisItemOpen Access
    Silicon induced amelioration of salinity stress through physiological and biochemical alterations in mungbean (Vigna radiata L. wilczek) and wheat (Triticum aestivum L.)
    (CCSHAU, Hisar, 2022-07) Sinky; Sharma, Kamal Dutt
    The present investigation was conducted under two experiments one on mungbean (MH 318) and other on wheat (WH 1223) crop grown in earthen pots under screen-house conditions of Botany and Plant Physiology department, CCS Haryana Agricultural University, Hisar, to study ef fect of silicon application on plant growth characterestics, gas exchange attributes, biochemical changes, yield and its attributes and nutrient uptake under control and salinity stress conditions. The experiment was laid out in CRD consisting of three chloride dominated salinity levels i.e., 0 dS/m, 4dS/m and 6dS/m stress in mungbean and 0, 5dS/m, 10dS/m in wheat. Silicon was applied in the form of sodium meta-silicate (Na2SiO3.5H20) through soil application before sowing in mungbean (50 ppm) and in wheat (80 ppm) and foliar application of 50, 100 ppm in mungbean and 100, 150 ppm in wheat. Salinity stress decreased the growth of mungbean and wheat by affecting morphophysiological and biochemical traits a nd nutrient uptake of the crop. The plant water relation parameters such as leaf water potential, leaf osmotic potential, RWC and gas exchange attributes were negatively affected under salinity stress condition. Chlorophyll stability index and membrane stability index decreased with increasing salinity stress. However, silicon application increased the growth parameters under control as well as under salinity stress condition in both the crops. A significant increase in the activity of SOD, CAT, POX and total antioxidant activity occur under salinity stress and silicon treatments further enhanced their level indicating the role of silicon in enhancing antioxidant capacity of the crop. Silicon application enhanced the K, Fe, Zn and Si content in different plant parts and reduced the uptake of Na, Cl. Silicon application improved the yield and its attributes by maintaining plants water status and various physiological and biochemical processes and nutrient uptake. Foliar application of 100ppm silicon was found more effective in mungbean and 150ppm foliar application in wheat compared to other treatments. Grain/seed yield showed significant positive correlation with different physio–biochemical and yield components such as photosynthetic rate, stomatal conductance, chlorophyll fluorescence but SOD, CAT and POX showed negative correlation with yield and other yield attributes.