First report of Pythium recalcitrans infecting flue-cured tobacco

Abstract

In July 2014, an unknown Pythium sp. was isolated from the rhizosphere soil of flue-cured tobacco (Nicotiana tabacum) in Luoyang of China. Based on morphological characteristics and phylogenetic analysis of Inter Transcribed Spacer sequences, the pathogen was identified as Pythium recalcitrans Moralejo. The result of the pathogenicity test showed that Pythium recalcitrans could infect the seedlings of flue-cured tobacco.Keywords Pythium recalcitrans . Flue-cured tobacco . Pathogenicity Luoyang is a high quality tobacco production area in China. It belongs to the warm temperate continental monsoon climate, therefore having four distinct seasons. It experiences a large temperature difference annually with long hours of sunshine in the summer months. It is characterised with varied topography including hills, mountains and numerous rivers. Each year, nearly 20 000 ha of flue-cured tobacco are planted in hilly land. However, the diseases of flue-cured tobacco, caused by the lack of good cultivation management greatly influence the quality of flue-cured tobacco.

Synthesis of 3,4-dihydroisoquinolin-1(2H)-one derivatives and their antioomycete activity against the phytopathogen Pythium recalcitrans

“…It is noteworthy that the oomycete P. recalcitrans is a soil-borne phytopathogen with a wide host-range, such as tobacco, 31 soybean, 32 corn, 33 alfalfa, 34 grape, beet 35 and carrot, 36 causing seed decay, seedling collapse and root rot, cavity spot, and significantly reducing crop yield. Due to its easy recovery profile from flooding soil 37 and insensitivity to many commercial fungicides, 33,36 there is a need for exploring effective antioomycete agents to control this pathogen.…”