Studies on anastomosis groups of Rhizoctonia solani isolates causing disease in two forest nurseries in Poland

Stepniewska-Jarosz, S.; Mańka, M.; Asiegbu, Fred O.

doi:10.1111/j.1439-0329.2006.00439.x

Cited by 14 publications

(11 citation statements)

References 42 publications

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“…Differences in aggressiveness was observed among isolates of AG 2‐1 towards endive; on lettuce and carrot not only AG 2–1 isolates, but also isolates of several other AGs differed in aggressiveness. This observation was previously reported for several AGs in combination with a specific crop and in particular for AG 2‐1 isolates (Schneider et al ., 1997b; Stepniewska‐Jarosz et al ., 2006; Woodhall et al ., 2007). The present study also confirmed the pathogenic characteristics of some AGs, as already described, e.g.…”

Section: Discussionmentioning

confidence: 99%

Characterization and pathogenicity of Rhizoctonia isolates associated with cauliflower in Belgium

Pannecoucque

Beneden

Höfte³

2008

Plant Pathology

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Sixty-two isolates of Rhizoctonia spp. were collected from Belgian cauliflower fields during 2005 and 2006. The majority of the isolates (60 out of 62) had multinucleate cells and were identified as Rhizoctonia solani . Characterization of anastomosis groups (AGs) was performed using pectic zymograms, PCR-RFLP and sequencing of the rDNA-ITS region. The most prevalent AG was AG 2-1 (55% of isolates), followed by AG 2-1 subset Nt (11%), AG 1-1C (8%), AG 5 (8%), AG 4 HGII (6%), AG 3 (5%) and AG 1-1B (3%). Pathogenic potential towards different vegetable crops and towards maize was determined. Damage to cauliflower and endive was caused by different AGs, with the isolates aggressive towards cauliflower belonging to AG 2-1, AG 2-1 subset Nt, AG 4 HGII, AG 1-1C, AG 1-1B and AG 2-2, and those aggressive towards endive belonging to AG 1-1B, AG 1-1C, AG 2-1 subset Nt, AG 2-2, AG 4 HGII and AG 5. The most aggressive isolates towards bean belonged to AG 2-1 subset Nt and AG 2-2, for lettuce to AG 1-1B and AG 2-1, on carrot to AG 4 HGII and towards maize to AG 2-2. Within the isolates of AG 2-1, variability was observed in PCR-RFLP pattern and in aggressiveness towards several crops, indicating this subgroup to be heterogeneous. This is the first study concerning the occurrence of R. solani AGs causing wirestem in Belgian cauliflower fields and the first report of aggressive isolates of AG 1-1C, AG 2-1 subset Nt and AG 4 HGII associated with cauliflower.

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Section: Discussionmentioning

confidence: 99%

Characterization and pathogenicity of Rhizoctonia isolates associated with cauliflower in Belgium

Pannecoucque

Beneden

Höfte³

2008

Plant Pathology

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“…There is thus a need to assess the properties of plant nursery networks in a number of representative regions and for various pathogens and endophytes (e.g. Stanosz et al ., 2005; Giménez‐Jaime et al ., 2006; Menkis et al ., 2006; Pinto et al ., 2006; Stepniewska‐Jarosz et al ., 2006). This need is immediate wherever nurseries have been tested positive for the presence of Phytophthora ramorum , the causal agent of sudden oak death (e.g.…”

Section: Potential Implications For Plant and Forest Pathologymentioning

confidence: 99%

Modelling disease spread and control in networks: implications for plant sciences

et al. 2007

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SummaryNetworks are ubiquitous in natural, technological and social systems. They are of increasing relevance for improved understanding and control of infectious diseases of plants, animals and humans, given the interconnectedness of today's world. Recent modelling work on disease development in complex networks shows: the relative rapidity of pathogen spread in scale-free compared with random networks, unless there is high local clustering; the theoretical absence of an epidemic threshold in scale-free networks of infinite size, which implies that diseases with low infection rates can spread in them, but the emergence of a threshold when realistic features are added to networks (e.g. finite size, household structure or deactivation of links); and the influence on epidemic dynamics of asymmetrical interactions. Models suggest that control of pathogens spreading in scale-free networks should focus on highly connected individuals rather than on mass random immunization. A growing number of empirical applications of network theory in human medicine and animal disease ecology confirm the potential of the approach, and suggest that network thinking could also benefit plant epidemiology and forest pathology, particularly in human-modified pathosystems linked by commercial transport of plant and disease propagules. Potential consequences for the study and management of plant and tree diseases are discussed. Key words: complex networks, disease management, epiphytotics, landscape pathology, network structure, plant pathogens, small-world, spatial dispersal. IntroductionMuch scientific work is currently focusing on the properties of networks (see Barabási & Albert, 1999;Newman, 2003; papers cited therein). From a physical point of view, networks may involve transport of energy, matter or information. From a mathematical standpoint, networks are sets of elements and of the relations between them. From both perspectives, networks are models applicable to a wide variety of natural, technological and social systems (e.g. Strogatz, 2001; Albert & Barabási, 2002; Table 1). Networks can be of interest to plant scientists when they are formed by a physical structure, when they refer to abstract relationships between connected entities (e.g. different species), and when they underline processes or flows in a structure. Network types (SF, scale-free; SW, small-world; V, various types; N, none of the previous types) are assigned on the basis of the references provided and do not rule out the possibility that other studies of networks of a similar nature may suggest a different structure. For other references the reader is referred to reviews by, for example, Albert & Barabási (2002), Dorogovtsev & Mendes (2002) andNewman (2003). Network theory (e.g. Bollobás, 1979; Chartrand, 1985; Chen, 1997) has many practical biological applications in plant sciences, for example biochemical networks (Aloy & Russell, 2004; Arita, 2005; De Silva & Stumpf, 2005; Green & Sadedin, 2005;Proulx et al ., 2005;Sweetlove & Fernie, 2005;Uhrig, 20...

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“…The most severe pathogens causing damping-off in Polish forest nurseries include species from genera: Fusarium, Rhizoctonia, Pythium, Alternaria and Cylindrocarpon [3,[5][6][7][8]. Fungi belonging to the Rhizoctonia genus represent a wide range of pathogenic, non-pathogenic and mutualistic species [9].…”

Section: Introductionmentioning

confidence: 99%

“…Fungi belonging to the Rhizoctonia genus represent a wide range of pathogenic, non-pathogenic and mutualistic species [9]. Most studies on this group of fungi, known to attack more than 200 different species of plants, relate to agricultural plants, while only few researchers have studied this group of organisms in forest nurseries [4,6,[10][11][12][13][14][15][16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Characteristics and diversity of Rhizoctonia spp. population in soil of selected forest bare-root nurseries in Poland

Bełka

Mańka

2014

Acta Mycol

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Fourty three Rhizoctonia isolates obtained from four forest nurseries situated in the Wielkopolska region (central-western Poland) has been proved as multinucleate (anamorph – R. solani). They represented four anastomosis groups (AG): AG1-IC, AG-5, AG4-HG2 and AG2-1. Three AGs were found in Jarocin nursery (AG-5, AG4-HG2 and AG2-1), two in Łopuchówko (AG-5 and AG4-HG2) and one in Konstantynowo (AG1-IC) and Pniewy (AG-5). All isolates were highly pathogenic to Scots pine (Pinus sylvestris) seedlings and pose a large damping-off threat to the seedlings in the nurseries with single AG and in those where more AGs exists.

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Studies on anastomosis groups of Rhizoctonia solani isolates causing disease in two forest nurseries in Poland

Cited by 14 publications

References 42 publications

Characterization and pathogenicity of Rhizoctonia isolates associated with cauliflower in Belgium

Characterization and pathogenicity of Rhizoctonia isolates associated with cauliflower in Belgium

Modelling disease spread and control in networks: implications for plant sciences

Characteristics and diversity of Rhizoctonia spp. population in soil of selected forest bare-root nurseries in Poland

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