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Lee, Youngwook,Krishnamoorthy, Ramasamy,Selvakumar, Gopal,Kim, Kiyoon,Sa, Tongmin The Korean Society for Applied Biological Chemistr 2015 Applied Biological Chemistry (Appl Biol Chem) Vol.58 No.4
Arbuscular mycorrhizal fungi (AMF) and plant growth-promoting bacteria (PGPB) can have multiple impacts on phytohormone production and nutrient uptake to improve plant growth. Co-inoculation of AMF and PGPB can mitigate the effects of salinity in plants. This study was conducted to evaluate the efficacy of co-inoculation of AMF (Glomus etunicatum) and Methylobacterium oryzae CBMB20 to alleviate salt stress and improve maize growth. Single and co-inoculation of AMF and M. oryzae CBMB20 significantly increased dry biomass, AMF root colonization, and nutrient accumulation in maize plants under salt stress. The proline content and Na uptake were significantly reduced in co-inoculation of AMF and M. oryzae CBMB20. In addition, co-inoculation of AMF and M. oryzae CBMB20 (soil) showed higher AMF density and AMF colonization compared to single AMF treatment. Among all treatments, co-inoculation of AMF and M. oryzae CBMB20 (soil) was more effective to ameliorate salt stress and improve plant growth. These results demonstrate that co-inoculation of AMF and M. oryzae CBMB20 (soil application) may be an effective alternative to enhance plant growth under salinity stress.
Lee, Hohyoung,Lee, Jeongbeom,Park, Gijung,Han, Yunseok,Lee, Youngwook,Cho, Gunhee,Kim, Hanam,Chang, Hongyoung,Min, Kyoungwook American Institute of Physics 2015 Review of scientific instruments Vol.86 No.8
<P>A high-speed impedance measurement system was developed, which enables the measurement of various characteristics of CW and pulsed plasmas with time resolution of less than a microsecond. For this system, a voltage and current sensor is implemented in a printed circuit board to sense the radio frequency signals. A digital board, which has a high-speed analog to digital converter and a field-programmable gate-array, is used to calculate the impedance of the signal. The final output of impedance is measured and stored with a maximum speed of 3 Msps. This sensor system was tested in a pulsed-plasma by applying it to the point between the matching box and the plasma chamber. The experimental equipment was constructed connecting the matching box, a 13.56 MHz generator, a 2 MHz generator that produced pulsed power, and a pulse-signal generator. From the temporal behavior of the measured impedance, we were able to determine the time intervals of transient states, especially of the initial active state. This information can be used to set the pulse frequency and duty for plasma processing.</P>