A new species of Aspergillus niger (KNU12-3-3) has been isolated from insect specimen in Korea. T... more A new species of Aspergillus niger (KNU12-3-3) has been isolated from insect specimen in Korea. This strain was isolated from Pectocera fortunei. The identification was based on the morphological characteristics and ITS analysis. This is the first report of a new species of A. niger isolated from insects in Korea.
Diseased rice plants with foot rot as well as dark brown lesions on sheaths and stems were observ... more Diseased rice plants with foot rot as well as dark brown lesions on sheaths and stems were observed in a paddy field in Mazandaran province, Iran. Single lesions were excised and surface sterilized and then plated on water agar. The arising fungi were purified and refrigerated in agar slants. On the basis of morphological characteristics the fungus was identified as Bipolaris sorokiniana. The ITS sequence of the fungus was submitted to a BLAST search to find most similar sequences in GenBank. The search results showed highest similarity to eight strains of B. sorokiniana and Cochliobolus sativus (teleomorph). For phylogenetic comparison, the sequences of Bipolaris spp., Cochliobolus spp. together with other species belonging to closely related fungal genera were included. The resulted phylogram made with the neighbor-joining method using the program PAUP, showed that the Iranian strain (B54) formed a monophyletic group with seven B. sorokiniana and one C. sativus strain. To prove pa...
Communications in agricultural and applied biological sciences, 2003
Sheath rot of rice occurs in most rice-growing regions of the world. It usually causes yield loss... more Sheath rot of rice occurs in most rice-growing regions of the world. It usually causes yield losses from 20 to 85%. Sheath rot was reported from Iran in 1993. Year after year, the number of diseased plants increased in the Northern Iran. In summer of 2001, these symptoms were observed in most fields: lesions occur on the upper leaf sheaths, especially the flag leaf sheath. As the disease progresses, lesions enlarge and coalesce and may cover most of the leaf sheath. Panicle may fail to completely or at all. Brown or partially brown not filled or partially filled grain is also associated with infection of the panicle. A whitish powdery growth may be found inside affected sheaths. Infected plants were collected and trasferred to laboratory. Small pieces of diseased tissues were washed under tap water for one hour. Then tissues were placed on WA and incubated at 25 degrees C. These isolates were purified and identified as: Sarocladium oryzae, Fusarium udum, F. semitectum, F. avenaceum,...
(English) Panicle discoloration is a complex disease and its main causal agents are fungi and bac... more (English) Panicle discoloration is a complex disease and its main causal agents are fungi and bacteria. In field survey, disease symptoms were observed as panicle discoloration, palea browning, sterility of seed on panicles and low seed quality. Rainfall ...
A new species of Aspergillus niger (KNU12-3-3) has been isolated from insect specimen in Korea. T... more A new species of Aspergillus niger (KNU12-3-3) has been isolated from insect specimen in Korea. This strain was isolated from Pectocera fortunei. The identification was based on the morphological characteristics and ITS analysis. This is the first report of a new species of A. niger isolated from insects in Korea.
Diseased rice plants with foot rot as well as dark brown lesions on sheaths and stems were observ... more Diseased rice plants with foot rot as well as dark brown lesions on sheaths and stems were observed in a paddy field in Mazandaran province, Iran. Single lesions were excised and surface sterilized and then plated on water agar. The arising fungi were purified and refrigerated in agar slants. On the basis of morphological characteristics the fungus was identified as Bipolaris sorokiniana. The ITS sequence of the fungus was submitted to a BLAST search to find most similar sequences in GenBank. The search results showed highest similarity to eight strains of B. sorokiniana and Cochliobolus sativus (teleomorph). For phylogenetic comparison, the sequences of Bipolaris spp., Cochliobolus spp. together with other species belonging to closely related fungal genera were included. The resulted phylogram made with the neighbor-joining method using the program PAUP, showed that the Iranian strain (B54) formed a monophyletic group with seven B. sorokiniana and one C. sativus strain. To prove pa...
Communications in agricultural and applied biological sciences, 2003
Sheath rot of rice occurs in most rice-growing regions of the world. It usually causes yield loss... more Sheath rot of rice occurs in most rice-growing regions of the world. It usually causes yield losses from 20 to 85%. Sheath rot was reported from Iran in 1993. Year after year, the number of diseased plants increased in the Northern Iran. In summer of 2001, these symptoms were observed in most fields: lesions occur on the upper leaf sheaths, especially the flag leaf sheath. As the disease progresses, lesions enlarge and coalesce and may cover most of the leaf sheath. Panicle may fail to completely or at all. Brown or partially brown not filled or partially filled grain is also associated with infection of the panicle. A whitish powdery growth may be found inside affected sheaths. Infected plants were collected and trasferred to laboratory. Small pieces of diseased tissues were washed under tap water for one hour. Then tissues were placed on WA and incubated at 25 degrees C. These isolates were purified and identified as: Sarocladium oryzae, Fusarium udum, F. semitectum, F. avenaceum,...
(English) Panicle discoloration is a complex disease and its main causal agents are fungi and bac... more (English) Panicle discoloration is a complex disease and its main causal agents are fungi and bacteria. In field survey, disease symptoms were observed as panicle discoloration, palea browning, sterility of seed on panicles and low seed quality. Rainfall ...
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