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Fungi Detected in Trunk of Stone Fruits in the Czech Republic

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Fungi Detected in Trunk of Stone Fruits in the Czech Republic PecenkaJ et al.:Layout 1 5/16/17 12:00 PM Page 1 AGRáRTUDOMáNyI KözLEMéNyEK , 2017/72. Fungi detected in trunk of stone fruits in the Czech Republic 1Jakub Pečenka – 1Eliška Peňázová – 2Dorota Tekielska – 3Ivo Ondrášek – 3Tomáš Nečas – 1Aleš Eichmeier 1Mendel University Faculty of Hoticulture, Department of Genetics, Lednice, Czech Republic 2University of Agriculture, Faculty of Biotechnology and Horticulture, Department of Plant Protection, Krakow, Poland 3Mendel University Faculty of Hoticulture, Department of Fruit Growing, Lednice, Czech Republic [email protected] SUMMARY This study was focused on detection of the spectrum of fungi in the wood of stone fruits using molecular genetic methods. Samples were obtained from apricots, plums and sweet cherry trees from region of Moravia, one sample was obtained from Myjava (Slovakia). Segments of symptomatic wood were obtained from dying stone fruit trees with very significant symptoms. This study describes detection of the fungi in the wood of 11 trees in general in 5 localities. The cultivation of the fungi from symptomatic wood and sequencing of ITS was carried out. Eleven fungal genera were determined in the stone fruits wood, particularly Irpex lacteus, Fomes fomentarius, Neofabraea corticola, Calosphaeria pulchella, Cytospora leucostoma, Phellinus tuberculosus, Stereum hirsutum, Collophora sp., Pithomyces chartarum, Aureobasidium pullulans, Fusarium sp. The results of this study demonstrate that the reason of declining of stone fruit trees in Moravia is caused probably by trunk pathogens. Keywords: stone fruit, fungal trunk pathogens, detection, ITS, Calosphaeria, Cytospora, Collophora genera INTRODUCTION are going to be old. On the other hand the production areas of plums increased almost five times (Buchrová Diseases of fruit trees have a negative effect on 2015). However, the yield and quality of the fruit mar ket their yield and viability in growing regions around the is lagging behind compared with other countries but world (Gramaje et al. 2010, 2012; Bertsch et al. 2013). nutritional value and taste remain comparable in the Causal pathogens of premature death include viruses, Czech Republic. especially PPV (Plum pox virus), bacteria ( Pseudomo - There are several causes of these conditions including nas syringae pv. Syringae ) or still world spreading Xy - deficiencies in the selection of suitable areas for growing lella fastidiosa , a phytoplasma 'Candidatus Phyto plas- fruits as not suitable agronomic technologies, increasing ma prunorum' or, 'Candidatus Phytoplasma mali' , investment costs for the establishment and maintenance 'Candidatus Phytoplasma pyri' and last but not least of the production areas and ultimately lower yields and fungal trunk disease (TD) pathogens. TD pathogens are lower fruit quality due to the effect of abiotic and biotic agents of necrotic rot which are characterized by the factors (Becha 2013). Maintaining good health of stone creation of dead and typically coloured tissues. TDs fruits orchards becomes very difficult because of the fungal species are complex of taxonomically unrelated significant proportion of aged plantations, which is a fungi from Botryosphaeriaceae and Diatrypaceae family prerequisite for a higher incidence of diseases and pests. and species of genera Cadophora, Campylocarpon, These areas may serve as a niche of potential source for Col lophora, Cylindrocarpon, Cylindrocladiella, Dac - the spread of the diseases into productive plantations of ty lonectria, Ilyonectria, Phaeoacremonium and Phaeo - stone fruits (www.ovocnarska unie.cz 2016). moniella and fungi of Basidiomycetes . The history of fruit growing in the Czech Republic TRUNK PATHOGENS OF STONE FRUITS has a long tradition. However there was a big decline of fruit growing after Battle of Bílá Hora in 1620. Polák et al. (2010), Nečas et al. (2014) and Žežlina Expansion of fruit growing came after reforms of et al. (2016), published the most important pathogens Josef II and the establishment of associations of fruit of stone fruits including Candidatus Phytoplasma pru - breed ers (Becha 2013). Stone fruits grown traditionally no rum , Plum pox virus (PPV), Xanthomonas cam pest - in the Czech Republic include the plums, the cherries, ris pv. pruni , Pseudomonas syringae pv. persicae and and in the warmer areas also the apricots. Currently the pv. morsprunorum and also trunk pathogens like Leu - level of cultivation is not satisfying. From 1950 till now cos toma persoonii or Valsaria insitiva . Another very stone fruit production areas in the Czech Republic are important factor in stone fruit orchards are the interactions decreased rather and/or stagnate. The worse situation is between and succession between the more recent and in peach orchards where the area was decreased by older fungal diseases, such as those observed between 47%. Nowadays stone fruit growers leave this activity bacterial diseases and perennial canker (Žežlina et al. in the Czech Republic. 2016). One of the reasons are an important losses of trees Cross infection by fungal trunk pathogens has been seven years after planation. Plantation areas of sweet and occurred worldwide. It supports the theory that multiple sour cherries are stagnating however these plantations hosts are affected by wide spectrum of fungal pathogens. 121 PecenkaJ et al.:Layout 1 5/16/17 12:00 PM Page 2 AGRáRTUDOMáNyI KözLEMéNyEK , 2017/72. Simultaneously infected host could work as sources Cytospora leucostoma of inoculum of trunk pathogens (Olmo et al. 2015). Cytospora leucostoma (syn. Valsa leucostoma ) is Crops are cultivated close to vineyards such as olives an important pathogen of peaches and other stone fruits (Carlucci et al. 2013, 2014; Úrbez-Torres et al. 2013), and it is limitation factor of fruit production in many pome fruit trees (Cloete et al. 2011) and Prunus sp. areas. Symptoms include cankering of the trunk and (Damm et al. 2008, 2010; Inderbitzin et al. 2010; Gramaje branches, branch dieback and progressive weakening of et al. 2012), have been considered as potential sources the tree (Scorza and Pusey 1984). C. leucostoma gave of inoculum for the trunk disease pathogens from which evidence of xylem dysfunction as an important trigger grapevines could be infected. Damm et al. (2008) and of symptom. Affected trees during active growth se crete Gramaje et al. (2012) published that these hosts could gum within and outside of tissues at loci of infection serve as an additional niche of pathogen spread. and display symptoms of acute and chronic water stress (Hampson and Sinclair 1973). DESCRIPTON OF FUNGI DETECTED IN THE WOOD OF STONE FRUITS IN CZECH REPUBLIC Phellinus tuberculosus All taxa are parasitic and/or saprobic on wood and Irpex lacteus cause a white rot. Its fruiting bodies, often growing on Cosmopolitan white rot fungus typically inhabiting wood, are resupinate, sessile, and perennial. The flesh is hardwood braches. Fruiting bodies are annual, broadly tough and woody or cork-like, and brown in colour (Fischer effused to effused-reflexed and sessile. Often fruiting 1996, He et al. 2014). P. tuberculosus is essentially bodies fuse laterally to make large sheets that totally asso ciated with Prunus sp., although it is also reported cover broken or dead branches. Pore surface appears from other deciduous trees (Ghobad-Nejhad and Dai spiny because of erosion and splitting of pores, white 2007). to pale cream-colored. Pores initially angular, 2–3 per mm. White-rot on fallen branches and dead branches Stereum hirsutum still attached to the tree (Binion et al. 2008). Species of Stereum are easily recognized by their relatively thin fruiting bodies that are often fan shaped Fomes fomentarius to paddle-shaped and their smooth spore-bearing under The fungus causes decay of birches and oaks. surface that lacks pores, gills or other supporting Perennial, hard, woody, horse hoof-shaped conk with structures. All Stereum species cause the white sap prominent zones and furrows, broadly attached to rot and associated with the dead trees and woody sub strate. Solitary or in groups on living trees, stumps de bris. Several other Stereum species grow on conifers and logs. Causes a white spongy mottled heart rot of (Glaeser and Smith 2010). living trees, continues to fruit on dead stumps and logs. Decay first appears as a light brown discoloration with Collophora sp. the wood remaining quite firm. Wood with advanced Species of the genus Collophora have been reported decay is yellow-white, soft and spongy, and frequently in a list of fungal trunk pathogens isolated from Prunus sp. contains brown to black zone lines. Small radial cracks Collophora species were isolated from the black spots filled with yellow fungal mycelium develop, giving the and dark brown to black streaking of the xylem tissue decay a mottled appearance. Most common on birch but together with Phaeoacremonium sp. (Gramaje et al. has been reported on oak (Glaeser and Smith 2010). 2012). Colonies of Collophora sp. are slow-growing, moist, white, cream or reddish colours, with sparse or Neofabraea corticola syn. Pezicula corticola lacking aerial mycelium. Conidiophores reduced to The genus Neofabraea is an important pathogenic conidiogenous cells. Conidiogenous cells enteroblastic, genus that representatives attack mainly apple and pear intercalary, reduced to very short adelophialides or more trees and cause bark diseases (anthracnose canker and often with collarettes formed directly on hyphal cells. perennial canker) and bull’s eye rot of fruits
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