Contribution to the identification of Cercospora species in Iran * Cercospora

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Rostaniha 11(2): 183-189 (2010) (1389) 183-189 :(2)11 Contribution to the identification of Cercospora species in Iran * Cercospora Received: 15.11.2010 / Accepted: 26.12.2010 M. Pirnia : Ph.D. student, Islamic Azad University, Science & Research Branch, Tehran, Iran (E-mail: pirnia@ymail.com) R. Zare: Research Prof., Department of Botany, Iranian Research Institute of Plant Protection, P.O. Box 1454, Tehran 19395, Iran H.R. Zamanizadeh: Associate Prof., Islamic Azad University, Science & Research Branch, Tehran, Iran A. Khodaparast: Associate Prof., Department of Plant Protection, University of Guilan, Rasht, Iran Abstract Eight species of the genus Cercospora from different localities in Northern provinces of Iran were obtained and examined during spring-autumn 2010. Cercospora acnidae (from Amaranthus chlorostachys var. chlorostachys), C. beticola (from Beta vulgaris), C. iridis (from Iris sp.), C. lactucae-sativae (from Lactuca sativa), C. mercurialis (from Mercurialis annua), C. sorghi (from Sorghum halepense) and C. zonata (from Vicia faba) were identified. Furthermore, C. apii is identified from Abutilon theophrasti, Euphorbia heterophylla, Solanum lycopersicum, Pelargonium zonale, Vigna sinensis and Zanthedeschia aethiopica. Among these, C. acnidae, C. apii, C. iridis, and C. mercurialis are new records and Sorghum halepense is new host for C. sorghi in Iran. Keywords: New record, fungi, host plant, leaf spot 1389/10/5 : /1389/8/24 : : (E-mail: pirnia@ymail.com) : 19395 1454 : : Cercospora Cercospora acnidae. 1389 C. lactucae-sativae C. iridis C. beticola C. zonata Amaranthus chlorostachys var. C. sorghi C. mercurialis Lactuca sativa Iris sp. Beta vulgaris chlorostachys Vicia faba Sorghum halepense Mercurialis annua Cercospora apii. Euphorbia heterophylla Abutilon theophrasti Pelargonium zonale Solanum lycopersicum. Zanthedeschia aethiopica C. apii C. acnidae Vigna sinensis C. mercurialis C. iridis Sorghum halepense. C. sorghi : *

184 / 184 Pirnia et al. / Contribution to the identification of Cercospora species / Rostaniha 11(2), 2010 Introduction Species of the hyphomycetous genus Cercospora Fresen. are associated with leaf spot diseases on a wide range of host plants (Ellis 1976, Crous & Braun 2003). Many Cercospora species produce a phytotoxic metabolite called cercosporin which was initially thought to be produced only by true Cercospora species (Fajola 1978), and those species not producing this toxin belong to other morphologically similar genera. Chupp (1954) in a monograph of the genus Cercospora listed over 1800 species names. In a major taxonomic treatment of the genus, Deighton (1967 79) segregated and reclassified many Cercospora species into several genera, including Cercosporella, Cercosporidium, Paracercospora, Pseudocercospora, Pseudocercosporella and Pseudocercosporidium. Cercospora species are characterized by having acicular, hyaline and septate conidia with a conspicuous hilum produced on pigmented, unbranched, septate and smooth conidiophores (Braun 1995, 1998). Crous & Braun (2003) published an annotated check-list of Cercospora and Passalora Fr. with 5720 taxa and taxonomic re-allocation of numerous species. Recently Braun & Crous (2007) described several new species, new combinations and new names after re-examination of type collections of Cercospora species and other related genera. Iranian records of Cercospora species have only been poorly studied. Ershad (1990, 2000, 2002) reported four Cercospora species from Iran. Scharif & Ershad (1966) presented a list of fungi on various host plants where also a few Cercospora species are named. Ershad (2009) listed 59 including 14 uncertain species of the genus Cercospora in his book 'Fungi of Iran'. Taxonomy of the genus Cercospora and other similar fungi have changed in recent decades, new species, combinations, names and nomenclatural clarifications have been introduced, therefore, taxonomic revision of this genus in Iran seems to be necessary. Materials and Methods Specimens with leaf spot symptoms from different localities in the north of Iran, including Guilan, Mazandaran and Golestan provinces were collected during spring-autumn 2010. Some specimens were also provided by others. Potato Dextrose Agar (PDA) and Malt-extract Agar (MA) were used in order to grow the fungi. Conidia and stromata were streaked onto the media directly using a sharp sterilized needle under a binocular. No growth was occurred on these media after a month. Microscopic slides were prepared from stromata, conidiophores and conidia in 25% lactic acid. Characters such as, presence or absence of stromata and their development, pigmentation of conidia, conidiophores, conidiogenous loci (scars) and conidiogenous cells were used to identify the species. Drawings were made using a drawing tube attached to an Olympus BH-2 microscope. Results and Discussion Eight foliicolous Cercospora species, four of which being new records to Iran, were identified. From the species Cercospora beticola, C. lactucae-sativae, C. sorghi and C. zonata are reported from Iran (see Ershad 2009), therefore, these species are not illustrated here and only their host and locality are mentioned. All collected specimens are deposited in the fungus reference collection of the Ministry of Jihad-e-Agriculture (IRAN) at the Iranian Research Institute of Plant Protection, Tehran. 1. Cercospora acnidae Ellis & Everh., Proc. Acad. Nat. Sci. Philadelphia 43: 89 (1891) Leaf spots circular to subcircular, numerous, brown to blackish-brown with grey centre and red margin, 2 7 mm in diameter, sometimes coalescing into large area; caespituli amphigenous, mostly epiphyllous, punctiform; stromata small to fairly prominent, brown, 20 35 µm wide; conidiophores in small fascicles, 5 10 stalks, arising from stromata, brown, paler and attenuated towards the tip, multiseptate, erect, geniculate in the upper part, not branched, smooth, thin, 60 110 3 5 µm; conidiogenous cells integrated, terminal and intercalary, 20 45 µm in length; conidial scars

Pirnia et al. / Contribution to the identification of Cercospora species / Rostaniha 11(2), 2010 185/ 185 conspicuous, thickened and darkened, terminal and lateral, 1.5 2 µm wide; conidia formed singly, hyaline, acicular, straight to slightly curved, smooth, thin, multiseptate, 5 11 septa, base truncate, tip acute to subacute, 45 100 2 3.5 µm; hilum thickened and darkened, 1 2.5 µm wide (Fig. 1). Specimen examined: On Amaranthus chlorostachys Willd. var. chlorostachys, Golestan province, Shastkola forest, 8 Nov. 2010, coll.: M. Pirnia & R. Zare (IRAN 15015 F). Chupp (1954) introduced C. brachiata on Amaranthus spp. in his monograph that is morphologically similar to C. apii, therefore, Crous & Braun (2003) merged the species into C. apii and provided another species Cercospora acnidae on Amaranthus that was originally isolated from Acnida cannabina and A. commons (Amaranthaceae). Morphology of the specimen examined fit well with Cercospora acnidae provided by Chupp (1954). 2. Cercospora apii Fresen., Beitr. Mycol. 3: 91 (1863) Leaf spots subcircular to irregular, at first yellowish-brown, later dark-brown, margin indefinite or surrounded by brown or dark reddish-brown border, scattered on leaf surface, mostly 5 12 mm in diameter; stromata lacking to well-developed, composed of swollen hyphal cells, subglobose to irregular, brown to olivaceous-brown, 10 50 µm wide; caespituli amphigenous, mostly hypophyllous, punctiform; conidiophores solitary or in small to moderately large fascicles, loose to dense, mostly arising from stromata, erect, straight, subcylindrical or basal part cylindrical and upper fertile part slightly to strongly geniculate-sinuous, medium dark-brown to pale-brown, paler near the apex, unbranched, smooth, thin-walled, septate, 20 250 4 7 µm; conidiogenous cells integrated, terminal or intercalary, occasionally unilocal, determinate, but usually multilocal, sympodial, 10 70 µm in length; conidiogenous loci conspicuous, thickened and darkened, terminal and lateral, sometimes inconspicuous; conidia solitary, short conidia often cylindrical or obclavatecylindrical, developed long conidia acicular, hyaline to olivaceous, straight to curved, smooth, thin-walled, multiseptate, 3 20 transverse septa, base truncate, tip acute to subacute, 40 250 2 5 µm; hilum thickened and darkened, 2 4 µm wide (Fig. 2). Fig. 1. Cercospora acnidae on Amaranthus chlorostachys var. Chlorostachys: A. Conidiophores, B. Conidia, C. Symptoms on leaf (Bar = 50 µm).

186 / 186 Pirnia et al. / Contribution to the identification of Cercospora species / Rostaniha 11(2), 2010 Fig. 2. Cercospora apii on Abutilon theophrasti: A. Conidiophores, B. Conidia, C. Symptoms on leaf (Bar = 50 µm). Among Cercospora species, C. apii is the oldest available name comprising of a large complex of morphologically indistinguishable taxa. Chupp (1954) stated that species of Cercospora are generally hostspecific and described a large number of species based on host species. Crous & Braun (2003) believed that some Cercospora isolates on various host plants are morphologically indistinguishable and introduced C. apii s. lat. and linked 83 host genera to C. apii. Groenewald et al. (2006) revealed that morphology, host specificity and geographical location are not suitable characters in order to resolve the C. apii species complex. In this study, C. apii studied from six new host plants in Iran. Specimens examined: On Abutilon theophrasti Medic., Golestan province, Shastkola forest, 8 Nov. 2010, coll.: M. Pirnia & R. Zare (IRAN 15016 F); on Euphorbia heterophylla L., Golestan province, Gorgan, 10 Nov. 2010, coll.: M. Pirnia & R. Zare (IRAN 15018 F); on Solanum lycopersicum Mill., Guilan province, Astaneh Ashrafieh, 24 June 2010, coll.: M. Pirnia (IRAN 15019 F); on Pelargonium zonale Medic., Guilan province, Sume'e-Sara, 25 June 2010, coll.: M. Pirnia (15020 F); on Vigna sinensis (L.) Endl., Guilan province, Astaneh Ashrafieh, 24 June 2010, coll.: M. Pirnia (IRAN 14808 F); Guilan province, Sume'e-Sara, 25 June 2010, coll.: M. Pirnia (15021 F); Mazandaran province, Babol, 12 Sept. 2010, coll.: M.A. Aghajani (IRAN 15022 F); on Zanthedeschia aethiopica (L.) Spreng., Guilan province, Some'e-Sara, 15 July 2007, coll.: A. Khodaparast (IRAN 14807 F). 3. Cercospora iridis Chupp, A monograph of the fungus genus Cercospora: 260 (1954) Leaf spots irregular, elongated, centre white, margin surrounded by brown or dark reddish-brown border, 10 30 mm in diameter; stromata present, subglobose to irregular, brown, 35 45 µm wide; caespituli hypophyllous, punctiform; conidiophores in small fascicles, arising from stromata, erect, cylindrical, upper part geniculate to sinuous, brown to pale-brown, paler and sometimes narrower towards the tip, unbranched, smooth, thin-walled, 0 1 septate, 10 50 3 5 µm; conidiogenous cells integrated, terminal, 7 15 µm in length; conidiogenous loci inconspicuous to slightly conspicuous; conidia solitary, obclavate-cylindrical, olivaceous brown, straight to slightly curved, smooth, thin-walled, 1 5 transverse septa, base truncate, tip rounded to obtuse, 15 40 7 10 µm; hilum darkened, 2 3 µm wide (Fig. 3). Specimen examined: On Iris sp. Guilan province, Bandar Anzali, 25 June 2010, coll.: M. Pirnia (IRAN 15025 F).

Pirnia et al. / Contribution to the identification of Cercospora species / Rostaniha 11(2), 2010 187/ 187 Fig. 3. Cercospora iridis on Iris sp.: A. Conidiophores, B. Conidia, C. Symptoms on leaf (Bar = 50 µm). Cercospora iridis has characteristic short conidiophores and obclavate-cylindrical conidia (Crous & Braun 2003). Chupp (1954) described this species with acicular and hyaline conidia, but specimen examined in this study has obclavatecylindrical and olivaceous brown conidia similar to that reported by Crous & Braun (2003). 4. Cercospora mercurialis Pass., Mycoth. Univ., No. 783 (1877) Leaf spots circular to irregular, pale-brown with a brown line border, yellowish grey centre, 2 8 mm in diameter; stromata present, small, substomatal, brown, 20 35 µm wide; caespituli amphigenous, mostly hypophyllous, punctiform; conidiophores in small fascicles, 3 8 stalks, arising from stromata, through stomata, pale-brown to brown, erect, geniculate to sinuous, not branched, rarely dichotomously branched in the upper part, smooth, thin, irregular in width, narrower towards the tip, aseptate or sparingly septate, (12 )15 67 2.5 5 µm; conidiogenous cells integrated, terminal, sometimes conidiophores reduced to conidiogenous cells, (12 )15 63 µm in length; conidial scars conspicuous, thickened and darkened, terminal and lateral, 1 2 µm wide; conidia formed singly, hyaline, cylindrical or rarely acicular, straight to slightly curved, smooth, thin, indistinctly multiseptate, base subtruncate to obconically truncate, tip mostly obtuse, 47 100 2.5 5 µm; hilum thickened and darkened, 1 2 µm wide (Fig. 4). Specimen examined: On Mercurialis annua L., Golestan province, Gorgan, 11 May 2010, coll.: M. Pirnia (IRAN 14809 F). Morphology of the specimen examined agrees with the description provided by Chupp (1954). The species is distinguished from C. apii by moderately short and dichotomously branched conidiophores. This is the first report of this species from Iran.

188 / 188 Pirnia et al. / Contribution to the identification of Cercospora species / Rostaniha 11(2), 2010 Fig. 4. Cercospora mercurialis on Mercurialis annua: A. Conidiophores, B. Conidia, C. Symptoms on leaf (Bar = 50 µm). 5. Cercospora beticola Sacc., Nuovo Giorn. Bot. Ital. 8: 189 (1876) Specimens examined: On Beta vulgaris L., Golestan province, Gorgan, 10 May 2010, coll.: M. Pirnia (IRAN 15023 F); Mazandaran province, Behshahr, 9 May 2010, coll.: M. Pirnia (IRAN 15024 F); Mazandaran province, Babol, 12 Sep. 2010, coll.: M.A. Aghajani (IRAN 15017 F). Chupp (1954) characterized C. beticola mainly by moderately short conidiophores with almost hyaline tips and with one to several mild geniculations near the tip. Because of similar morphological characteristics, Crous & Braun (2003) redisposed C. beticola as a synonym of C. apii s. lato. However, Groenewald et al. (2006) showed that, C. apii and C. beticola s. stricto form two well-defined clades and, therefore, are probably two distinct species. Their data was obtained from a wide range of host plants. Our results from Iranian specimens classified under C. beticola shows that they have moderately short conidiophores, obclavate-cylindrical conidia identical to the description provided by Chupp (1954) for C. beticola. Cercospora beticola has previously been reported from various localities in Iran during 1946 1973 (Ershad 2009). 6. Cercospora lactucae-sativae Sawada, Rep. Gov. Agric. Res. Inst. Taiwan 35: 111 (1928) Specimen examined: On Lactuca sativa L., Golestan province, Gorgan, 11 Nov. 2010, coll.: M. Pirnia & R. Zare (IRAN 15026 F). Cercospora lactucae-sativae was originally published as a synonym of Cercospora longissima by Chupp (1954). Crous & Braun (2003) introduced C. lactucae-sativae on Lactuca species and corrected C. longissima as a synonym of C. lactucae-sativae. Collections initially examined in Iran were published as C. longissima. Recently, Ershad (2009) has changed the name C. longissima to C. lactucae-sativae in his book 'Fungi of Iran'. 7. Cercospora sorghi Ellis & Everh., J. Mycol. 3: 15 (1887) Specimen examined: On Sorghum halepense (L.) Pers., Guilan province, Astaneh Ashrafieh, 24 June 2010, coll.: M. Pirnia (IRAN 15027 F)

Pirnia et al. / Contribution to the identification of Cercospora species / Rostaniha 11(2), 2010 189/ 189 Morphology of the specimen examined agrees with the description of C. sorghi given by Chupp (1954). The species has already been reported from Sorghum bicolor (L.) Moench in Iran (Ershad 2009) and this is its first report from Sorghum halepense. 8. Cercospora zonata G. Winter, Hedwigia 23: 191 (1884) Specimens examined: On Vicia faba L., Mazandaran province, Sari, 9 May 2010, coll.: M. Pirnia (IRAN 15028 F); Golestan province, Gorgan, 12 May 2010, coll.: M. Pirnia (IRAN 15029 F) Morphology of the specimens examined agrees with the description provided by Chupp (1954) and Ellis (1976). Collections were already examined in Iran published as C. fabae by Scharif & Ershad (1966) and as C. zonata by Hedjaroude (1976) without any description or illustration. Ershad (2009) has also listed C. zonata on Vicia faba. Acknowledgement Dr. M.A. Aghajani is thanked for providing some specimens. Mrs B. Djavadi and S. Sajedi are thanked for identification of host plants. References Braun, U. 1995. A monograph of Cercosporella, Ramularia and allied genera (phytopathogenic Hyphomycetes), Vol. 1. IHW Verlag, Eching. Braun, U. 1998. A monograph of Cercosporella, Ramularia and allied genera (phytopathogenic Hyphomycetes), Vol. 2. IHW-Verlag, Eching. Braun, U. & Crous, P.W. 2007. The diversity of cercosporoid hyphomycetes: new species, combinations, names and nomenclatural clarifications. Fungal Diversity 26: 55 72. Chupp, C. 1954. A monograph of the fungus genus Cercospora. Ithaca, New York. Published by the author. Crous, P.W. & Braun, U. 2003. Mycosphaerella and its anamorphs: 1. Names published in Cercospora and Passalora. CBS Biodiversity Series 1: 1 569. Deighton, F.C. 1967. Studies on Cercospora and allied genera. II. Passalora, Cercosporidium and some species of Fusicladium on Euphorbia. Mycological Papers 112: 1 80. Deighton, F.C. 1973. Studies on Cercospora and allied genera. IV. Cercosporella Sacc., Pseudocercosporella gen. nov. and Pseudocercosporidium gen. nov. Mycological Papers 133: 1 62. Deighton, F.C. 1974. Studies on Cercospora and allied genera. V. Mycovellosiella Rangel and a new species of Ramulariopsis. Mycological Papers 137: 1 75. Deighton, F.C. 1976. Studies on Cercospora and allied genera. VI. Pseudocercospora Speg. Pantospora Cif. and Cercoseptoria Petr. Mycological Papers 140: 1 168. Deighton, F.C. 1979. Studies on Cercospora and allied genera. VII. New species and redispositions. Mycological Papers 144: 1 56. Ellis, M.B. 1976. More Dematiaceous Hyphomycetes. CMI, Kew, England. Ershad, D. 1990. New records of two Cercospora species for Iran. Iran. J. Plant Pathol. 26: 41. Ershad, D. 2000. Two new species of mitosporic fungi. Rostaniha 1: 1 9. Ershad, D. 2002. A new Cercospora species from Iran. Rostaniha 3: 47 50. Ershad, D. 2009. Fungi of Iran. Iranian Research Institute of Plant Protection, Tehran. Fajola, A.O. 1978. Cercosporin, a phytotoxin from Cercospora spp. Physiol. Plant Pathol. 13: 157 164. Groenewald, M., Groenewald, J.Z., Braun, U. & Crous, P.W. 2006. Host range of Cercospora apii and C. beticola and description of C. apiicola, a novel species from celery. Mycologia 98: 275 285. Hedjaroude, Gh.A. 1976. Report on some form-species of imperfect fungi of Caspian Sea area. Iran. J. Plant Pathol. 12: 89 94. Scharif, G. & Ershad, D. 1966. A list of fungi on cultivated plants, shrubs and trees of Iran. Ministry of Agriculture, Plant Pests and Diseases Research Institute, Evin, Tehran.

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