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Asaf, Sajjad,Khan, Abdul Latif,Khan, Muhammad Aaqil,Al-Harrasi, Ahmed,Lee, In-Jung Springer International Publishing 2018 3 Biotech Vol.8 No.9
<P>Our study aimed to elucidate the plant growth-promoting characteristics and the structure and composition of <I>Sphingomonas</I> sp. LK11 genome using the single molecule real-time (SMRT) sequencing technology of Pacific Biosciences. The results revealed that LK11 produces different types of gibberellins (GAs) in pure culture and significantly improves soybean plant growth by influencing endogenous GAs compared with non-inoculated control plants. Detailed genomic analyses revealed that the <I>Sphingomonas</I> sp. LK11 genome consists of a circular chromosome (3.78 Mbp; 66.2% G+C content) and two circular plasmids (122,975 bps and 34,160 bps; 63 and 65% G+C content, respectively). Annotation showed that the LK11 genome consists of 3656 protein-coding genes, 59 tRNAs, and 4 complete rRNA operons. Functional analyses predicted that LK11 encodes genes for phosphate solubilization and nitrate/nitrite ammonification, which are beneficial for promoting plant growth. Genes for production of catalases, superoxide dismutase, and peroxidases that confer resistance to oxidative stress in plants were also identified in LK11. Moreover, genes for trehalose and glycine betaine biosynthesis were also found in LK11 genome. Similarly, <I>Sphingomonas</I> spp. analysis revealed an open pan-genome and a total of 8507 genes were identified in the <I>Sphingomonas</I> spp. pan-genome and about 1356 orthologous genes were found to comprise the core genome. However, the number of genomes analyzed was not enough to describe complete gene sets. Our findings indicated that the genetic makeup of <I>Sphingomonas</I> sp. LK11 can be utilized as an eco-friendly bioresource for cleaning contaminated sites and promoting growth of plants confronted with environmental perturbations.</P><P><B>Electronic supplementary material</B></P><P>The online version of this article (10.1007/s13205-018-1403-z) contains supplementary material, which is available to authorized users.</P>
Asaf, S.,Khan, A.L.,Khan, M.A.,Imran, Q.M.,Yun, B.W.,Lee, I.J. GUSTAV FISCHER VERLAG JENA GMBH 2017 MICROBIOLOGICAL RESEARCH Vol.205 No.-
<P>Osmotic stress induced by drought can hinder the growth and yield of crop plants. To understand the eco-physiological role of osmoprotectants, the combined utilization of endophytes and osmolytes (trehalose) can be an ideal strategy used to overcome the adverse effects of drought. Hence, in the present study, we aimed to investigate the role of Sphingomonas sp. LK11, which produces phytohormones and synthesizes trehalose, in improving soybean plant growth under drought-induced osmotic stress (-0.4, -0.9, and -1:2 MPa). The results showed that the inoculation of soybean plants with Sphingomonas sp. LK11 significantly increased plant length, dry biomass, photosynthetic pigments, glutathione, amino acids (proline, glycine, and glutamate), and primary sugars as compared to control plants under varying drought stresses. Trehalose applied to the plant with or without endophyte-inoculation also showed similar plant growth-promoting attributes under stress. Stress exposure significantly enhanced endogenous jasmonic (JA) and abscisic (ABA) acid contents in control plants. In contrast, Sphingomonas sp. LK11-inoculation significantly lowered ABA and JA levels in soybean plants, but these phytohormones increased in response to combined treatments during stress. The drought-induced osmotic stress resistance associated with Sphingomonas sp. LK11 and trehalose was also evidenced by increased mRNA gene expression of soybean dehydration responsive element binding protein (DREB)-type transcription factors (GmDREBa and GmDREB2) and the MYB (myeloblastosis) transcription factor (GmMYBJ1) as compared to the control. In conclusion, our findings demonstrated that inoculation with this endophyte and trehalose improved the negative effects of drought-induced osmotic stress, and it enhanced soybean plant growth and tolerance.</P>
Convergence of service and technical skills: the case of ERP implementation in Israel
Asaf Darr 기술경영경제학회 2015 ASIAN JOURNAL OF TECHNOLOGY INNOVATION Vol.23 No.-
This empirical study points to the rise of the techno-service sector of the economy, andquestions the analytical distinction between technical and social skills, a distinction whichunderpins governments’ and economic institutions’ attempts to measure and quantify typesof skills and the complexity of different lines of work. By focusing on Enterprise ResourcePlanning (ERP) implementers, this study points to the growing interdependency and to theconvergence of service and technical skills in the techno-service sector. The paper alsoprovides empirical indication of the growing penetration of professional work into the heartof the industrial enterprise.
Asaf, Sajjad,Khan, Muhammad Aaqil,Khan, Abdul Latif,Waqas, Muhammad,Shahzad, Raheem,Kim, Ah-Yeong,Kang, Sang-Mo,Lee, In-Jung Informa UK (TaylorFrancis) 2017 Journal of plant interactions Vol.12 No.1
<P>The objective of the present study was to determine the potential plant growth-promoting action of bacterial endophytes isolated from arid land-dwelling plants under normal conditions. Overall, five bacterial endophytes LK11 (Sphingomonas sp. LK11), TP5 (Bacillus subtilis), MPB5.3 (B. subtilis subsp. Subtilis), S9 (B. subtilis subsp. Subtilis), and TP1 (Serratia marcescens) were evaluated based on morphological characteristics after isolation and purification. Phytohormonal analysis of these endophytes predicted indole acetic acid (IAA) production 12.31 +/- 0.45, 6.8 +/- 0.59, and 10.5 +/- 1.02 mu M/mL in the culture broths of LK11, MPB5.3, and TP1, respectively. Under controlled greenhouse conditions, these endophytes were inoculated into soybean, and their growth-promoting characteristics were compared with those of non-phytohormone-producing endophytes. In terms of plant growth promotion, among IAA-producing endophytes, LK11 and TP1 greatly improved physiological characteristics such as shoot/root length, fresh/dry weight, and chlorophyll contents. However, the non-phytohormone-producing endophytes TP5 and S9 did not show a growth-promoting effect. Based on these results, plants inoculated with LK11 and TP1 along with a control were subjected to endogenous hormonal analysis and showed a significant increase in abscisic acid (457.30-398.55 vs. 205.93 ng/g D.W.) and a decrease in jasmonic acid content (50.07-85.07 vs. 93.90 ng/g D.W.), respectively. Total gibberellin content was found to significantly increase in endophyte-inoculated plants (155.43-146.94 ng/g D.W.) as compared to that in controls (113.76 ng/g D.W.). In summary, bacterial endophytes might be used to enhance crop plant physiological characteristics isolated from arid land-inhabiting plants under normal conditions.</P>
Kang, S.M.,Asaf, S.,Kim, S.J.,Yun, B.W.,Lee, I.J. Elsevier Science Publishers 2016 Journal of biotechnology Vol.239 No.-
<P>Leifsonia xyli SE134 is a potential plant growth-promoting bacterium isolated from a soil in Daegu, Republic of Korea, which produces large amounts of gibberellin (GA) and indole acetic acid (IAA). In this study, we sequenced the complete genome of L. xyli SE134 by the Pacific Biosciences RSII (PacBio) Single Molecule Real Time (SMRT) sequencing technology. The genome of L. xyli SE134 contains a single chromosome that is 3,596,761 bp in length, with 70.2% G + C content. The genome contains 3466 protein coding genes (CDSs) and 51 rRNA-and 46 tRNA-coding genes. By genomic analysis, we identified genes that are potentially involved in plant growth promotion such as genes participating in indole-3-acetic acid (IAA) biosynthesis, siderophore, and trehalose production. L. xyli SE134 also harbours genes for central carbohydrate metabolism, indicating that it can utilise the root exudates with other organic materials as an energy source. Furthermore, the SE134 genome is equipped with various kinds of genes for adaptation to plant surfaces, e.g. defence against desiccation, nutrient deficiencies, and oxidative stress, and a large proportion of genes related to secretion mechanisms and signalling. The genetic information provided here may help to expand this bacterium's biotechnological potential and to further improve its plant growth promoting characteristics. (C) 2016 Elsevier B.V. All rights reserved.</P>