Plant Process and Function

en Bacterial bio surfactants stimulate the growth of beans and improve foliar-treated Fe absorption Bacterial bio surfactants stimulate the growth of beans and improve foliar-treated Fe absorption تنظیم کننده های رشد گیاهی Plant Growth Regulators پژوهشي Research <div style="text-align: left;">Due to the eco-systemic hazardous effects of surfactants, biosurfactants are recommended as wetting agents to increase the efficiency of foliar application of nutrients. Moreover, some of them could act as plant growth promoting agents. The aim of the present study was to assess the biosurfactant effect on iron foliar nutrition and its effects on bean growth. Biosurfactant production was investigated in seven Bacillus isolates from compost. Among them, B. nealsonii 104C, with the ability to produce glycolipid biosurfactant, was selected for the greenhouse study. Three concentrations of Fe, including zero, one, and two percent, and two levels of biosurfactant (zero and 50 mgL-1) were tested in a factorial experiment with a randomized complete block design on the bean plants growing hydroponically. The results showed that foliar application of iron without adding biosurfactant at one and two percent concentrations increased the plant yield by 2.08 and 2.8 times, respectively. Zero, one, and two percent iron plus biosurfactant increased the yield up to 4, 3.3, and 4.2 times compared to the control. The highest bean height, total dry weight, leaf and stem weight, and number of pods were observed in the biosurfactant treatment plus 2% iron. It seems that biosurfactants could be used in the bean plant organic farming as an iron transition facilitator via foliar application or as a plant growth stimulator.</div> Due to the eco-systemic hazardous effects of surfactants, biosurfactants are recommended as wetting agents to increase the efficiency of foliar application of nutrients. Moreover, some of them could act as plant growth promoting agents. The aim of the present study was to assess the biosurfactant effect on iron foliar nutrition and its effects on bean growth. Biosurfactant production was investigated in seven Bacillus isolates from compost. Among them, B. nealsonii 104C, with the ability to produce glycolipid biosurfactant, was selected for the greenhouse study. Three concentrations of Fe, including zero, one, and two percent, and two levels of biosurfactant (zero and 50 mgL-1) were tested in a factorial experiment with a randomized complete block design on the bean plants growing hydroponically. The results showed that foliar application of iron without adding biosurfactant at one and two percent concentrations increased the plant yield by 2.08 and 2.8 times, respectively. Zero, one, and two percent iron plus biosurfactant increased the yield up to 4, 3.3, and 4.2 times compared to the control. The highest bean height, total dry weight, leaf and stem weight, and number of pods were observed in the biosurfactant treatment plus 2% iron. It seems that biosurfactants could be used in the bean plant organic farming as an iron transition facilitator via foliar application or as a plant growth stimulator. Bacillus, Bean yield, Glucolipid biosurfactant, Iron sulfate Bacillus, Bean yield, Glucolipid biosurfactant, Iron sulfate 67 76 http://jispp.iut.ac.ir/browse.php?a_code=A-10-1712-2&slc_lang=en&sid=1 Esmaeil Karimi Esmaeil Karimi sm_ka80@yahoo.com Yes Department of Soil Science and Engineering, Faculty of Agriculture, University of Maragheh, Iran Department of Soil Science and Engineering, Faculty of Agriculture, University of Maragheh, Iran Mahtab Derogarian Mahtab Derogarian mahtab.as74@yahoo.com No Department of Soil Science and Engineering, Faculty of Agriculture, University of Maragheh, Iran Department of Soil Science and Engineering, Faculty of Agriculture, University of Maragheh, Iran Mohammad Bagher Hassanpouragdam Mohammad Bagher Hassanpouragdam hassanpouraghdam@gmail.com No Department of Horticulture Science and Engineering, Faculty of Agriculture, University of Maragheh, Iran Department of Horticulture Science and Engineering, Faculty of Agriculture, University of Maragheh, Iran Aliasghar Alilo Aliasghar Alilo aliasghar.aliloo@gmail.com No Department of Plant Engineering and Genetics, Faculty of Agriculture, Maragheh University, Iran Department of Plant Engineering and Genetics, Faculty of Agriculture, Maragheh University, Iran Mojtaba Amini Mojtaba Amini Department of Chemistry No Department of Chemistry, Faculty of Chemistry, University of Tabriz, Iran Department of Chemistry, Faculty of Chemistry, University of Tabriz, Iran