Browsing by Author "U.B. Singh"

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Arthrobotrys oligospora-mediated biological control of diseases of tomato (Lycopersicon esculentum Mill.) caused by Meloidogyne incognita and Rhizoctonia solani
(2013) U.B. Singh; A. Sahu; N. Sahu; R.K. Singh; S. Renu; D.P. Singh; M.C. Manna; B.K. Sarma; H.B. Singh; K.P. Singh
Aims: To study the biocontrol potential of nematode-trapping fungus Arthrobotrys oligospora in protecting tomato (Lycopersicon esculentum Mill.) against Meloidogyne incognita and Rhizoctonia solani under greenhouse and field conditions. Methods and Results: Five isolates of the nematode-trapping fungus Arthrobotrys oligospora isolated from different parts of India were tested against Meloidogyne incognita and Rhizoctonia solani in tomato (Lycopersicon esculentum Mill.) plants grown under greenhouse and field conditions. Arthrobotrys oligospora-treated plants showed enhanced growth in terms of shoot and root length and biomass, chlorophyll and total phenolic content and high phenylalanine ammonia lyase activity in comparison with M. incognita- and R. solani-inoculated plants. Biochemical profiling when correlated with disease severity and intensity in A. oligospora-treated and untreated plants indicate that A. oligospora VNS-1 offered significant disease reduction in terms of number of root galls, seedling mortality, lesion length, disease index, better plant growth and fruit yield as compared to M. incognita- and R. solani-challenged plants. Conclusion: The result established that A. oligospora VNS-1 has the potential to provide bioprotection agents against M. incognita and R. solani. Significance and Impact of the Study: Arthrobotrys oligospora can be a better environment friendly option and can be incorporated in the integrated disease management module of crop protection. Application of A. oligospora not only helps in the control of nematodes but also increases plant growth and enhances nutritional value of tomato fruits. Thus, it proves to be an excellent biocontrol as well as plant growth promoting agent. © 2012 The Society for Applied Microbiology.
Microalgal based biostimulants as alleviator of biotic and abiotic stresses in crop plants
(Elsevier, 2022) Sumit Kumar; Tulasi Korra; U.B. Singh; Shailendra Singh; Kartikay Bisen
Microalgae or microphytes are microscopic, unicellular organisms present in maritime and freshwater, capable for photosynthesis and produce approximately half of the atmospheric oxygen. Microalgae are gaining the attention of plant growers, agrochemicals businesses and scientists, because they have multifaceted biostimulants properties. Microalgal biostimulants (MBS) have been used in crop plants to enhance crop performance and improved agricultural sustainability. MBS are currently being used in various economically important crop plants by different applications methods like seed priming, foliar application and soil amendment. Application of MBS leads to multiple benefits including improve soil water use efficiency, reinforced rooting system, boost crop quality and mitigation of biotic and abiotic stresses like drought and salt. Microalgal biostimulants are environment friendly, beneficial for ecosystem and reduce the hazardous impact of synthetic chemicals on human, animal and plants health. MBS have multiple strategies to suppression of stresses by the production of phytohormone like compounds. In this chapter, role of microalgal biostimulants emphasizing on stress alleviation activities in plants will be discussed. It would surely helpful to understand plant- microalgal interaction. MBS are unexploited for wide adaptable used in agriculture globally, such study provides deep perception and highlights of the current researches and next generation development priorities. © 2022 Elsevier Inc. All rights reserved.
Neuroticism-extraversion as correlates of accident occurence
(1980) D.M. Pestonjee; U.B. Singh
This study attempts to examine empirically the personality dimensions of neutroticism-extraversion as correlates of road accidents. The study was carried out on two groups each consisting of 20 drivers. The first group was called non-accident group (NAG) and the second as accident group (AG). For purposes of further intensive analysis the AG was divided into two more groups-the single-accident group (SAG) and multi-accident group (MAG) having 14 and 6 drivers as sample units respectively. An Indian adaptation of Eysenck's Maudsley Personality Inventory was used to assess the neuroticism and extraversion dimensions of personality. Statistically significant differences were observed for NAG vs MAG and SAG vs MAG drivers on extraversion dimension but the differences were not significant in the case of other groups on this dimension. No differences were observed in case of the neuroticism dimension. © 1980, All rights reserved.