ArticleScientific reports2025
Efficacy of ascorbic acid, citric acid and Thevetia sp. extract against Agrobacterium tumefaciens and Meloidogyne incognita infecting guava.
Article in Scientific reports, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
The efficiency of some organic acids (ascorbic and citric acids) and methanolic extract of Thevetia sp. were investigated against crown gall bacterium (Agrobacterium tumefaciens) and the root-knot nematode (Meloidogyne incognita) under in vitro and pot trails. Two isolates (Ag1 and Ag2) of crown gall bacteria were used in this study. The isolate Ag2 was identified molecularly by PCR using universal primers for 16 S rRNA. The PCR products' DNA sequence, BLAST analysis and Genbank data revealed that the Ag2 isolate belonged to A. tumefaciens. According to the phylogenetic tree based on the DNA nucleotide sequences of the 16 S rRNA gene, the Egyptian isolate is closely similar to the Indian isolate (PP218089). The analysis of Thevetia sp. methanolic extract exhibited that 35 phytochemical components were identified by using GC-MS. Under in vitro conditions, ascorbic acid at 6.4% was the most effective against A. tumefaciens (Ag2 isolate) recording inhibition zone of 38.3 mm with disc diffusion method and 100% inhibition with MIC method at 1.00 g/l. However, Thevetia sp. extract was the most effective against 2nd stage juveniles of M. incognita after 48 h of exposure with values of 0.478 g/l (LC
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