Tahereh Goudarzi; Leila Tabrizi; Hossain Ali Alikhani; Vahideh Nazeri; Farzad Najafi
Abstract
To evaluate the effects of four licorice plant growth-promoting bacteria (PGPB), i.e. Pantoea agglomerans (S72), Serratia rubidaea (S28) Pseudomonas azotoformans (E101), Pseudomonas frederiksbergensis (E56) on licorice seed germination and seedling growth, two experiments were conducted at the Research ...
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To evaluate the effects of four licorice plant growth-promoting bacteria (PGPB), i.e. Pantoea agglomerans (S72), Serratia rubidaea (S28) Pseudomonas azotoformans (E101), Pseudomonas frederiksbergensis (E56) on licorice seed germination and seedling growth, two experiments were conducted at the Research Laboratory and Greenhouse, University of Tehran in 2019. Treatments were bacterial strains in eight levels (sole or in combination) and growing media at four levels of M1 (sand + perlite (1: 1)), M2 (soil + cow manure), M3 (soil + mycorrhiza fungi) and M4 (soil + mycorrhiza fungi+ cow manure). Germination quality criteria and some morphological traits of two-month-old seedlings were evaluated. The results of seed germination showed that in most of the evaluated traits, bacterial treatments performed better than the control, although in some cases, there were no significant differences with the control. Also, in some cases, endophytic bacteria had an effective role in improving seed germination index compared to rhizospheric bacteria. According to the experiment results of seedling growth, M4 in combination with two endophytic bacteria (E101 and E56), of the Pseudomonas genus in licorice plants, had a superior performance in improving the initial growth and establishment qualities of the licorice plants. Regarding most of the traits, the co-application of mycorrhiza with S28 (M3B3) showed the lowest values. The results of this study indicated the potential use of licorice endophytic bacteria as a source of biofertilizer for the improvement of licorice seed germination and growth and, if possible, for similar applications in other plant species. AbbreviationsM1 (sand + perlite (1: 1)), M2 (soil + cow manure), M3 (soil + mycorrhiza fungi) and M4 (soil + mycorrhiza fungi + cow manure), Plant growth-promoting bacteria (PGPB), Indole-3-acetic acid (IAA), B1 (Pantoea agglomeransz (S72)), B2 (Serratia rubidaea (S28)), B3 (Pseudomonas azotoformans (E101)), B4 (Pseudomonas frederiksbergensis (E56)
Afsaneh Rashnoo; Zahra Movahedi; Majid Rostami; Mehdi Ghabooli
Abstract
In two independent experiments, acclimatized chicory plants were transferred into an aeroponic system and to the soil. Then, the effects of biofertilizer (Nitrokara) and culture filtrate of Piriformospora indica were investigated on some plant characteristics in both aeroponic and soil cultivation system ...
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In two independent experiments, acclimatized chicory plants were transferred into an aeroponic system and to the soil. Then, the effects of biofertilizer (Nitrokara) and culture filtrate of Piriformospora indica were investigated on some plant characteristics in both aeroponic and soil cultivation system under greenhouse conditions. The plants were foliar sprayed with three different biofertilizer concentrations (1, 2, and 3 g/L) and P. indica culture filtrate (2.5, 5, and 7.5 mL in 100 mL water) following 20, 40 and 60 days after transplanting to the aeroponic and soil culture media. Results showed that the highest vegetative growth (e.g. plant height, root length, number of leaves per plant, root and shoot dry weights) and physiological traits (e.g. relative water content, proline, anthocyanin content, chlorophyll a, and chlorophyll b) were observed with 7.5 mL of P. indica culture filtrate in both aeroponic and soil culture media. Besides, the best results for all studied traits were obtained from 3 g/L of biofertilizer application in the both culture media. In both experiments, better results were obtained from the aeroponic system than the soil culture for P. indica production.
Shiva Zaferanchi; Saeid Zehtab Salmasi; Seyed Yahya Salehi Lisar; Mohammad Reza Sarikhani
Abstract
The present study was carried out to investigate biochemical responses of marigold (Calendula officinalis L.) to Bio-organic fertilizers. Effects of co-inoculation of two plant growth-promoting rhizobacteria (PGPR) (Azotobacter sp.145PI and Azospirillum sp.AC49I), humic acid (HA) (10 kg ha−1), ...
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The present study was carried out to investigate biochemical responses of marigold (Calendula officinalis L.) to Bio-organic fertilizers. Effects of co-inoculation of two plant growth-promoting rhizobacteria (PGPR) (Azotobacter sp.145PI and Azospirillum sp.AC49I), humic acid (HA) (10 kg ha−1), vermicompost (VC) (7 T ha−1) and combinations of these treatments were evaluated in two marigold cultivars [Isfahan double flower (DF) and single flower (SF)]. The biosynthesis of leaf protein, soluble and insoluble carbohydrate contents were increased in treated plants, while total free amino acid content was not influenced by treatments. Fertilizers also had positive impact on leaf and flower pigments, total flavonoid content, and total phenolic contents. Maximum amounts of anthocyanins were obtained in the DF cultivar treated by VC+PGPR and VC, which were 11.414 and 11.192 µmol g-1 FW, respectively. The SF cultivar treated by PGPR (36.11 %) and also the same cultivar treated by VC (33.39 %) had the highest antioxidant activities. In general, simultaneous application of fertilizers and also vermicompost were recognized as the best treatment for marigold plants. In conclusion, the findings of the current study confirmed that chemical composition and antioxidant activity of marigold can be positively influenced by Bio-organic fertilizers; therefore they can be used to obtain medicinal plants with improved quality during sustainable agricultural practices.
Asma Chbani; Sandy Majed; Hiba Mawlawi
Abstract
Nowadays, organic fertilizers play an important role in agriculture. They are progressively substituting chemical fertilizers to prevent their harmful impact on human health and the environment. They provide high yield, better quality products and a shorter period of harvesting crops. In this study, ...
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Nowadays, organic fertilizers play an important role in agriculture. They are progressively substituting chemical fertilizers to prevent their harmful impact on human health and the environment. They provide high yield, better quality products and a shorter period of harvesting crops. In this study, the mineral elements: primary macronutrient (N, PO3- and K+), secondary macronutrient: (Ca2+, Mg2+ and SO2-), micronutrient (Na+ and Cl-), alkalinity (HCO3-) and other elements (NO2- and NO-), of three seaweeds were determined: chlorophytae (Ulva lactuca, Ulva linza) and phaeophytae (Padina pavonica). The nitrogen content was the most abundant element in the three Mediterranean seaweeds [79.85 - 57.16 - 126.09 [×10³ mg L-1], respectively, with a maximum to the chlorophytae U. lactuca. This is true also for other macroelements (K and P); their values are higher in green seaweed than the brown Padina pavonica. Secondary elements (Ca and Mg) also show higher values in green algae, with a maximum value in Ulva lactuca. There is no significant difference concerning the values of microelements Na+ and Cl- between green and brown algae. The values of nitrite and nitrate are equivalent for the two green algae, while these items are virtually nonexistent in the brown algae. In conclusion, interesting values of the green alga Ulva lactuca could suggest the use of aqueous extract of this alga such as biofertilizant.