Browsing by Author "V. Manoj Kumar"

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Core microbiome: Plant growth and development
(wiley, 2022) P. Thirunarayanan; Uday Kumar Thera; Tulasi Korra; V. Manoj Kumar
Many scholars have recognized the benefits of microbes around legume crops and their assistance in the inoculation and development of nodules on their lateral roots. It is a fine-tuned reduction process that converts N2 NH3. Nod factors are a product of Rhizobium spp., which play a vital role in the development of root nodules. Moving to secondary signals like phytohormones will trigger secondary metabolites in roots. These signals fix the symbiotic association and promote nutrients uptake, such as nitrogen and phosphorus and resist biotic and abiotic stresses. However, different signaling pathways can be established for legume-root nodulation. Nodulation genes are helpful in the regulation of proper plant growth and development. Biofertilizers support in the mobilization of nutrients for plant growth and farmers ought to be encouraged in using them to create low environmental impact under the global climate change scenario. © 2022 John Wiley & Sons Ltd. All rights reserved.
Exploration of indigenous strains of the green muscardine fungus from soils and their pathogenicity against the tobacco caterpillar, Spodoptera litura (Fabricius) (Lepidoptera: Noctuidae)
(Springer, 2020) R. Dhanapal; D. V. Sai Ram Kumar; R. Lakshmipathy; C. Sandhya Rani; V. Manoj Kumar
In the recent years, the keen interest has been increased towards biological control-based management practices using entomopathogenic fungi (EPF) for the control of many economically important insects. In this management practices, selection of right strains of EPF is an important criteria to control the target pests in effective manner. In this context, this research work was formulated to find out environmentally effective strains of EPF in the soils of costal districts of Andhra Pradesh. Out of 135 soil samples collected, 8 soil samples yielded 8 strains of Metarhizium anisopliae. Among all 8 M. anisopliae isolates, the least median lethal concentration (LC50) for 2nd instar of the tobacco caterpillar, Spodoptera litura (Lepidoptera: Noctuidae) was 1.24 × 105 spores ml-1 in M-7, followed by 1.72 × 105 spores ml-1 in M-5 and 1.86 × 105 spores ml-1 in M-4 in an increasing order. Likewise, the median lethal time (LT50) values of different isolates of EPF against 2nd instar of S.litura were calculated for a uniform highest dose of 1 × 108 spores ml−1. Among all 8 M. anisopliae isolates, the lowest LT50 was observed as 186.44 hours post infection (hpi) with M-5 and 189.34 hpi with M-7. © 2020, The Author(s).
Isolation of indigenous strains of the white halo fungus as a biological control agent against 3rd instar larvae of tobacco caterpillar, Spodoptera litura (Fabricius) (Lepidoptera: Noctuidae)
(Springer, 2020) R. Dhanapal; D. V. Sai Ram Kumar; R. Lakshmipathy; C. Sandhya Rani; V. Manoj Kumar
The farmer interest in biological control-based management practices using entomopathogenic fungi (EPF) for the control of many economically important insects has increased. In this process, selection of effective strains of EPF is an important criterion to control the target insect pests in efficient manner. In this context, this research work was formulated to find out environmentally effective strains of EPF in the soils of costal districts of Andhra Pradesh, India. Out of 135 soil samples collected, 9 yielded 9 strains of Lecanicillium lecanii. Among all 9 L. lecanii isolates, the least median lethal concentration (LC50) for 3rd instar larvae of the tobacco caterpillar, Spodoptera litura (Fabricius) (Lepidoptera: Noctuidae), was 1.17 × 106 spores ml−1 in L-8, followed by 1.27 × 106 spores ml−1 in L-5 in an increasing order. Likewise, the median lethal time (LT50) values of different isolates of EPF against the 3rd instar of S. litura were calculated for the uniform highest concentration of 1 × 108 spores ml−1. Among all 9 L. lecanii isolates, the lowest median lethal time (LT50) was observed as 7.70 days by L-8, followed by 7.77 days by L-5 and 8.50 days by L-7. © 2020, The Author(s).