بررسي تاثير پتاسيم سيليكات و نانو سيليس بر رشد و نمو توت فرنگي تحت شرايط كم آبي

چكيده انگليسي :

Effects of Potassium Silicate and Nanosilica on Growth and Development of Strawberry under Water Deficit Conditions Safoora Dehghani Poodeh safoora dehghanipoodeh@yahoo com Date of submission May 7 2012 Department of Horticultural Science Isfahan University of Technology Isfahan 84156 83111 IranDegree M Sc Language FarsiC Ghobadi Ph D Assist Professor Supervisor cyrus@cc iut ac irAbstractgrowth and development of plants are severely restricted by a variety of environmental stresses Amongthe abiotic stresses drought is a major factor that limits agricultural crop production Strawberry is one ofthe most popular fruit crops produced in world and due to having delicate flavor and rich vitamin contentis a regular part of diets of many people Silicon Si is generally considered as a beneficial element for thegrowth of higher plants especially for those grown under stressful environment There are a few studiesabout the effects of nanoparticles on plants So the objects of this study were to examine the effects ofsilicon on growth and development of strawberry Fragaria ananassa Camarosa under water stressconditions and comparison between two Si compounds A factorial experiment in a completelyrandomized design with three replications were used to investigate the effects of three irrigation levels 1 0SMD Soil Moisthre Deplation 0 75 SMD and 0 6 SMD and eight levels of silicon compounds 0 5 10and 15 mM of potassium silicate K2SiO3 and 0 10 20 and 30 mg kg of media from nanosilica SiO2 Potassium hydroxide KOH at concentration of 30 mM in a separate treatment was used for removing ofthe effect of potassium in potassium silicate Tensiometer used for Measuring soil water and schedulingirrigation quantitative characteristics such as petiole diameter and length leaf area leaf number freshand dry weight of shoot and root specific leaf area electrolyte leakage Chlorophyll content relativewater content RWC proline Chlorophyll fluorescence net photosynthetic rate Pn stomataconductance Gs intercellular CO2 Ci transpiration rate E Mesophyll efficiency ME and water useefficiency WUE mineral nutrition Na K Ca and Si in shoot and root were measured The resultsshowed that by increasing the levels of water stress more quantitative characteristics specific leaf area relative water content RWC Chlorophyll fluorescence net photosynthetic rate Pn stomata conductance Gs transpiration rate E significantly decreased Application of silicon significantly increased morefactors above Silicon application had no significantly effect on electrolyte leakage relative water content RWC leaf area and Chlorophyll a and b On the other hand water stress increased electrolyte leakage Chlorophyll content proline Mesophyll efficiency ME and water use efficiency WUE Si significantlydecreased specific leaf area proline and transpiration rate Chlorophyll content Mesophyll efficiency ME and water use efficiency WUE improved by Si application Analyses of Na K and Ca showedaccumulation of these ions in the shoot and root under water stress conditions Si treatments significantlydecreased Na and Ca accumulation in shoot Potassium silicate significantly increased Na concentration inroot Application of silicon as potassium silicate increased the silicon contents of root and shoot Thesilicon uptake was decreased in water stress conditions interaction between Si treatments and the levels ofwater deficit in most of the measured parameters was significant Results suggest that In more investigatedfactors 10 mg kg nanosilica and 10 mM potassium silicate had the most effect In conclusion Siliconapplication had beneficial effects on strawberry plants and addition of Si could alleviate water stress Therefore application of Si may be one approach to improve growth of plants in arid or semi arid areasunder water stress conditions Key words Nanosilica Potassium Silicate Water Stress Strawberry

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بررسي تاثير پتاسيم سيليكات و نانو سيليس بر رشد و نمو توت فرنگي تحت شرايط كم آبي

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