Characterisation of Phytophthora capsici isolates from black pepper in Vietnam

Trường, Nguyễn Vĩnh; Liew, E. C. Y.; Burgess, L. W.

doi:10.1016/j.funbio.2009.11.005

Cited by 26 publications

(13 citation statements)

References 57 publications

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“…In addition, in other provinces, a 1:1 ratio of both A1 and A2 mating types of P. capsici was detected in the same fields. Similar observations have been made in Illinois (Islam et al ., ) and Vietnam (Truong et al ., ). The importance of both sexual and asexual reproduction in the epidemiology and management options of P. capsici is well established (Ristaino & Johnston, ; Hausbeck & Lamour, ).…”

Section: Discussionmentioning

confidence: 97%

“…Mean values were compared using Fisher's least significant difference (LSD) test at a significance level of α = 0·05. A chi‐square goodness‐of‐fit test was used to determine whether the ratio of mating type A1 isolates to A2 isolates differed significantly from 1:1 at sites from which at least 10 isolates were collected (Truong et al ., ). Mean values of disease severity (non‐parametric data) were compared using the Kruskal–Wallis test.…”

Section: Methodsmentioning

confidence: 97%

“…For example, both mating types of P. viticola have been detected in the field with a ratio of 1:1 (Scherer & Gisi, ), and CAA‐resistant isolates of P. viticola with a high resistance factor were found frequently in the field (Gisi et al ., ). Phytophthora capsici has a 1:1 distribution of mating types in many parts of the USA (Lamour & Hausbeck, ; Hausbeck & Lamour, ), even in the same field in Illinois (Islam et al ., ) and Vietnam (Truong et al ., ).…”

Section: Introductionmentioning

confidence: 97%

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Sexual reproduction increases the possibility that Phytophthora capsici will develop resistance to dimethomorph in China

Cui

et al. 2014

Plant Pathology

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A total of 1511 isolates of Phytophthora capsici were collected from farms with no history of exposure to the carboxylic acid amide (CAA) fungicides in 32 provinces in China during 2006 to 2013. All 1511 isolates were assayed for mating type and 403 were assayed for sensitivity to dimethomorph (DMM) and metalaxyl. The DMM EC 50 values ranged from 0Á126 to 0Á339 lg mL À1 . Both A1 and A2 mating types were detected on the same farms in four provinces and with a 1:1 ratio. Most isolates were sensitive to metalaxyl but a few exhibited intermediate resistance or resistance to metalaxyl. The segregation of DMM resistance and sensitivity among 337 progeny obtained from hybridization or self-crossing in vitro indicated that the resistance of P. capsici to DMM is controlled by two dominant genes. Eighteen progeny that were derived from hybridization differed in DMM sensitivity and in fitness. Some progeny were as fit as parental isolates. Given the distribution of mating types and therefore the potential for sexual reproduction, the control of resistance by two dominant genes, and the fitness of hybrid progeny, the risk of P. capsici populations developing DMM resistance in China is substantial.

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Section: Discussionmentioning

confidence: 97%

Section: Methodsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 97%

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Sexual reproduction increases the possibility that Phytophthora capsici will develop resistance to dimethomorph in China

Cui

et al. 2014

Plant Pathology

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“…Gejala penyakit BPB lada di lokasi pengambilan sampel bersifat khas dan seragam, yaitu berupa bercak cokelat kehitaman pada daun dengan tepi gejala terlihat bergerigi, dan tampak jelas ketika dihadapkan pada cahaya. Pada cabai, P. capsici menimbulkan gejala bercak seperti bekas tersiram air (water-soaked lesion) sebaliknya pada daun lada berupa bercak berwarna cokelat kehitaman dengan tepi bergerigi (fimbriate) (Truong et al 2009). Gejala khas ini muncul dan berkembang pada kelembapan dan curah hujan tinggi, yaitu berkisar antara bulan Januari sampai April.…”

Section: Pembahasanunclassified

Karakteristik morfologi dan sebaran tipe kawin Phytophthora capsici asal lada di Pulau Jawa

Rohmah¹,

Hadisutrisno²,

Manohara

et al. 2019

J Fitopatol Indones

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ABSTRAKLada (Piper nigrum) merupakan tanaman rempah unggulan Indonesia, namun beberapa tahun terakhir ini mengalami penurunan produksi akibat gangguan penyakit busuk pangkal batang yang disebabkan oleh cendawan Phytophthora capsici. Cendawan ini mempunyai dua tipe kawin, yaitu A1 dan A2 yang berperan penting dalam reproduksi seksual dan pembentukan oospora. Perpindahan bibit lada dari satu daerah ke daerah lain sangat berpotensi mengubah peta sebar tipe kawin patogen tersebut. Tujuan penelitian ini ialah menentukan karakteristik morfologi P. capsici asal lada dan mengetahui sebaran tipe kawin P. capsici di Pulau Jawa. Karakteristik morfologi isolat P. capsici ditandai oleh variasi ukuran dan bentuk sporangium serta tipe koloni. Ukuran panjang (p) dan lebar (l) sporangium berkisar antara 15.1-76.2 µm dan 9.8-44.8 µm, sedangkan rasio p/l ialah 1.12-2.27. Pengujian tipe kawin menunjukkan bahwa tipe kawin A2 lebih dominan ditemukan dibandingkan dengan tipe kawin A1. Penelitian ini menemukan dua tipe kawin yang berbeda dalam area yang sama, yaitu di Kabupaten Pacitan (Jawa Timur) dan Sleman (Daerah Istimewa Yogyakarta). Berdasarkan temuan penelitian ini disarankan strategi pengawasan yang lebih ketat terhadap distribusi bibit lada dari satu daerah ke daerah lain, khususnya untuk daerah yang belum ditemukan tipe kawin tertentu sehingga kemunculan genotipe baru dari hasil perkawinan kedua tipe kawin yang dikhawatirkan lebih virulen dapat dicegah.Kata kunci: oospora, penyakit busuk pangkal batang, reproduksi seksual, sporangium, tanaman rempah ABSTRACT Pepper (Piper nigrum) is one of the most important spice crops in Indonesia. Recently its production declining due to infection of foot rot disease caused by Phytophthora capsici. This pathogen has two different mating types, namely A1 and A2, in which the presence of opposite two mating types is important for sexual reproduction and formation of oospores. The movement of pepper seedling from one area to another is highly facilitated alteration of mating type distribution map of P. capsici. The objectives of this research were to determine the morphological characteristics and the spread of mating types of P. capsici in Java. Morphology characters of P. capsici isolates were indicated by variation in sporangial size and shape, as well as types of colony appearance. The length (l) and width (w) of sporangium were in the range of 15.1-76.2 µm and 9.8-44.8 µm, respectively; while the l/w ratio was 1.12-2.27. Mating type assay showed that A2 type was more dominantly found than A1 type. This study found two different mating types present in the same area, i.e. Regency of Pacitan (East Java) and Regency of Sleman (Special Region of Yogyakarta). The findings of this research suggested that it is J Fitopatol Indones Rohmah et al. 167required more strict control strategy on the mobilization of black pepper seedling particularly in the area where the certain mating type is not found yet so that the emergence of new more virulent genotype of pathogen can be prevented.

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“…According to many scientists, two mating types of pathogen are A1 and A2 [8] [22] [32]. They also were detected in four provinces In Vietnam, co-existing in the same farm, even though in the same poles [29]. Moreover, the number of isolates of P. capsici is still undetected, because individual studies and different locations have found different number of P. capsici isolates.…”

Section: Morphological Detailsmentioning

confidence: 99%

Spread of <i>Phytophthora capsici</i> in Black Pepper (<i>Piper nigrum</i>) in Vietnam

Nguyen¹

2015

ENG

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Black pepper is the one of most important export products in Vietnam. As the largest exporter, Vietnam's pepper commodities account for 58% of total worldwide exporters. However, Vietnam's pepper production is dealing with disease problems, especially foot rot/quick death infected by Phytophthora capsici. The disease results in serious and rapid spread and infection in Vietnam, with yearly reduction of about 2% of total pepper area. Disease management is recently challenging scientists and producers. Investigating characteristics of Phytophthora capsici and causes, therefore, play a significant role in treatment. This paper has indicated three main causes, which contribute to serious infection and outbreak of Phytophthora capsici; they are biological characteristics, climatic condition and cultivation. To control this disease, early detection and prevention are the best ways to manage disease. Finding new varieties, which are Phytophthora capsici tolerance or resistance, is significant in black pepper production worldwide.

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Characterisation of Phytophthora capsici isolates from black pepper in Vietnam

Cited by 26 publications

References 57 publications

Sexual reproduction increases the possibility that Phytophthora capsici will develop resistance to dimethomorph in China

Sexual reproduction increases the possibility that Phytophthora capsici will develop resistance to dimethomorph in China

Karakteristik morfologi dan sebaran tipe kawin Phytophthora capsici asal lada di Pulau Jawa

Spread of <i>Phytophthora capsici</i> in Black Pepper (<i>Piper nigrum</i>) in Vietnam

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Characterisation of Phytophthora capsici isolates from black pepper in Vietnam

Cited by 26 publications

References 57 publications

Sexual reproduction increases the possibility that Phytophthora capsici will develop resistance to dimethomorph in China

Sexual reproduction increases the possibility that Phytophthora capsici will develop resistance to dimethomorph in China

Karakteristik morfologi dan sebaran tipe kawin Phytophthora capsici asal lada di Pulau Jawa

Spread of &lt;i&gt;Phytophthora capsici&lt;/i&gt; in Black Pepper (&lt;i&gt;Piper nigrum&lt;/i&gt;) in Vietnam

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Spread of <i>Phytophthora capsici</i> in Black Pepper (<i>Piper nigrum</i>) in Vietnam