Core Microbiome. Группа авторов

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Grevillea pteridifolia Streptomyces sp. Castillo et al. (2003) Coronamycins Antimycotic, antiplasmodial Monstera sp. Streptomyces sp. Ezra et al. (2004)

      3.7 Biological Control and Plant Improvement

      Plant–microbe interaction proves to have increased plant growth directly by stimulating nutrient availability or hormonal production or indirectly by suppressing plant pathogens. Many rhizobacteria strains, such as Bacillus group, Taphylococcus, and Burkholderia cepacian, promote plant growth. These strains also produced volatile organic compounds (VOCs) that enhance growth (Bitas et al. 2013). Biosurfactants, VOCs, antibiotics, and enzymes are used to suppress the growth of pathogens (Berg et al. 2010). Plant extract with antifungal activity is used to suppress pathogens and increase the growth of medicinal plants. Medicinal plants effectively control the development of diseases caused by Macrophomina phaseolina. It is also reported that medicinal plants exhibited varying degrees of inhibition activity against M. phaseolina. Different concentrations of Cleome viscose, Hyptis sueolences, Grewia arborea, Avicennia officinalis, Ocimum, Tephrosia villosa, Peltophorum pterophorus, Sesbanian grandiflora, and Terminalia chebula showed high activity with strong antifungal activity against M. phaseolina, while chloroform extracts showed very low activity (Bobbarala et al. 2009).

      3.8 Management Strategies to Alleviate Abiotic Stress in Medicinal Plants

      Various bacterial genera can promote plant growth and are known as plant growth-promoting rhizobacteria (PGPR). Moreover, scavenging of ROS, the compatible solutes, and accumulation of antioxidant metabolites are induced signals for important transcriptional modulation activities under heat stress (Wahid et al. 2007). Most endophytic actinomycetes belong to the genus Streptomyces, which is responsible for about 80% of biologically active compounds. Actinomycetes protect medicinal plants by reducing the growth of fungal pathogens with chitinases acting as inhibitors of fungal growth. The use of endophytic actinomycetes for controlling S. rolfsii offer an eco-friendly environment and disease management (Nagpure et al. 2014). IAA has a role in stem elongation and root growth. The IAA value is high in the rhizosphere, where rhizosphere bacteria produce auxin as secondary metabolites because of rich supplies of root exudates. It also triggers the propagation of lateral roots that increase the nutrients-absorbing area, which leads to better assimilation of water and nutrients from the surroundings.

      Actinobacteria also produce IAA, cytokinin’s and gibberellic acid. Aspergillus and Streptomyces produce a high level of IAA, which leads to the production of hematophagous actinomycetes (Ruanpanun et al. 2010). The application of rhizobacteria improves plant growth as well as soil microbial activity (Karami et al. 2010). With nourishment from microbes in the stress environment and adaptable response at the phenotypic level, it is always appropriate to implement microbe-derived natural products that can perform a good job to alleviate stress regardless of environmental conditions.

      3.9 Conclusion and Future Consensus

      References

      1 Abbaszadeh, B., Valadabadi, H.A.F.S.A., and Moaveni, P. (2009). Investigation of variations of the morphological values and flowering shoot yield in different mint species at Iran. Journal of Horticulture and Forestry 1 (7): 109–112.

      2 Abdou, R., Scherlach, K., Dahse, H.-M., Sattler, I., and Hertweck, C. (2010). Botryorhodines A–D, antifungal and cytotoxic depsidones from Botryosphaeria rhodina, an endophyte of the medicinal plant Bidens Pilosa. Phytochemistry 71 (1): 110–116.

      3 Ahmad, P., Hashem, A., Abd-Allah, E.F., Alqarawi, A.A., John, R., Egamberdieva, D., and Gucel, S. (2015). Role of Trichoderma harzianum in mitigating NaCl stress in Indian mustard (Brassica juncea L) through antioxidative defense system. Frontiers in Plant Science 6: 868.

      4 Ait Barka, E., Nowak, J., and Clément, C. (2006). Enhancement of chilling resistance of inoculated grapevine plantlets with a plant growth-promoting rhizobacterium, Burkholderia phytofirmans strain PsJN. Applied and Environmental Microbiology 72 (11): 7246–7252.

      5 Ali, M.B., Hahn, E.-J., and Paek, K.-Y. (2005). Effects of temperature on oxidative stress defense systems, lipid peroxidation and lipoxygenase activity in Phalaenopsis. Plant Physiology and Biochemistry 43 (3): 213–223.

      6 Ali, R.M., Abbas, H.M., and Kamal, R.K. (2007). The effects of treatment with polyamines on dry matter, oil and flavonoid contents in salinity stressed chamomile and Sweet Marjoram. Plant Soil and Environment 53 (12): 529.

      7 Aziz, E.E. and Hendawy, S.F. (2008). Effect of soil

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