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Some Additions to Powdery Mildews (Erysiphales: Fungi) of Northwestern Himalayas

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Some Additions to Powdery Mildews (Erysiphales: Fungi) of Northwestern Himalayas NUSANTARA BIOSCIENCE ISSN: 2087-3948 Vol. 9, No. 1, pp. 52-56 E-ISSN: 2087-3956 February 2017 DOI: 10.13057/nusbiosci/n090109 Short Communication: Some additions to powdery mildews (Erysiphales: Fungi) of Northwestern Himalayas AJAY KUMAR GAUTAM1,♥, SHUBHI AVASTHI2 1School of Agriculture, Faculty of Science, Abhilashi University. Mandi, Himachal Pradesh-175028, India. Tel.: +91-9459923654, ♥email:[email protected] 2Department of Botany, Abhilashi Institute of Life Sciences. Mandi, Himachal Pradesh-175008, India Manuscript received: 12 May 2016. Revision accepted: 16 January 2017. Abstract. Gautam AK, Avasthi S. 2017. Short Communication: Some additions to powdery mildews (Erysiphales: Fungi) of Northwestern Himalayas. Nusantara Bioscience 9: 52-56. During the regular mycological collections, between October to December 2015 in North-West Himalayas of Himachal Pradesh, four powdery mildews parasitic on higher plants were gathered. After study they were found to be Pseudoidium cryptolepidis on Cryptolepis buchanani, Erysiphe trifoliorum on Trifolium repentis, Podosphaera xanthii on Coreopsis lanceolata and Podosphaera euphorbiae-hirtae on Euphorbia hirta. All the powdery mildew fungi are additions to Himachal Pradesh as well as north-west Himalayas. Keywords: Erysiphales, higher plants, Himachal Pradesh, India INTRODUCTION 2009; Braun and Cook 2012; Gautam 2014, 2015), revealed that no record of these fungi were from Himachal Powdery mildews are obligate and biotropic fungal Pradesh. These are illustrated and described here in this parasites responsible to infect a variety of hosts such as, study. agricultural crops, vegetables, trees, herbs, shrubs, grasses, many ornamental plants and even weeds also. These fungi are appeared as white powder on infected surfaces and MATERIALS AND METHODS grows well in environments with high humidity and moderate temperatures (Huang 2000), such favorable Sample collection conditions are well established in Himachal Pradesh, India. The samples were collected during the Many researchers worked a lot and still in continuation on phytopathological survey of the Mandi District of powdery mildew fungi of the North Western Himalayas Himachal Pradesh, India in the year 2015. Mandi, is a well- including Himachal Pradesh, but Paul and Thakur (2006) known region of Himachal Pradesh and popular for its carried out a comprehensive study and compiled it in the fertile land, plain and hilly regions. form of a monograph “Indian Erysiphaceae”. It is The infected plant parts were dried between sheets of estimated that about 100 species of powdery mildews blotting paper and preserved for further studies. The host belonging to genera Arthrocladiella, Blumeria, Erysiphe, plants were identified by matching the collections with Farmanomyces, Leveillula, Microsphaera, Oidopsis, herbarium and consulting botanists. The specimens are Oidium, Phyllactinia, Pleochaeta, Podosphaera, deposited at Abhilashi University (AUMH) Mandi, Sphaerotheca, Uncinula and Uncinuliella (Jamaluddin et Himachal Pradesh, India for further reference. al. 2004; Paul and Thakur 2006, Hosagoudar and Agarwal 2009) are reported so far from Himachal Pradesh. Morphological examinations This paper is in continuation with our previous studies The white mycelium on infected leaves were examined on some powdery mildews from Himachal Pradesh, India primarily with a hand-lens and then with a dissecting (Gautam 2014, 2015). During the routine mycological microscope to illustrate the disease symptoms in detail. A surveys in the district Mandi of Himachal Pradesh, some piece of clear adhesive tape was placed on infected leaves, powdery mildew were found infecting different species of stripped off and then placed on a microscopic slide with higher plants viz.: Pseudoidium cryptolepidis on one drop of clear distilled water. The microscopic Cryptolepis buchanani, Erysiphe trifoliorum on Trifolium observations were made under oil immersion by standard repentis, Podosphaera xanthii Coreopsis lanceolata and light microscopy to note down characters of mycelium Podosphaera euphorbiae-hirtae on Euphorbiae-hirta. The (epiphyllous, hypophyllous or amphigenous; color; literature consulted (Bilgrami et al. 1991; Jamaluddin et al. density), conidia (single or in chains; shape, size, surface), 2004; Paul and Thakur 2006; Hosagoudar and Agarwal conidiophores (size, shape and size of the foot-cells; GAUTAM & AVASTHI – Some additions to powdery mildews of Northwestern Himalayas 53 number, size and arrangement of the following cells) and but no report from any other part of the country (Paul and appressoria (shape). Camera Lucida drawings were also Thakur 2006; Hosagoudar and Agarwal 2009). prepared to support the final confirmation of fungi. An Olympus light microscope was used to examine fungal Erysiphe trifoliorum structures. Standard literature (Paul and Thakur 2006; Erysiphe trifoliorum (Wallr.) U. Braun, Mycotaxon 112: Hosagoudar and Agarwal 2009; Braun and Cook 2012, 175, 2010. Figures 2.A-B. Jamaluddin et al. 2004) was consulted for identification. ≡ Alphitomorpha trifoliorum Wallr., Ann. For name of powdery mildew MycoBank Wetterauischen Ges. Gesammte Naturk., N.F., 4: 238, (www.mycobank.org) and Species Fungorum 1819. (www.speciesfungorum.org) were consulted. Material examined: Parasitic on leaf surfaces of Trifolium repentis L., Tanda, Mandi, 760 meters (2,495 ft), Himachal Pradesh, India, 26 October 2015, Gautam, RESULTS AND DISCUSSION AUMH 1031. Mycelium white, amphigenous, effuse or in patches, Four powdery mildews collected are illustrated and later covering the whole leaf surface, persistent or described here along with the discussion about their evanescent; hyphae branched, 2.75-4.1μm wide; taxonomic position. moderately lobed to multilobed hyphal appressoria, solitary or in opposite pairs, 3.85-7.1μm in size; conidiophores Enumeration of the species arising from the upper part of running hyphae or mother cells, erect, up to 110μm long, wide; foot-cells straight, Pseudoidium cryptolepidis cylindrical, sometimes very slightly flexuous, measuring Pseudoidium cryptolepidis (Hosag., Vijay, Udaiyan & about 12.1-40.3× 4.4-7.2μm, followed by (1-)2(-4) shorter Siddappa) U. Braun & R. T. A. Cook, Taxonomic Manual to or cells of about the same length, forming conidia singly; of the Erysiphales (Powdery Mildews) Biodiversity Series conidia ellipsoid to doliiform, about 18.7-36.3×12.1- 11: 604 (2012). Figures 1.A-B. 16.5μm; germ tubes variable, terminal or almost so, long, = Oidium cryptolepidis Hosag., Vijay, Udaiyan & 0.25-4.5 μm (median 1-1.25 μm ). No chasmothecium was Manian, New Botanist 18(3-4): 241, 1991. observed. Material examined: Parasitic on leaf surfaces of Distribution: Erysiphe trifoliorum showed a wide host Cryptolepis buchanani Roem & Schult., Tanda, Mandi, range namely, Acacia, Albizia, Amorpha, Anthyllis, 760 meters (2,495 ft), Himachal Pradesh, India, 4 Chamaecytisus, Coronilla, Cytisus, Dorycnium, Genista, November 2015, Gautam, AUMH 1030. Gueldenstaedtia, Hippocrepis, Lathyrus, Lembotropis, Mycelium white, mostly epigenous, superficial, effuse Lotus, Melilotus, Onobrychis, Ononis, Psoralea, or in irregular patches, and later covering the whole leaf Sarothamnus, Scorpiurus, Securigera, Tephrosia, surface; hyphae substraight to wavy, branched, 2.65-4.3μm Tetragonolobus, Trifolium, Trigonella, Wisteria from wide; moderately lobed to multilobed hyphal appressoria, Africa, America, Australia, New Zealand and Asia. solitary or in opposite pairs, 4.4-6.6μm in size; Comments: Trifolium sp. is parasitized by many conidiophores arising from the upper part of running powdery mildew fungi like Microsphaera trifolii (Grev.) hyphae or mother cells, erect, variable in length, up to Braun, Microsphaera trifolii, var. trifolii, Erysiphe pisi DC. 110μm long, wide; foot-cells straight, cylindrical, very and Uncinuliella flexuosa (Peck.) Braun. Two powdery slightly flexuous and bulbous at the base, about 12.1-40.7× mildew namely. Microsphaera trifolii (Grev.) Braun, M. 4.5-7μm long, followed by 1-2 shorter to longer cells, trifolii, var. Trifolii are synonyms for Erysiphe trifoliorum. forming conidia singly; conidia vacuolated, ellipsoid to The present fungus differs from Erysiphe pisi where doliiform, cylindrical, 23.1-35.2×11-14.3μm. No conidia are ellipsoid-cylindrical and bigger (25-55 × 10-22 chasmothecium was observed. μm) in size. Uncinuliella flexuosa, another powdery Distribution: The fungus has been reported only from mildew fungus found on Trifolium sp. showed close Tamil Nadu (India), but no report from any other part of similarity with present species in anamorphic structures, the country (Paul and Thakur 2006; Hosagoudar and but found variable in size of conidiophores (60-150 μm Agarwal 2009). long). Another point of differentiation was, uncinuloid Comments: The powdery mildew on Cryptolepis appendages on chasmothecia in Uncinuliella flexuosa, buchanani caused by Pseudoidium cryptolepidis has however, no chasmothecium was observed in Erysiphe recognised as Oidium cryptolepidi on the basis of trifoliorum. anamorphic characters of mycelium, well-developed lobed to multilobed hyphal appressoria and swollen basal cell of Podosphaera xanthii conidiophore and without distinct fibrosin bodies (Paul and Podosphaera xanthii (Castagne) U. Braun & Shishkoff, Thakur 2006; Hosagoudar and Agarwal 2009). However, Schlechtendalia 4: 31, 2000. Figures 3.A-B. Braun and Cook (2012) revised this fungus as Pseudoidium ≡ Erysiphe xanthii Castagne, Cat. Pl. Marseille:
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