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Silicon Affects Transcellular and Apoplastic uptake of Some Nutrients in Plants

Pedosphere 2015年第2期25卷 192-201页

作者： Pooyan MEHRABANJOUBANI Ahmad ABDOLZADEH Hamid Reza SADEGHIPOUR Mahnaz AGHDASI Department of Biology Faculty of ScienceGolestan University

The positive effects of silicon(Si) on growth of plants have been well documented;however,the impact of Si on plant nutrient uptake remains *** growth,nutrient content and uptake of wheat(Triticum aestivum L.),canola(Brassica napus L.) and cotton(Gossypium hirsutum L.) plants were evaluated with or without application of 1.5 mmol L^(-1) *** of Si increased dry weights by 8%,30%and 30%and relative growth rate(RGR) by 10%,13%and 17%in the cotton,canola and wheat plants,*** plant relative water content(RWC) was also increased,but the plant transpiration was decreased by Si *** uptake and content of Ca^(2+) were 19%and 21%lower in the cotton and wheat plants with Si than those without Si,respectively;however,Si application increased both K^+ and Fe uptake and contents in all plant *** application reduced B uptake and content only in cotton and increased P and Zn^(2+) contents in all three plant *** decrease in Ca^(2+) uptake by Si application was sustained even in the presence of metabolic inhibitors 2,4-dinitrophenol and sodium *** of Ca^(2+) by Si application was enhanced or did not change when plant shoots were saturated with water vapor or their roots were exposed to low ***,Si application increased the uptake of transcellularly transported elements like K^+,P,Zn^(2+) and *** contrast,Ca2+ uptake which occurred via both apoplastic and transcellular pathways was decreased by Si application,possibly through reduction of apoplastic *** efficient nutrient uptake might be another promoting effect of Si on plant growth.

关键词： element content metabolic inhibitors plant growth uptake pathways water content

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