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- Title
CURRENT STATUS AND FUTURE PERSPECTIVES IN ROMANIA ON BIOLOGICAL CONTROL OF SWEET POTATO FUNGAL PATHOGEN.
- Authors
BOIU-SICUIA, Oana-Alina; CONSTANTINESCU, Florica; DIACONU, Aurelia; DRAGHICI, Reta
- Abstract
Sweet potato (Ipomoea batatas (L) Lam.) is a less grown vegetable in Romania, mostly due to its growth requirements. This crop demands for warm weather and well-drained soils for its best growth. In Romania, such growth conditions are found in the south area of the country, especially on the sandy soils of the Dolj County. At the Research-Development Station for Field Crops on Sandy Soils (RDSFCSS) - Dabuleni, the sweet potato was successfully acclimatized and established in the crop rotation, mostly due to the pedo-climatic conditions of the area. These vegetables increased crop diversification and ensured a good productivity under the current climate change conditions. In countries were sweet potato is a traditional vegetable, a wide range of plant pathogens is mentioned for this crop. Until now, no major phytosanitary problems have been encountered in Romania, allowing this culture to be successfully introduced into the organic production system. Flowever, some fungal pathogens, like Alternaria spp., Fusarium spp., Botrytis cinerea, Pythium spp., Penicillum spp. and Rhizopus stolonifer, were previously isolated from sweet potato plants and tubers cultivated in SCDCPN - Dabuleni, against which several bacterial antagonists were previously tested. Based on these results, the aim of present study is to analyze the mechanisms by which different biocontrol strains suppress sweet potato pathogens in order to establish the best measures of biological control. The studies were performed in vitro both against pathogenic species encountered for this vegetable in Romania, and against pathogens that are present in our country without infecting sweet potato (Macrophomina phaseolina, Rhizoctonia solani), although they induce economic losses in other country conditions. Fungal disease suppression was found to be related with microbial competitors of plant beneficial bacteria, able to produce lytic enzymes and antibiotic compounds. The studied biocontrol bacterial strains were able to induce, in vitro, mycelial growth inhibition, fungal cells lysis and other alterations of the hyphae.
- Subjects
SWEET potatoes; POTATO growing; PHYTOPATHOGENIC microorganisms; FUNGAL diseases of plants; FOOD crops; TUBERS
- Publication
Oltenia, Studii si Comunicari Seria Stiintele Naturii, 2018, Vol 34, Issue 2, p172
- ISSN
1454-6914
- Publication type
Article