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Characterizations of Colletotrichum Spp., Pathogens on Mango Fruits (Mangifera Indica L

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Characterizations of Colletotrichum Spp., Pathogens on Mango Fruits (Mangifera Indica L Characterizations of Colletotrichum spp., Pathogens on Mango Fruits (Mangifera indica L. cv. ‘Nam Dok Mai’) Sasivimol Laksanaphisut1/ Pattavipha Songkumarn1/ Somsiri Sangchote1/* Received 27 Mar 2019/Revised 07 Jun 2019/Accepted 25 Jun 2019 ABSTRACT Mango anthracnose disease is caused by several species of Colletotrichum including C. gloeosporioides, C. acutatum, C. siamense and C. asianumand. The disease is considered as one of the major constraints of Thai mango export. However, the classification of these pathogens was still unclear. Generally, Colletotrichum spp. are classified based on their morphology. The aims of this study were to characterize and confirm the species of Colletotrichum isolates collected from mango orchards for exporting located in 6 different provinces of Thailand. The characterization was based on pathogenicity test, morphological and molecular characteristics. Forty four isolates were obtained from the symptomatic fruits. Pathogenicity test of all isolates showed typical anthracnose symptoms on the tested mango fruits and Koch’s postulates were fulfilled by re-isolation from the inoculated fruits. The morphological characterization identified all isolates as C. gloeosporioides with 6 morphotypes, as their conidia were hyaline, cylindrical with rounded-end and approximately 14.90x4.02 µm in size. Setae on infected tissue were also observed is some isolates. Species specific primer analysis could confirm 39 isolates of Colletotrichum as C. gloeosporioides. Ribosomal DNA (rDNA) gene sequencing and homology analysis of other five isolates revealed that these isolates were C. gloeosporioides except for the WH9 isolate which was identified as C. acutatum. By combining the results from molecular analysis with morphological characterization and pathogenicity test, we report that C. gloeosporioidesis is the main causal pathogen of mango anthracnose in the mango orchards for exporting in Thailand. Key words: Colletotrichum gloeosporioide, C. acutatum, anthracnose, mango 1/ Department of Plant Pathology, Faculty of Agriculture, Kasetsart University, 50 Ngam Wong Wan Rd, Lat Yao, Chatuchak, Bangkok 10900, Thailand * Corresponding author: [email protected] Thai Agricultural Research Journal Vol. 37 No. 2 May - August 2019 197 Introduction wounded and unwounded inoculations of Thailand is among the world’s fif ive pathogenic Colletotrichum spp. led to the largest net exporters of fresh mango fruit disease development, different disease (FAOSTAT, 2012) with the cultivated area levels were observed as shown in the study of 1,967,904 rai giving the production of Prihastuti et al., (2009). The application approximately 1,462 kg/rai in 2017 (Offif ice of molecular techniques has been advocated of Agricultural Economics, 2017). The to characterize species of several plant cultivated areas of exported mango pathogenic fungi including Colletotrichum (cv.‘Nam Dok Mai’) in Thailand are spp. Random amplified polymorphic Phitsanulok, Nakhon Ratchasima, Sakeao, DNA (RAPD) marker had been used PrachinBuri, Chiang Mai and Chchoengsao to separate C. gloeosporioides from provinces. One of the major constraints of C. fragariae, a causal agent of strawberry Thai mango export is anthracnose disease anthracnose (MacKenzieet al., 2008), and caused by Colletotrichum spp. Among them, Internal Transcribed Spacer (ITS) of C. gloeosporioides and C. acutatum were rRNA gene was widely applied to frequently reported to be the causal identify Colletotrichum spp. including agents of the disease (Rivera-Vargas et al., C. gloeosporioides, C. fragariae and 2006; Dhumtanom and Chantrasri, 2011). C. kahawae (Adaskaveg et al., 1997). Traditionally, Colletotrichum spp. have been In addition, ITS sequenceing analysis identified on the basis of morphological was able to separate C. acutatum, characteristics such as conidial size C. simmondsii and C. fragariae from and shape, appressorium shape and the other strawberry anthracnose pathogens pathogenicity test (Martínez-Culebras et al., (Anderson et al., 2012). Although several 2000); however, these methods are often species such as C. gloeosporioides, a main unreliable for species classification (Rive- fungus and C. acutatum, a minor one have ra-Vargas et al., 2006) due to the fact that been reported to be associated with mango morphological features expressing on the anthracnose disease in the study of culture media may differ from those Rivera-Vargas et al. (2006), the identifif ication expressing on the host plant. As shown in of these fungal pathogens is still ambiguous the study of Smith (1990), C. fragariae in Thailand. The present study aimed to associated with strawberry in the characterize and confif irm the main species southeastern United States produced setae of Colletotrichum associated with mango when they were observed on the plant fruit anthracnose obtained from different tissue but not the media culture. Although cultivated areas of Thailand by 1) determining 198 วารสารวิชาการเกษตร ปีที่ 37 ฉบับที่ 2 พฤษภาคม - สิงหาคม 2562 their pathogenicity on unwounded fruits for further studies. 2) evaluating their morphological characteristics both on the host and 2. Pathogenicity testing culture media 3) Molecular analyzing Before being inoculated with the using species-specifif ic primers for tested isolates, mature green mango fruits C. gloeosporioides (CgInt/ITS4) and were dipped in hot water at 55°oC for 5 min C. acutatum (CaInt2/ITS4) and DNA followed by dipping in cold water for 5 min sequencing analysis of rDNA gene. and left untill completely dried. The unwounded fruit was artificially inoculated Materials and Method with 25 µ l of conidial suspension (3x106 1. Sample collection and isolation conidia/ml) of each individual Colletotrichum Ten mango fruits were obtained isolate and was subsequently covered from each mango exported orchard in with sterile Whatman No.1 filter paper disc Phitsanulok, Nakhon Ratchasima, Sakeao, (0.5x0.5 cm) maintain moisture of the Prachinburi, Chiang Mai and Chachoengsao inoculum. Each fruit was inoculated at 3 provinces, Thailand during April-July of positions including 2 cm from stem end, in 2013-2014. Locations were recorded. The the middle and 2 cm from stylar end on one samples were incubated at room side of the fruit. For control treatment, each temperature (25± 5°oC) until ripening. Fruits fruit was dropped with 25 µ l of sterile showing anthracnose symptoms were distilled water. All inoculated fruits were isolated for the causal pathogens by tissue maintained under high relative humidity by transplanting method. Advanced margins of covering with moist plastic bag at 25± 5°oC infected tissues were cut about 0.5x0.5 cm for 24 h. The plastic bag was then removed in size and surface disinfected with 1% and inoculted fruits were further incubated sodium hypochlorite solution for 3 min, at 25-28ºoC for 10 days, totally 4 inoculated then rinsed 2 times, with sterilized distilled fruits per each isolate were determined for water for transferred onto potato dextrose disease incidence (%). agar (PDA) plates and incubated for 7 days at 25± 2°oC under alternate white and near 3. Morphological characterization ultraviolet light 12 h light/dark cycle. Pure The morphological characteristics culture of each Colletotrichum isolate was were investigated on infected tissue and obtained by single conidia isolation and culture media. Conidial suspension of each was kept either on potato carrot agar (PCA) Colletotrichum isolate was prepared from at 15°oC or in 15% glycerol solution at -70°oC 7-day-old culture with distilled water at Thai Agricultural Research Journal Vol. 37 No. 2 May - August 2019 199 3x106 conidia/ml then artificially inoculated 5-day-old culture was transferred and by spraying on unwounded mango fruit placed at the center of a 90 mm Pyrex@ surface and incubated at 25-28°oC for petri dish containing 30 ml Difco® PDA 10 days. Conidial, mass color, acervulus and media. The cultured plates were incubated setae characteristics were observed at 25± 2°oC under alternate white and near on fresh and thin section of the diseased ultraviolet light 12 h light/dark cycle with fi lesion which was mounted on the slide with f ive replications for each isolate. After lactoglycerol and investigated under compound incubation for 7 days, the radial growth of microscope at 40x magnification. Conidial mycelia (mm) was measured daily, and size was measured with Axio Vision Rel. 4.9.1 radial growth rate was then calculated. In software at 100 conidia per replication. addition, the colony color of each isolate Totally, 4 independent replications were was recorded. performed. Appressorium and colony characteristics were observed on PDA 4. Molecular characterization culture with mycelium newly isolated from 4.1 Genomic DNA extractions the disease symptom area. Appressorium Each isolate of Colletotrichum spp. was produced using a slide culture was cultured in 75 ml of MB [Malt broth: technique (Weir et al., 2012). Mycelium plug malt extract (Merck)] for 2-3 days at room of each Colletotrichum isolate was cultured temperature (25± 2ºoC) on orbital shaker at on PDA culture. Sterile cover slips (0.5x0.5 120 rpm. Young mycelia were harvested cm) were plugged into the culture media and transferred to 1.5 ml sterile eppendorf half way of its height and subsequently tubes. Mycelia were grounded in 200 µ l incubated at 25±+2°oC for 2 weeks. Vegetative solutionI (0.1 M NaCl, 0.2 M sucrose, 0.01 hyphae were grown on the surface of M EDTA and 0.03 M Tris HCl) containing the cover slip to produce appressoria. 10 µ l protease K, then added with 200 µ l The cover slip was removed and placed on solution II (50 mM Tris HCl, 50 mM EDTA a lactoglycerol droplet on the glass slide. and 2.5% SDS) and incubated at 65°oC Appressorial shape was characterized for 15 min. Subsequently, each tube was under compound microscope at 40x added with 128 µ l solution III (73.14 g magnification. Colony characteristics potassium acetate and 28.75 ml acetic acid including growth rate and colony color on in total volume at 300 ml of sterile water) the Difco® PDA media were observed. and 300 µ l of chloroform then mixed gently For each isolate, 5 mm diameter plug of and kept in ice for 10 min.
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