Phylogenetic placement and host specificity of mycorrhizal isolates belonging to AG-6 and AG-12 in the <i>Rhizoctonia solani</i> species complex

Pope, Elizabeth J.; Carter, Dee

doi:10.1080/00275514.2001.12063202

Cited by 22 publications

(14 citation statements)

References 24 publications

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“…since the mid-1990s (Boysen et al 1996;Kuninaga et al 1997;Johanson et al 1998;Boidin et al 1998;Salazar et al 1999;Kuninaga et al 2000a,b;Pope and Carter 2001;Carling et al 2002;Toda et al 2004). Currently, the DNA sequence information seems to offer the most accurate way for establishing the taxonomic and phylogenetic relationships for Rhizoctonia spp.…”

Section: Rdna Sequence Analysismentioning

confidence: 94%

“…Similarly, the rDNA-ITS sequence analysis most accurately divided subgroups within AG 1 (Kuninaga et al 1997;Toda et al 2004), AG 3 (Kuninaga et al 2000a), AG 4 (Boysen et al 1996;Kuninaga et al 1997), and AGs 6 (Pope and Carter 2001). The mycorrhizal isolates belonging to AGs 6 and 12 were placed on separate clusters in the tree, despite their functional similarities; these AGs are likely to have a separate evolutionary background.…”

Section: Rdna Sequence Analysismentioning

confidence: 95%

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The advancing identification and classification of Rhizoctonia spp. using molecular and biotechnological methods compared with the classical anastomosis grouping

et al. 2006

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Anamorphic classification of Rhizoctonia spp. has been based on young cell nuclear numbers and hyphal fusion to anastomosis groups (AGs), in addition to the teleomorph classification. The widespread development of molecular biology techniques has added modern tools to support classification of organisms according to their genetics and evolutionary processes. These various methods have also been used in recent years for classification of Rhizoctonia. Data are continuously accumulating in the literature and the sequences in databases, which are readily available for researchers in the network systems. In the present review, attempts were made to describe and compare the advantages and disadvantages of the various methods for the classification of Rhizoctonia spp. Currently, the rDNAinternal transcribed spacer (ITS) sequence analysis seems to be the most appropriate method for classification of Rhizoctonia spp. Data of all the appropriate multinucleate Rhizoctonia (MNR) accumulated in GenBank were analyzed together in neighbor-joining (NJ) and maximumparsimony (MP) trees supplemented with percent sequence similarity within and among AGs and subgroups. Generally, the clusters of the isolate sequences were supportive of the AGs and subgroups based on hyphal fusion anastomosis. The review also indicates inaccuracies in designation of sequences of some isolates deposited in GenBank. The review includes detailed analyses of the MNR groups and subgroups, whereas complementary descriptions of the binucleate Rhizoctonia (BNR), uninucleate Rhizoctonia (UNR), and comprehensive interrelationships among all the currently available MNR, BNR, and UNR groups and subgroups in GenBank are to be discussed in a subsequent review article.

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Section: Rdna Sequence Analysismentioning

confidence: 94%

Section: Rdna Sequence Analysismentioning

confidence: 95%

The advancing identification and classification of Rhizoctonia spp. using molecular and biotechnological methods compared with the classical anastomosis grouping

et al. 2006

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“…Bootstrap support was calculated using MP and Neighbor-Joining (NJ) analysis. Thanatephorus cucumeris (GenBank AF153778 from soybean in Japan; Pope and Carter, 2001) was used as the outgroup for the fungal sequences (Otero et al, 2002(Otero et al, , 2004.…”

Section: Methodsmentioning

confidence: 99%

Widespread mycorrhizal specificity correlates to mycorrhizal function in the neotropical, epiphytic orchid Ionopsis utricularioides (Orchidaceae)

Otero

Flanagan²,

Herre³

et al. 2007

American J of Botany

118

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Tropical orchids constitute the greater part of orchid diversity, but little is known about their obligate mycorrhizal relationships. The specificity of these interactions and associated fungal distributions could influence orchid distributions and diversity. We investigated the mycorrhizal specificity of the tropical epiphytic orchid Ionopsis utricularioides across an extensive geographical range. DNA ITS sequence variation was surveyed in both plants and mycorrhizal fungi. Phylogeographic relationships were estimated for the mycorrhizal fungi. Orchid functional outcomes were determined through in vitro seed germination and seedling growth with a broad phylogenetic representation of fungi. Most fungal isolates derived from one clade of Ceratobasidium (anamorphs assignable to Ceratorhiza), with 78% within a narrower phylogenetic group, clade B. No correlation was found between the distributions of orchid and fungal genotypes. All fungal isolates significantly enhanced seed germination, while fungi in clade B significantly enhanced seedling growth. These results show that I. utricularioides associates with a phylogenetically narrow, effective fungal clade over a broad distribution. This preference for a widespread mycorrhizae may partly explain the ample distribution and abundance of I. utricularioides and contrasts with local mycorrhizal diversification seen in some nonphotosynthetic orchids. Enhanced orchid function with a particular fungal subclade suggests mycorrhizal specificity can increase orchid fitness.

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“…Molecular systematics has substantially advanced the taxonomy of Rhizoctonia spp. (Vilgalys and González, 1990;Cubeta and Vilgalys, 1997;Kuninaga et al, 1997;Salazar et al, 2000;González et al, 2001) and orchid mycorrhizae Bruns, 1997, 1999;Pope and Carter, 2001;Kristiansen et al, 2001), mostly based on nuclear ribosomal internal tran- Cameron et al (1999) and Freudenstein and Chase (2001). b Based on Ackerman (1995).…”

mentioning

confidence: 99%

“…scribed spacer (ITS) sequences. Pope and Carter (2001) studied ITS sequences of Rhizoctonia solani AGs including orchid mycorrhizal fungi from Australia. Kristiansen et al (2001) amplified rDNA from terrestrial orchids of Europe and North America and sequenced a tropical mycorrhizal fungus from Asia.…”

mentioning

confidence: 99%

Diversity and host specificity of endophytic Rhizoctonia‐like fungi from tropical orchids

Otero

Ackerman

Bayman

2002

American J of Botany

230

206

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All orchids have an obligate relationship with mycorrhizal symbionts. Most orchid mycorrhizal fungi are classified in the form-genus Rhizoctonia. This group includes anamorphs of Tulasnella, Ceratobasidium, and Thanatephorus. Rhizoctonia can be classified according to the number of nuclei in young cells (multi-, bi-, and uninucleate). From nine Puerto Rican orchids we isolated 108 Rhizoctonia-like fungi. Our isolates were either bi- or uninucleate, the first report of uninucleate Rhizoctonia-like fungi as orchid endophytes. We sequenced the internal transcribed spacer (ITS) region of nuclear ribosomal DNA from 26 isolates and identified four fungal lineages, all related to Ceratobasidium spp. from temperate regions. Most orchid species hosted more than one lineage, demonstrating considerable variation in mycorrhizal associations even among related orchid species. The uninucleate condition was not a good phylogenetic character in mycorrhizal fungi from Puerto Rico. All four lineages were represented by fungi from Tolumnia variegata, but only one lineage included fungi from Ionopsis utricularioides. Tropical epiphytic orchids appear to vary in degree of specificity in their mycorrhizal interactions more than previously thought.

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Phylogenetic placement and host specificity of mycorrhizal isolates belonging to AG-6 and AG-12 in the Rhizoctonia solani species complex

Cited by 22 publications

References 24 publications

The advancing identification and classification of Rhizoctonia spp. using molecular and biotechnological methods compared with the classical anastomosis grouping

The advancing identification and classification of Rhizoctonia spp. using molecular and biotechnological methods compared with the classical anastomosis grouping

Widespread mycorrhizal specificity correlates to mycorrhizal function in the neotropical, epiphytic orchid Ionopsis utricularioides (Orchidaceae)

Diversity and host specificity of endophytic Rhizoctonia‐like fungi from tropical orchids

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