Effects of Two Species of Pseudomonas and Nitrogen Levels on Dry Matter, Chlorophyll index and N and Zn Uptake by Spinach Plant
Article Type:
Research/Original Article (دارای رتبه معتبر)
Abstract:
Pseudomonas species are usually considered as plant growth promoting bacteria which in combination with nitrogen fertilizers could exert beneficial effects on growth and nutrients uptake by plants. It seems that by using these bacteria and nitrogen fertilizer we will be able to improve growth and nutrient uptake by spinach plant as a important vegetative in human diet. To achieve this purpose, in a factorial experiment on the basis of randomized complete blocks design with three replications, spinach plant (Spinacia oleracea L.) were inoculated with Pseudomons fluorescens or P.putida or left un-inoculated as control. Three levels of nitrogen (0, 125 and 250 mg N Kg-1) as urea were applied to the pots containing 2 kg of sterile soil. Statistical analysis showed that with increasing levels of nitrogen in soil from 0 to 250 mg kg-1, Zn uptake, leaf chlorophyll index and plant dry weight were significantly increased. By bacterial inoculation, shoot and root dry weights of spinach showed significant increase compared to the non bacterial control and shoot and root dry weights were enhanced by 20% and 28.1% in plants inoculated with P.fluorescens compared to the non-bacterial control. Leaf chlorophyll index was increased by 22.2% and 13.8% in P.putida and P.fluorescens treated plants, respectively compared to the control. Total N content in root and shoot of spinach was significantly increased in bacterial treatments specially in P.fluorescens treated plants compared to the non-bacterial control. Zn content in shoot was significantly decreased in plant inoculated with P. putida compared to the non-bacterial control. Based on the result obtained in this study, P.fluorescens caused a marked increase in growth and N uptake by development of plant root system and increasing water and nutrients uptake efficiency. Moreover, it led to improved Zn uptake in spinach plant through siderophore production.
Language:
Persian
Published:
Applied Soil Reseach, Volume:6 Issue: 1, 2018
Pages:
62 to 72
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