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Systematics and Taxonomy of the Arbuscular Endomycorrhizal Fungi (Glomales)- a Possible Way Forward C Walker

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Systematics and Taxonomy of the Arbuscular Endomycorrhizal Fungi (Glomales)- a Possible Way Forward C Walker Systematics and taxonomy of the arbuscular endomycorrhizal fungi (Glomales)- a possible way forward C Walker To cite this version: C Walker. Systematics and taxonomy of the arbuscular endomycorrhizal fungi (Glomales)- a possible way forward. Agronomie, EDP Sciences, 1992, 12 (10), pp.887-897. hal-00885447 HAL Id: hal-00885447 https://hal.archives-ouvertes.fr/hal-00885447 Submitted on 1 Jan 1992 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Mycorrhizae Systematics and taxonomy of the arbuscular endomycorrhizal fungi (Glomales) - a possible way forward C Walker Forestry Commission, The Forestry Authority, Northem Research Station, Roslin, Midlothian EH25, 9SY, UK (COST Meeting, 21-23 May 1992, Dijon, France) Summary — The identification of plants belonging to mycorrhizal symbioses is easy, but that of the fungal partners is in an underdeveloped state. The history of the taxonomy of the Glomales is presented here, including that of genera, species, types. This taxonomy can nowadays be based upon phylogeny and morphological, ontogenic, biological, mo- lecular and genetic studies. taxonomy / endomycorrhiza / fungus Résumé — Systématique et taxonomie des Glomales. La possibilité d’un bond en avant. L’identification des plantes appartenant à une symbiose mycorrhizienne est aisée mais celle du champignon partenaire est encore délicate à cause de l’état de sous-développement de la taxonomie de ces champignons. L’histoire de la taxonomie des Glomales est ici présentée, incluant la présentation des genres, des espèces et des types. Cette taxonomie peut aujourd’hui se baser sur la phylogénie et sur des études morphologiques, ontogéniques, biologiques moléculaires et génétiques. taxonomie / endomycorhize / champignon INTRODUCTION 1990), but they must have a sound biological base. Because the arbuscular-mycorrhizal fungi in the Glomales have not been The justification for an article on taxonomy in a yet successfully journal edition dedicated to tissue culture and cultured axenically, they are usually grown in mycorrhizas is 2-fold. Firstly, tissue culture tech- pots with plants. The pots are normally open to the and the substrate is sterile for niques may help to solve some of the problems elements, only with systematics and taxonomy of arbuscular a short time at best. Advances in tissue culture mycorrhizal fungi. Secondly, it is vital in the (in particular, in transformed root organ culture) study of any symbiosis that equal attention be have allowed species of arbuscular mycorrhizal paid to the identity of all partners; identification fungi to be grown in vitro, permitting detailed ob- of the plant in an arbuscular mycorrhizal partner- servations on the development of spores and ship is relatively easy, whereas the present un- other structures (Bécard and Piché, 1989). derdeveloped state of taxonomy of the myco- There are presently = 130 species recognised bionts tends to lead to misidentification and con- in the Glomales (Walker and Trappe, 1992). fusion. Different fungi can have markedly differ- More than 65 had been described by 1983; but ent effects on plant growth, and its is "... impor- taxonomic concepts have advanced (eg Walker, tant that... (they)... be correctly identified, 1983; Morton, 1987), and only a few have been particularly in those experiments pertaining to re-described using modern concepts and termi- the possible agricultural exploitation of their ben- nology (eg Koske and Walker, 1985; Walker and eficial effects..." (Hall, 1987). Koske, 1987). Consequently, matching new col- Taxonomy and systematics are essential un- lections with old descriptions often leads to insur- derpinnings to the work of the biologist (Burdsall, mountable difficulties in identification. HISTORICAL The first revision of the Endogonaceae sensu lato was published long before their symbiotic re- The order Endogonales formalised by Benjamin lationships were understood (Thaxter, 1922). Af- ter the of the between ar- (1979) had a single family, the Endogonaceae, recognition relationship buscular and the of some of containing the zygosporic Endogone, as well as mycorrhizas spores the then a new the arbuscular mycorrhizal fungi, and some other Endogone spp (Mosse, 1953), phase of and Bowen, genera since classified as belonging elsewhere descriptive (Mosse 1968) and taxonomic and Nicolson, (table I). From this, the order Glomales was de- (Gerdemann 1963) work almost 20 in the fined to encompass only fungi either known or began, culminating, yr ago, seminal work on the in the Pacif- presumed to form arbuscular mycorrhizae with Endogonaceae ic Northwest Al- plants (Morton and Benny, 1990). The order En- (Gerdemann and Trappe, 1974). as a local it es- dogonales now contains only 2 genera, Endo- though published merely survey, tablished the foundations which taxonomic gone and Sclerogone still in the one family, the upon Endogonaceae. The remainder of the species in concepts are still largely based. the Endogonales sensu lato were transferred to The taxonomy of fungi in the Glomales is 3 families in the Glomales (table I). The Endogo- founded principally on the structure of their nales, consequently, have come to be of re- spores or sporocarps. This has been criticised on duced importance to plant scientists, even the grounds that the "whole fungus" approach though at least 2 Endogone spp form ectomycor- would be preferable (Walker, 1985), but it ap- rhizae with conifers. Their relationship with the pears that theoretically some of this criticism was Glomales is uncertain, but is unlikely to be close. unfounded, since spore morphology is genetical- This paper is intended to deal only with the fungi ly disconnected from other perhaps more plastic that have the potential to form arbuscular mycor- aspects of these fungi (Morton, 1990a). The ap- rhizal symbioses, and therefore there will be no parent simplicity of spore structure might seem to further discussion of the Endogonales sensu be a barrier to creating a workable taxonomy, but stricto, except in a historical context. as many as 115 character states (though not all associated with spores) have been used in sep- arating species of the Endogonales sensu lato (Hall, 1983). Such characters were used to con- struct a dichotomous key (Hall and Fish, 1979) and later a synoptic key (Trappe, 1982). Unfortu- nately, both keys inevitably suffered from being based partly on descriptions in the literature. The progress of taxonomic ideas has resulted in an increasing reliance on some characteristics such as spore wall structure (Walker, 1983) and a re- duction in emphasis on others such as sporocarp production, appearance of spore contents, and reaction to stains such as cotton blue (Morton, 1988). Because of this, many of the older de- scriptions are inadequate and comparisons with new collections are difficult. Theoretically, exami- nation of type specimens should solve this prob- lem, but many are in such a poor state of preser- vation that they are of little use. The keys were often based, therefore, on incomplete and some- times erroneous data. In a discussion of the taxonomy and phyloge- ny of the Endogonales sensu lato, Berch (1986) pointed out some areas of controversy, and sug- gested potentially fruitful research topics. She criticised some of the terminology (eg, walls (Walker, 1983); sporiferous saccule (Walker et al, 1984)), although her proposed alternatives did not find wide acceptance. The most recent sum- mary of the characteristics used in species de- examination of authenticated material, kindly scription is very thorough (Morton, 1988). It pro- sent to me by Dr Warcup shows it to fit with the vides an excellent synthesis of previous work, current phenotypic concept of the genus Glo- and gives a foundation for descriptions and re- mus. Comparison of this species with arbuscular descriptions of fungi in the Glomales. Since its mycorrhizal fungi through the use of molecular publication more than 24 additional new species techniques would be enlightening. have been described and (Walker Trappe, 1992), Only a small proportion of the > 130 species and new characteristics have been introduced from among the 6 genera currently included in such as re- the fluorescence of spore walls after the Glomales (Walker and Trappe, 1992), are action with a stilbene fluorochrome (Giovannetti actually known to be mycorrhizal. Many were de- et al, 1991). scribed from field collected material. Others were from mixed species open-pot cultures, and therefore mycorrhizal associations are assumed THE GLOMALES rather than known. The unifying characteristic of the order is defined TAXONOMY as the ability to form arbuscular mycorrhizas. It must be questioned whether such a character can validly define an order. Steussy (1992) discussed the current state of The ectomycorrhizal habit has evolved several systematics in the Glomales, and concluded that times, and can be found amongst fungi from all 3 there were 5 areas requiring particular attention. classes, Zygomycetes, Ascomycetes and Basidi- These were the development
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