Blackleg risk potential of seed potatoes determined by quantification of tuber contamination by the causal agent and Erwinia carotovora subsp. atroseptica: a critical review

EPPO Bulletin ◽  
2000 ◽  
Vol 30 (3-4) ◽  
pp. 413-420 ◽  
Author(s):  
M. C. M. Pérombelon
2016 ◽  
Vol 1 (1) ◽  
pp. 17
Author(s):  
Titiek Yulianti

<p>Penelitian ini bertujuan untuk memperoleh aksesi tembakau cerutu yang tahan terhadap penyakit lanas dise-babkan oleh patogen <em>Phytophthora nicotianae </em>vßdH var. <em>nicotianae </em>Waterhouse dan busuk batang berlu-bang yang disebabkan oleh patogen <em>Erwinia carotovora</em> sebagai sumber genetik pada persilangan untuk me-rakit varietas unggul baru.<em> </em>Penelitian dilaksanakan di laboratorium dan rumah kasa dan semi lapangan pada <em>polybag</em> di Balai Penelitian Tanaman Tembakau dan Serat, Malang, mulai bulan Maret sampai dengan De-sember 2008. Percobaan disusun dalam rancangan acak kelompok (RAK) dengan tiga ulangan. Unit perlaku-an terdiri dari 10 tanaman tembakau cerutu. Parameter pengamatan adalah persentase tanaman sakit. Ino-kulasi <em>Phytophthora nicotianae </em>pada tanaman dilakukan pada 1 bulan setelah tanam dengan cara membuat luka/sayatan pada pangkal batang kemudian diolesi suspensi patogen dan ditutup dengan kapas steril yang dibasahi dengan air steril untuk menjaga kelembapan. Inokulasi <em>E. carotovora</em> dilakukan pada dua minggu setelah tanam (MST) yaitu pada akar yang disayat terlebih dahulu dengan menggunakan pisau <em>cutter</em> seba-gai media masuknya inokulum pada bagian tanaman. Suspensi inokulum yang digunakan 10 ml dengan ke-rapatan 10<sup>8</sup>/ml per <em>polybag</em>. Dari hasil pengujian diperoleh enam aksesi tembakau cerutu tahan terhadap <em>P. nicotianae</em> yaitu: S-2235, S-2272, S-2361, S-2399, S-2400, dan S-2403. Sedangkan aksesi yang tahan ter-hadap <em>E. carotovora</em> adalah: S-2234, S-2236, S-2271, S-2272, S-2298, S-2299, S-2361, S-2399, S-2400, dan S-2401.</p><p>This study aimed to examine the resistance level of 30 cigar tobacco accessions to <em>Phytophthora nicotianae</em>, the causal agent of black shank, and <em>Erwinia carotovora</em>, the causal agent of hollow stalk. The resistant lines will be used as resistant genetic source in breeding process to construct premium variety (ies). The screen-ing test was conducted in a glass house from March–December 2008 arranging in randomized block design with three replicates. Each unit of tobacco accessions consisted of 10 plants and percentage of wilt/diseased plant assessed to determine the resistant degree. <em>P. nicotianae</em> was inoculated on wounded bottom stem beneath the soil level 1 month after transplanting. Whilst <em>E. carotovora</em> was infested in sterilized soil 10 ml with concentration of 10<sup>8</sup> per polybag two weeks after tobacco seedlings were transplanted. The root sys-tems were wounded to facilitate the bacterium enter the cells. Results of the test show that 6 of 16 tested accessions were resistant, ie. S-2235, S-2272, S-2361, S-2399, S-2400, and S-2403 to <em>P. nicotianae</em>; and 10 accessions were resistant to <em>E. carotovora</em> ie. S-2234, S-2236, S-2271, S-2272, S-2298, S-2299, S-2361, S-2399, S-2400, and S-2401.</p>


1969 ◽  
Vol 74 (1) ◽  
pp. 83-92
Author(s):  
Amelia Cortés-Monllor

The bacterium Erwinia carotovora pv. carotovora (Jones) was identified from bacterial isolates from decaying material of tobacco, tomato, tanier, head lettuce, cabbage, Dracaena spp, Pothos spp, and calla lily as the causal agent of soft rot disease. Physiological characteristics, biochemical reactions and antibiotic response were similar among strains. The ability of the isolates to produce soft rot symptoms on healthy plants when artificially inoculated was demonstrated by pathogenicity tests.


1990 ◽  
Vol 39 (1) ◽  
pp. 125-133 ◽  
Author(s):  
R. A. BAIN ◽  
M. C. M. PÉROMBELON ◽  
L. TSROR ◽  
A. NACHMIAS

1993 ◽  
Vol 2 (4) ◽  
pp. 345-352
Author(s):  
Pirkko Harju ◽  
Jyrki Kankila

Symptomless contamination with the rot-inducing bacterium Erwinia carotovora was detectable by the tuber incubation method in 82% of the commercial seed potato stocks surveyed. E. carotovora subsp. atroseptica (Eca) was more common than E. carotovora subsp. carotovora (Ecc ) among the tuber contaminants. In a four-year survey of ten meristem-based seed stocks, recontamination with both Eca and Ecc occurred typically during the second field generation, but three stocks remained free of detectable contamination throughout the survey period. The first blackleg symptoms occurred typically during the third field generation. The serogroup distribution of Finnish Eca isolates was different from that reported from other countries. The predominant serogroup, I, constituted only 74% of all Eca isolates, since serogroups XXXV and XLI occurred relatively frequently. Serogroup I was more common among isolates from diseased stems than among those from latently contaminated tubers. The results also suggest that serogroup I is more dominant in the southern than in the northern parts of the country.


2021 ◽  
Author(s):  
Manuela Oliverio ◽  
Monica Nardi ◽  
Maria Luisa Di Gioia ◽  
Paola Costanzo ◽  
Sonia Bonacci ◽  
...  

Semi-synthesis is an effective strategy to obtain both natural and synthetic analogues of the olive secoiridoids, starting from easy accessible natural compounds.


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