Formae Speciales and Races of Fusarium oxysporum Causing Wilts of the Cucurbitaceae

Armstrong, G. M.

doi:10.1094/phyto-68-19

Cited by 230 publications

(263 citation statements)

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“…Effect of plant age on pathogenicity and aggressiveness of F. oxysporum isolates Armstrong and Armstrong (1978) proposed that the stage or age of the plant affects the aggressiveness of F. oxysporum. In our study, as early as 7 DAI, typical symptoms induced by F. oxysporum were observed on both 7-day and 1-monthold plants.…”

Section: Pathogenicity and Aggressiveness Of F Oxysporum Isolates Onmentioning

confidence: 99%

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Pathogenicity and aggressiveness of Fusarium oxysporum Schl. in bottle gourd and bitter gourd

Cumagun¹,

Aguirre²,

Relevante³

et al. 2010

Plant Prot. Sci.

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Cumagun C.J.R., Aguirre J.A., Relevante C.A., Balatero C.H. (2010): Pathogenicity and aggressiveness of Fusarium oxysporum Schl. in bottle gourd and bitter gourd. Plant Protect. Sci., 46: 51-58.Fusarium oxysporum is responsible for a large range of diseases on economically important crops such as bitter gourd and bottle gourd. Pathogenicity and aggressiveness of F. oxysporum in bitter gourd and bottle gourd isolated from two breeding stations of East-West Company in the Philippines namely San Ildefonso, Bulacan and Lipa, Batangas were tested. Eleven F. oxysporum isolates from bitter gourd and 12 isolates from bottle gourd were inoculated on 7-day and 1-month-old bitter gourd and bottle gourd plants in the greenhouse. All F. oxysporum isolates from bitter gourd were pathogenic on 7-day-old and 1-month-old bitter gourd and nine out of 12 isolates from bottle gourd were pathogenic on bottle gourd. Three isolates from the infested soil were non-pathogenic on bottle gourd. There was a significant difference in aggressiveness of the isolates on their natural hosts (P ≤ 0.05). There also was a significant difference in the aggressiveness of isolates pathogenic on bitter gourd from Batangas and Bulacan (P ≤ 0.05) but isolates from Batangas and Bulacan had similar aggressiveness as bottle gourd (P ≥ 0.05). Aggressiveness of F. oxysporum on 7-day-old bitter gourd and bottle gourd was significantly different compared to those on 1-month-old plants, demonstrating an effect of the host age onaggressiveness. Correlations between aggressiveness of F. oxysporum isolates on 7-day-old and 1-month-old bitter gourd and bottle gourd were moderate (r = 0.63, 0.78). Out of 12 isolates from bottle gourd, only one isolate was pathogenic on 7-day-old bitter gourd. Four of the isolates from bitter gourd were pathogenic on 7-day-old bottle gourd but not on 1-month-old bottle gourd. No cross infection was observed on mature plants.

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Section: Pathogenicity and Aggressiveness Of F Oxysporum Isolates Onmentioning

confidence: 99%

“…Bouhot (1981) also reported that one forma specialis could be induced to mutate to another forma specialis and become pathogenic to another host. Cross infectivity of formae speciales is generally only in seedlings as host specificity is the rule in mature plants (Owen 1956;Armstrong & Armstrong 1978;Gerlagh & Blok 1988).…”

mentioning

confidence: 99%

Pathogenicity and aggressiveness of Fusarium oxysporum Schl. in bottle gourd and bitter gourd

Cumagun¹,

Aguirre²,

Relevante³

et al. 2010

Plant Prot. Sci.

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“…Terdapat 65 forma spesiales F. oxysporum yang telah dilaporkan dan salah satu di antaranya ialah F. oxysporum f. sp. cepae (Armstrong & Armstrong 1968). Serangan F. oxysporum pada bawang merah di Sri Lanka menyebabkan kehilangan hasil antara 20-30% (Kuruppu 1999 …”

Section: F U S a R I U M O X Y S P O R U M S C H L E C H T E M E N Dunclassified

Pengembangan Teknik Deteksi Fusarium Patogen Pada Umbi Benih Bawang Merah (Allium ascalonicum) di Laboratorium

Fadhilah¹,

Wiyono

Surahman

2016

J.Hort

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Naskah diterima tanggal 7 Maret 2014 dan disetujui untuk diterbitkan tanggal 5 Juni 2014 ABSTRAK. Penyakit layu fusarium yang disebabkan oleh Fusarium oxysporum merupakan salah satu penyakit penting pada bawang merah (Allium ascalonicum). Sebagian besar petani menggunakan umbi sebagai benih dan diketahui bahwa beberapa patogen dapat terbawa oleh benih seperti Fusarium oxysporum. Oleh karena itu diperlukan pengujian kesehatan benih untuk mencegah penyebaran penyakit tersebut. Salah satu metode sederhana dan efektif untuk digunakan di laboratorium adalah blotter test. Namun beberapa strain F. oxysporum terbukti tidak bersifat patogenik, serta tidak dapat dibedakan secara morfologi dengan strain yang bersifat patogenik. Penelitian ini bertujuan menentukan parameter uji dan jumlah sampel minimal dalam deteksi Fusarium oxysporum pada umbi bawang merah dengan metode blotter test. Hasil pengujian menunjukkan bahwa parameter nekrosis pada basal plate umbi bawang merah mempunyai koefisien korelasi (r) sebesar 0,77 terhadap tingkat infeksi pada growing on test (GOT) dan lebih besar dari tingkat infeksi fusarium (0,34) pada blotter test. Dari 195 isolat Fusarium spp. yang diuji, diketahui bahwa sebagian besar isolat bersifat nonpatogenik. Penentuan jumlah minimal umbi dengan plot kurva rerata jumlah nekrosis pada basal plate dan standar deviasi, menunjukkan jumlah sampel umbi minimal untuk blotter test adalah 150 umbi. Perhitungan jumlah sampel dengan formal probability statement yang menunjukkan jumlah umbi minimal untuk blotter test adalah 138 umbi.Katakunci: Benih; Korelasi; Blotter test; Nekrosis; Sampel ABSTRACT. One of the most important diseases of shallot (Allium ascalonicum) in Indonesia is fusarium wilt caused by Fusarium oxysporum. Most farmer use shallot bulb for their plantation, and some pathogen can be transmitted by this bulb such as Fusarium oxysporum. Blotter test is a simple and effective method to apply in laboratory for seed health testing. Unfortunately, some strains of F. oxysporum are not patogenic and they cannot be distinguished morphologically from pathogenic strains. The research aimed to determine the parameter and the minimum sample number of seed should be applied for Fusarium oxysporum detection on shallot bulb by using blotter test. The result showed that necrosis on basal plate of shallot bulb had correlation coefficient (r) 0.77 to the disease infection in GOT and it was higher than Fusarium infection (0.34). Therefore, necrosis of basal plate can be applied as a parameter in blotter test for Fusarium wilt. The 195 isolats of Fusarium sp. were tested for pathogenicity and it showed many isolates were found in blotter test were not pathogenic to shallot. Curve plot of necrosis rate and its deviation standard were used to determine the minimum sample number of shallot bulb should be tested in the blotter. The result showed that the minimum sample for blotter test was 150 bulb, and the formal probability statement was also showed that minimum number of shallot was 138 bulbs.

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“…(Armstrong & Armstrong, 1978;1981;Chen et al, 1985). Race 6 of Fov has been discovered in Brazil (Armstrong & Armstrong, 1978) and since then no further studies were made to characterize the races present in the country.…”

Section: Introductionmentioning

confidence: 99%

EF-1α gene and IGS rDNA sequencing of Fusarium oxysporum f. sp. vasinfectum and F. oxysporum f. sp. phaseoli reveals polyphyletic origin of strains

Silva

Vechiato

Harakava

2014

Trop. plant pathol.

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The fungi Fusarium oxysporum f. sp. vasinfectum (Fov) and F. oxysporum f. sp. phaseoli (Fop) are important pathogens that cause wilt on cotton and common bean, respectively. In the present study, phylogenetic trees constructed with partial sequences of the translation elongation factor gene and ribosomal intergenic spacer region of Brazilian Fov and Fop strains revealed polyphyletic origin of strains within both formae speciales. This creates an obstacle for the development of specific molecular diagnostic methods and explains the failure of supposedly specific methods described in the literature to correctly discriminate formae speciales of F. oxysporum.

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Formae Speciales and Races of Fusarium oxysporum Causing Wilts of the Cucurbitaceae

Cited by 230 publications

References 0 publications

Pathogenicity and aggressiveness of Fusarium oxysporum Schl. in bottle gourd and bitter gourd

Pathogenicity and aggressiveness of Fusarium oxysporum Schl. in bottle gourd and bitter gourd

Pengembangan Teknik Deteksi Fusarium Patogen Pada Umbi Benih Bawang Merah (Allium ascalonicum) di Laboratorium

EF-1α gene and IGS rDNA sequencing of Fusarium oxysporum f. sp. vasinfectum and F. oxysporum f. sp. phaseoli reveals polyphyletic origin of strains

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Formae Speciales and Races of Fusarium oxysporum Causing Wilts of the Cucurbitaceae

Cited by 230 publications

References 0 publications

Pathogenicity and aggressiveness of Fusarium oxysporum Schl. in bottle gourd and bitter gourd

Pathogenicity and aggressiveness of Fusarium oxysporum Schl. in bottle gourd and bitter gourd

Pengembangan Teknik Deteksi Fusarium Patogen Pada Umbi Benih Bawang Merah (Allium ascalonicum) di Laboratorium

EF-1&#945; gene and IGS rDNA sequencing of Fusarium oxysporum f. sp. vasinfectum and F. oxysporum f. sp. phaseoli reveals polyphyletic origin of strains

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EF-1α gene and IGS rDNA sequencing of Fusarium oxysporum f. sp. vasinfectum and F. oxysporum f. sp. phaseoli reveals polyphyletic origin of strains