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Benefits of Bio-inoculant Immobilization Process for the Development of Biofertilizers
Mak Chanratana, Ki-Yoon Kim, Walitang Denver, Sandipan Samaddar, Poulami Chatterjee,Shamim Ahmed, Yeon-Gyeong Kang, Sun-Young Jeon, Chae-Eun Pyo, and Tong-Min Sa 忠北大學校 農業科學硏究所 2016 農業科學硏究 Vol.32 No.2
Meeting the society’s increasing demand for food and energy require sustainable and readily�ᅠ�ᅠ available sources. The green revolution has been instrumental in creating sufficient crop productivity and maintained soil fertility. In the context of sustainable agriculture, the utilization of biofertilizers is of paramount importance. Commercial biofertilizers (bacteria/fungi) and their association directly or indirectly provide a beneficial effect on plant growth by increasing the supply and/or availability of nutrients to the host plant. However, large scale and field application of plant growth promoting microorganisms (PGPMs) as bioinoculant are still limited. Some of the major limitations are related to poor quality, short shelf-life and the lack of applicable formulation for bioinoculant. Immobilization using polymer matrix has been promising in enhancing protection, shelf life and slow release of bioinoculants. Furthermore, bacterial growth after immobilization in the polymer matrix is promoted with the supplementation of essential nutrients. The present review highlights the beneficial impacts of liquid formulation and exploiting alginate immobilized PGPMs for eco-friendly and sustainable crop production.
( Aritra Roy Choudhury ),( Mak Chanratana ),( Shamim Ahmed ),( Md Abdul Halim ),사동민 ( Tongmin Sa ) 한국환경농학회 2017 한국환경농학회 학술대회집 Vol.2017 No.-
The formulation of plant growth promoting bacteria as a potential bioinoculant to combat against various biotic and abiotic stresses have been shown to be beneficial for both plants and environment. The industrial application and market value of bioinoculants compared to conventional fertilizers are not high. The major limitations are low quality and the lack of applicable formulation for bioinoculants. These bioinoculants need proper carrier materials for delivery into the agricultural lands for their enhanced functionality, survivability and increase in their shelf life during storage. This study was conducted to compare the plant growth promoting effects of immobilized M. oryzae CBMB20 in chitosan and alginate beads on tomato plant under greenhouse conditions. The immobilized M. oryzae CBMB20 in various formulations were c ted in tomato (Solanum lycopersicum) seeds using 1% (w/v) carboxymethyl cellulose as an adhesive. Various physiological properties of plants such as plant length, dry weight of root and shoot, etc were measured after 15 days of transplanting. The survivability of M. oryzae CBMB20 and degradation of carrier material in soil was checked in regular intervals during the growing stage of tomato plant. The application of chitosan immobilized M. oryzae CBMB20 indicated up to 1.3 fold increase in the shoot and root lengths as well as plant dry weight of tomato plant under greenhouse condition compared to other treatments. The chitosan treated tomato seeds showed significant increase in germination percentage and chlorophyll content. Immobilized M. oryzae CBMB20 showed 1.5 fold higher survivability in tomato rhizosphere soil compared to free cells with around 4.35 log CFU g<sup>-1</sup> of soil for chitosan at 21 DAS. The alginate beads got fully degraded whereas there was partial degradation of chitosan beads after 30 days. Chitosan was able to keep a considerable survivability of M. oryzae CBMB20 for over 20 days. These observations confer that chitosan is more suitable carrier material for immobilizing M. oryzae CBMB20. Furthermore, such formulation holds good promise to be utilized with other PGPB strains and crops for potential large scale application in agricultural fields.
Trap Culture Technique for Propagation of Arbuscular Mycorrhizal Fungi using Different Host Plants
Gopal Selvakumar,Kiyoon Kim,Denver Walitang,Mak Chanratana,Yeongyeong Kang,Bongnam Chung,Tongmin Sa 한국토양비료학회 2016 한국토양비료학회지 Vol.49 No.5
Arbuscular mycorrhizal fungi (AMF) spore propagation and long term maintenance is still a complicated technique for farmers. The use of AMF for their ability to promote plant growth and protect plants against pathogen attack and environmental stresses demands AMF propagation for large scale application. This study aimed to propagate AMF spores by trap culture technique and assess their ability to propagate with different host plants in a continuous plant cycle. Mycorrhizal inoculation by trap culture in maize resulted in longer shoots and roots than sudangrass plants. Increase in dry weight with higher percentage also was observed for maize plants. After first and second plant cycle, maize plants had the higher percentage of mycorrhizal response in terms of colonization and arbuscules than sudangrass. Maximum in spore count also achieved in the pots of maize plants. The results show that maize plant is more suitable host plant for AMF spore propagation and trap culture technique can be used effectively to maintain the AMF culture for long time.
김용헌 ( Md Abdul Halim ),사동민 ( Mak Chanratana ),( Shamim Ahmed ),( Yongheon Kim ),( Tongmin Sa ) 한국환경농학회 2017 한국환경농학회 학술대회집 Vol.2017 No.-
Successful colonization of bio-inoculants face hostile environmental conditions like salinity in the rhizosphere of plant. The survivability and adaptation under stress is a major concern for bio-inoculants. Thus, the current study were focused on survivability improvement of the chitosan aggregated Methylobacterium oryzae CBMB20 and pant growth promotion (PGP) of tomato plant under salt stress. At different temperature (4, 30, 40 and 50℃) the capability of the bio-inoculant with either liquid or chitosan based formulation was observed for 3 months of storage and used to examine the effect on tomato plant under salt stress. Furthermore, the poly-β-hydroxybuterate (PHB) content, exopolysaccharide (EPS) production, biofilm formation, and microbial cell hydrophobicity as physiological parameter were studied. It was revealed that the aggregated exposed statistically significant over non-aggregated bioinoculants. In addition, to tolerate UV, heat, desiccation, low temperature, starvation, and H2O2 potentiality were higher for the aggregated M. oryzae CBMB20 than other. Particularly, chitosan immobilized aggregated M. oryzae CBMB20 exhibit 4 to 30℃ optimum storage temperature and 24.67, 36.65 and 59.53% reduction in cfu counts after 90 days of storage at temperatures 4, 30 and 40℃), respectively. Moreover, chitosan immobilized aggregated M. oryzae CBMB20 evinced by 1.9, 1.6 and 1.9-times seed germination, seedling vigor index and plant dry weight, consequently under salt. Hence, chitosan boost the lodging the aggregated bacterial cells that prompt the bio-inoculants survivability and salt stress adeptness in the rhizosphere which leads the growth and development of tomato plant.
Halotolerant Plant Growth Promoting Bacteria Mediated Salinity Stress Amelioration in Plants
Wansik Shin,Ashaduzzaman Siddikee,Manoharan Melvin Joe,Abitha Benson,Kiyoon Kim,Gopal Selvakumar,Yeongyeong Kang,Seonyoung Jeon,Sandipan Samaddar,Poulami Chatterjee,Denver Walitang,Mak Chanratana,Tong 한국토양비료학회 2016 한국토양비료학회지 Vol.49 No.4
Soil salinization refers to the buildup of salts in soil to a level toxic to plants. The major factors that contribute to soil salinity are the quality, the amount and the type of irrigation water used. The presented review discusses the different sources and causes of soil salinity. The effect of soil salinity on biological processes of plants is also discussed in detail. This is followed by a debate on the influence of salt on the nutrient uptake and growth of plants. Salinity decreases the soil osmotic potential and hinders water uptake by the plants. Soil salinity affects the plants K uptake, which plays a critical role in plant metabolism due to the high concentration of soluble sodium (Na<SUP>+</SUP>) ions. Visual symptoms that appear in the plants as a result of salinity include stunted plant growth, marginal leaf necrosis and fruit distortions. Different strategies to ameliorate salt stress globally include breeding of salt tolerant cultivars, irrigation to leach excessive salt to improve soil physical and chemical properties. As part of an ecofriendly means to alleviate salt stress and an increasing considerable attention on this area, the review then focuses on the different plant growth promoting bacteria (PGPB) mediated mechanisms with a special emphasis on ACC deaminase producing bacteria. The various strategies adopted by PGPB to alleviate various stresses in plants include the production of different osmolytes, stress related phytohormones and production of molecules related to stress signaling such as bacterial 1-aminocyclopropane-1-carboxylate(ACC) derivatives. The use of PGPB with ACC deaminase producing trait could be effective in promoting plant growth in agricultural areas affected by different stresses including salt stress. Finally, the review ends with a discussion on the various PGPB activities and the potentiality of facultative halophilic/halotolerant PGPB in alleviating salt stress.