Pathogenicity of cutinase- and pectic enzymes-deficient mutants of Alternaria alternata Japanese pear pathotype.

1988 ◽  
Vol 54 (4) ◽  
pp. 552-555 ◽  
Author(s):  
Kentaro TANABE ◽  
Syoyo NISHIMURA ◽  
Keisuke KOHMOTO
Keyword(s):  
Alternaria Alternata ◽  
Japanese Pear ◽  
Pectic Enzymes

scholarly journals Distribution and Characterization of AKT Homologs in the Tangerine Pathotype of Alternaria alternata

2000 ◽  
Vol 90 (7) ◽  
pp. 762-768 ◽  
Author(s):  
A. Masunaka ◽  
A. Tanaka ◽  
T. Tsuge ◽  
T. L. Peever ◽  
L. W. Timmer ◽  
...  
Keyword(s):  
Alternaria Alternata ◽  
Sequence Similarity ◽  
Structural Similarity ◽  
Toxin Production ◽  
Brown Spot ◽  
Japanese Pear ◽  
Black Rot ◽  
Acid Moiety ◽  
High Sequence Similarity ◽  
Rough Lemon

The tangerine pathotype of Alternaria alternata produces a host-selective toxin (HST), known as ACT-toxin, and causes Alternaria brown spot disease of citrus. The structure of ACT-toxin is closely related to AK- and AF-toxins, which are HSTs produced by the Japanese pear and strawberry pathotypes of A. alternata, respectively. AC-, AK-, and AF-toxins are chemically similar and share a 9,10-epoxy-8-hydroxy-9-methyl-decatrienoic acid moiety. Two genes controlling AK-toxin biosynthesis (AKT1 and AKT2) were recently cloned from the Japanese pear pathotype of A. alternata. Portions of these genes were used as heterologous probes in Southern blots, that detected homologs in 13 isolates of A. alternata tangerine pathotype from Minneola tangelo in Florida. Partial sequencing of the homologs in one of these isolates demonstrated high sequence similarity to AKT1 (89.8%) and to AKT2 (90.7%). AKT homologs were not detected in nine isolates of A. alternata from rough lemon, six isolates of nonpathogenic A. alternata, and one isolate of A. citri that causes citrus black rot. The presence of homologs in the Minneola isolates and not in the rough lemon isolates, nonpathogens or black rot isolates, correlates perfectly to pathogenicity on Iyo tangerine and ACT-toxin production. Functionality of the homologs was demonstrated by detection of transcripts using reverse transcription-polymerase chain reaction (RT-PCR) in total RNA of the tangerine pathotype of A. alternata. The high sequence similarity of AKT and AKT homologs in the tangerine patho-type, combined with the structural similarity of AK-toxin and ACT-toxin, may indicate that these homologs are involved in the biosynthesis of the decatrienoic acid moiety of ACT-toxin.

The presence of double-stranded RNAs in Alternaria alternata Japanese pear pathotype is associated with morphological changes

2011 ◽  
Vol 77 (4) ◽  
pp. 248-252 ◽  
Author(s):  
Kuko Fuke ◽  
Kana Takeshita ◽  
Nanako Aoki ◽  
Toshiyuki Fukuhara ◽  
Mayumi Egusa ◽  
...  
Keyword(s):  
Alternaria Alternata ◽  
Morphological Changes ◽  
Japanese Pear

scholarly journals Comparison of Parasitic Fitness between Two Pathotypes of Alternaria alternata to Japanese Pear.

1992 ◽  
Vol 58 (5) ◽  
pp. 734-740 ◽  
Author(s):  
Noriki HAYASHI ◽  
Mikihiro YAMAMOTO ◽  
Takashi TSUGE ◽  
Syoyo NISHIMURA
Keyword(s):  
Alternaria Alternata ◽  
Japanese Pear ◽  
Parasitic Fitness

scholarly journals Light-induced insensitivity of apple and Japanese pear leaves to AM-toxin from Alternaria alternata apple pathotype.

1989 ◽  
Vol 55 (5) ◽  
pp. 567-578 ◽  
Author(s):  
Hiroki TABIRA ◽  
Hiroshi OTANI ◽  
Norihiro SHIMOMURA ◽  
Motoichiro KODAMA ◽  
Keisuke KOHMOTO ◽  
...  
Keyword(s):  
Alternaria Alternata ◽  
Japanese Pear

scholarly journals Characterization of the Mutants of Alternaria alternata Japanese Pear Pathotype Deficient in Melanin Production and Their Pathogenicity.

1995 ◽  
Vol 61 (1) ◽  
pp. 27-33 ◽  
Author(s):  
Kentaro TANABE ◽  
Pyoyun PARK ◽  
Takashi TSUGE ◽  
Keisuke KOHMOTO ◽  
Syoyo NISHIMURA
Keyword(s):  
Alternaria Alternata ◽  
Japanese Pear ◽  
Melanin Production

Detection of fungi producing infection-inhibiting metabolites against Alternaria alternata Japanese pear pathotype from fungi inhabiting internal tissues of Japanese pear shoots

2004 ◽  
Vol 70 (2) ◽  
pp. 139-142 ◽  
Author(s):  
Evelyn Aigho Aremu ◽  
Koichi Tanaka ◽  
Yasunori Akagi ◽  
Nitaro Maekawa ◽  
Hajime Akamatsu ◽  
...  
Keyword(s):  
Alternaria Alternata ◽  
Japanese Pear
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