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First Report on Fusarium Wilt of Zucchini Caused by Fusarium oxysporum, in Korea.

Choi IY, Kim JH, Lee WH, Park JH, Shin HD - Mycobiology (2015)

Bottom Line: Infected plants eventually died during growth.Pathogenicity of a representative isolate was demonstrated via artificial inoculation, and it satisfied Koch's postulates.To our knowledge, this is the first report of F. oxysporum causing wilt of zucchini in Korea.

View Article: PubMed Central - PubMed

Affiliation: Jeollabuk-do Agricultural Research and Extension Services, Iksan 570-704, Korea.

ABSTRACT
Fusarium wilt of zucchini in Jeonju, Korea, was first noticed in May 2013. Symptoms included wilting of the foliage, drying and withering of older leaves, and stunting of plants. Infected plants eventually died during growth. Based on morphological characteristics and phylogenetic analyses of the molecular markers (internal transcribed spacer rDNA and translation elongation factor 1α), the fungus was identified as Fusarium oxysporum. Pathogenicity of a representative isolate was demonstrated via artificial inoculation, and it satisfied Koch's postulates. To our knowledge, this is the first report of F. oxysporum causing wilt of zucchini in Korea.

No MeSH data available.


Related in: MedlinePlus

Fusarium wilt caused by Fusarium oxysporum on zucchini (cv. Taeyang). A, The leaves and stems were infected, devastating the whole plants. Note severe infection on the left bed; B, The vascular system was blocked by the fungus; C, Dark streaks on an infected plant; D, Monophialides with microconidia on hypha; E, Microconidia; F, One-week-old colony of F. oxysporum growing on potato dextrose agar.
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Figure 1: Fusarium wilt caused by Fusarium oxysporum on zucchini (cv. Taeyang). A, The leaves and stems were infected, devastating the whole plants. Note severe infection on the left bed; B, The vascular system was blocked by the fungus; C, Dark streaks on an infected plant; D, Monophialides with microconidia on hypha; E, Microconidia; F, One-week-old colony of F. oxysporum growing on potato dextrose agar.

Mentions: In May 2013, hundreds of zucchini plants (cv. Taeyang) exhibited wilt symptoms as a result of an infection by a previously unknown fungus, with an incidence of 15~35% (percentage of plants affected) in various plastic greenhouses that were surveyed in the Jeonju City of Korea. Initial symptoms started with chlorosis of leaves in April. The infected plants dropped off progressively upward, wilted, and eventually died in early June, causing severe economic loss (Fig. 1A). According to the farmers, the wilt disease appeared annually and developed during hot weather. As this infection clogged the vascular system, interfering with water movement, leaves turned pale green to yellow and root growth was inhibited. The infected stems developed necrosis and vascular discoloration internally. Internal vascular and cortical tissues of the plant crowns developed brown-to-orange-brown discoloration (Fig. 1B and 1C).


First Report on Fusarium Wilt of Zucchini Caused by Fusarium oxysporum, in Korea.

Choi IY, Kim JH, Lee WH, Park JH, Shin HD - Mycobiology (2015)

Fusarium wilt caused by Fusarium oxysporum on zucchini (cv. Taeyang). A, The leaves and stems were infected, devastating the whole plants. Note severe infection on the left bed; B, The vascular system was blocked by the fungus; C, Dark streaks on an infected plant; D, Monophialides with microconidia on hypha; E, Microconidia; F, One-week-old colony of F. oxysporum growing on potato dextrose agar.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4505008&req=5

Figure 1: Fusarium wilt caused by Fusarium oxysporum on zucchini (cv. Taeyang). A, The leaves and stems were infected, devastating the whole plants. Note severe infection on the left bed; B, The vascular system was blocked by the fungus; C, Dark streaks on an infected plant; D, Monophialides with microconidia on hypha; E, Microconidia; F, One-week-old colony of F. oxysporum growing on potato dextrose agar.
Mentions: In May 2013, hundreds of zucchini plants (cv. Taeyang) exhibited wilt symptoms as a result of an infection by a previously unknown fungus, with an incidence of 15~35% (percentage of plants affected) in various plastic greenhouses that were surveyed in the Jeonju City of Korea. Initial symptoms started with chlorosis of leaves in April. The infected plants dropped off progressively upward, wilted, and eventually died in early June, causing severe economic loss (Fig. 1A). According to the farmers, the wilt disease appeared annually and developed during hot weather. As this infection clogged the vascular system, interfering with water movement, leaves turned pale green to yellow and root growth was inhibited. The infected stems developed necrosis and vascular discoloration internally. Internal vascular and cortical tissues of the plant crowns developed brown-to-orange-brown discoloration (Fig. 1B and 1C).

Bottom Line: Infected plants eventually died during growth.Pathogenicity of a representative isolate was demonstrated via artificial inoculation, and it satisfied Koch's postulates.To our knowledge, this is the first report of F. oxysporum causing wilt of zucchini in Korea.

View Article: PubMed Central - PubMed

Affiliation: Jeollabuk-do Agricultural Research and Extension Services, Iksan 570-704, Korea.

ABSTRACT
Fusarium wilt of zucchini in Jeonju, Korea, was first noticed in May 2013. Symptoms included wilting of the foliage, drying and withering of older leaves, and stunting of plants. Infected plants eventually died during growth. Based on morphological characteristics and phylogenetic analyses of the molecular markers (internal transcribed spacer rDNA and translation elongation factor 1α), the fungus was identified as Fusarium oxysporum. Pathogenicity of a representative isolate was demonstrated via artificial inoculation, and it satisfied Koch's postulates. To our knowledge, this is the first report of F. oxysporum causing wilt of zucchini in Korea.

No MeSH data available.


Related in: MedlinePlus