Structural variation in sexual reproductive bodies in the members of oömycetes

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Print ISSN : 0970-4078.
Online ISSN : 2229-4473.
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Doi: 10.1007/s42535-022-00471-7
First Page: 275
Last Page: 293
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Keywords: Oömycetes, Sexual reproductive bodies, Aquatic, Terrestrial, Amphibious forms


An up-to-date information on the variability in sexual reproductive bodies in the members of oömycetes, viz., the nature, structure and the variation in oögonia, antheridia, oöspheres and oöspores; has been discussed and reviewed. Besides other genera belonging to Oömycota, seven additional genera (recently described), viz., Halophytophthora, Newbya, Phytopythium, Calycofera, Salisapilia, Nothophytophthora and Girishia have also been taken into consideration in this review. On the basis of variability in sexual reproductive bodies, the oömycetes have been categorized into four basic groups: purely aquatic forms, purely terrestrial forms and the two amphibious forms, firstly, the aquatic amphibious those which are aquatic and exhibit transitional terrestrial characters and secondly, terrestrial amphibious those which are terrestrial and show certain reminiscent aquatic features.

Oömycetes, Sexual reproductive bodies, Aquatic, Terrestrial, Amphibious forms

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Bala K, Robideau GP, Lévesque CA, de Cock AWAM, Abad ZG, Lodhi AM, Shahzad S, Ghaffar A, Coffey MD (2010) Phytopythium Abad, de Cock, Bala, Robideau, Lodhi and Lévesque, gen. nov. and Phytopythium sindhum Lodhi, Shahzad and Levésque, sp. nov. Persoonia 24:136–137

Barksdale AW (1963) The role of hormone A during sexual conjugation in Achlya ambisexualis. Mycologia 55(5):627–632

Beakes GW, Gay JL (1977) Gametangial nuclear division and fertilization in Saprolegnia furcata as observed by light and electron microscopy. Trans Brit Mycol Soc 69:459–471

Beakes GW, Gay JL (1978a) Light and electron microscopy of oöspore maturation in Saprolegnia furcata: I. cytoplasmic changes. Trans Brit Mycol Soc 71:11–24

Beakes GW, Gay JL (1978b) Light and electron microscopy of oöspore maturation in Saprolegnia furcata: II. Wall development. Trans Brit Mycol Soc 71:25–35

Bennett RM, Thines M (2020) An overview on Philippine estuarine oömycetes. Philippine Jour Syst Biol 14(1):1–14

Bennett RM, de Cock AWAM, Lévesque CA, Thines M (2017) Calycofera gen. nov an estuarine sister taxon to Phytopythium, Peronosporaceae. Mycol Progress 16(10):947–954

Butler RL (1975) A photomicrographic guide to the Saprolegniaceae of illinois, Master’s Thesis accepted by Eastern Illinois University (USA), pp. 120.

Carlile MJ (1996) The discovery of fungal sex hormones: II. Antheridiol. Mycologist 10(3):113–117

Cook WR, Morgan E (1934) Some observations on the Saprolegniaceae of the soils of Wales. Jour Bot 72:345–349

Dick MW (1995) Sexual reproduction in Peronosporomycetes. Can Jour Bot 73(Suppl. 1):712–724

Dick MW (1999) Classification of the Peronosporomycetes. In: Robinson R, Batt C, Patel P (eds) Encyclopaedia of food microbiology, vol 2. Academic Press, London, pp 871–882

Dick MW (2001) The Peronosporomycetes. In: Lemke M (ed) Mycota VII part A. Systematics and evolution. Springer-Verlag, Berlin, Heidelberg, pp 39–72

Fletcher J (1978) Timing of events during oöspore genesis in Saprolegnia diclina. Trans Brit Mycol Soc 70:417–422

Ho HH, Jong SC (1990) Halophytophthora gen. nov., a new member of the family Pythiaceae. Mycotaxon 36(2):377–382

Howard KL (1971) Oöspore types in the Saprolegniaceae. Mycologia 63:679–686

Howard KL, Moore RT (1970) Ultra structure of oögenesis in Saprolegnia terrestris. Bot Gaz 131:311–336

Hüberli D, Tommerup IC, Hardy GEJ (1997) The role of paragynous and amphigynous antheridia in sexual reproduction of Phytophthora cinnamomi. Mycol Res 101(11):1383–1388

Hulvey J, Telle S, Nigrelli L, Lamour K, Thines M (2010) Salisapiliaceae – a new family of oömycetes from marsh grass litter of south-eastern North America. Persoonia 25:109–116

Inaba S, Tokumasu S (2002) The genus Brevilegnia (Saprolegniales, Oomycetes) in Japan. Mycoscience 43:0059–0066

Jesus ALD, Marano AV, De Souza JI, James TY, Jeronimo GH, Rocha SCO, Goncalves DR, Boro MC, Pires-Zottarelli CLA (2015) Achlya catenulata sp. nov. a new Saprolegniales (Oomycetes, Straminipila) from Brazilian mangrove swamp. Phytotaxa 212(3):221–228

Johnson TW, Jr, Seymour RL and Padgett DE (2002) Biology and systematics of the Saprolegniaceae,

Manton I (1952) The fine structure of plant cilia. Symp Soc Exp Biol 6:306

Manton I (1965) Some phyletic implications of flagellar structure in plants. In: Preston RD (ed) Advances in botanical research, vol 2. Academic Press, London, New York

Markovskaja S (2004) Saprolegniaceae (Peronosporomycetes) in Lithuania I. The genera Achlya and Newbya. Bot Lith 10(2):141–160

McMorris TC (1978) Antheridiol and oögoniols, steroid hormones which control sexual reproduction in Achlya. Phil Trans R Soc Lond B 284:459–470

Mirzaee MM, Abbasi M, Mohammadi M (2009) Albugo candida causing white rust on Erysimum crassicaule in Iran. Aust Plant Dis Notes 4(1):124–125

Novaes-Ledieu M, Jimenez-Martinez A, Villanueva JR (1967) Chemical composition of hyphal wall of phycomycetes. J Gen Microbiol 47:237

Paul B (1999) Pythium ornacarpum: a new species with ornamented oögonia isolated from soil in France. FEMS Microbiol Lett 180:337–344

Paul B (2000) ITS1 region of the rDNA of Pythium megacarpum sp. nov., its taxonomy, and its comparison with related species. FEMS Microbiol Lett 186:229–233

Paul B (2003) Characterization of a new species of Pythium isolated from a wheat field in northern France and its antagonism towards Botrytis cinerea causing the grey mould disease of grapevine. FEMS Microbiol Lett 224:215–223

Paul B (2006) A new species of Pythium isolated from a vineyard in France. FEMS Microbiol Lett 263:194–199

Paul B, Bala K (2008) A new species of Pythium with inflated sporangia and coiled antheridia, isolated from India. FEMS Microbiol Lett 282:251–257

Paul B, Steciow MM (2008) Achlya spiralis, a new aquatic oömycete with bent oögonial stalks, isolated from the Burgundian region of France. FEMS Microbiol Lett 284:120–125

Paul B, Galland D, Masih I (1999) Pythium prolatum isolated from soil in the Burgundy region: a new record for Europe. FEMS Microbiol Lett 173:69–75

Paul B, Mathew R, Kanak B, Paul A, Henry M, Lefort F, Belbahri L (2008) Morphology, taxonomy, and phylogenetic analysis of a new species of Pythium isolated from France. Fungal Divers 28:55–63

Prabhuji SK (1984a) Studies on some watermoulds occurring in certain soils of Gorakhpur. Jour Ind Bot Soc 63:387–396

Prabhuji SK (1984b) Distribution of watermoulds within quadrats in the soils of Gorakhpur. Proc Nat Acad Sci India 54:21–32

Prabhuji SK (2005) Occurrence and Phenology of the oömycetes with special reference to Saprolegniaceae. In: Mukerji KG, Tilak KVBR, Reddy SM, Gangawane LV, Prakash P, Kunwar IK (eds) Frontiers in plant sciences. I.K. International Pvt. Ltd., New Delhi, pp 129–142

Prabhuji SK (2010) Sexual reproduction in water moulds - I: general aspects related to family Saprolegniaceae. Int Jour Pl Repro Biol 2(1):17–30

Prabhuji SK (2011) The interdependence of watermoulds occurring in water and soil habitats affecting their population density, distribution and periodicity. Trop Ecol 52(3):311–324

Prabhuji SK (2013) Aquatic oömycetology: a new field of research. Botanica 62–63:27–43

Prabhuji SK (2018) Watermoulds form part of terrestrial ecosystem in a transition from aquatic to soil habitat. Clim Chang Environ Sustain 6(2):89–98

Prabhuji SK (2020) Watermoulds: heterotrophs that constitute a significant part of aquatic ecosystem. RASSA J Sci Soc 2(1):34–40

Prabhuji SK (2021) Variability in reproductive morphology of family saprolegniaceae and its significance. Vegetos 34(1):1–12

Raper JR (1939) Sexual hormones in Achlya I. Indicative evidence for a hormonal coordinating mechanism. Am J Bot 26(8):639–650

Raper JR (1940) Sexual hormones in Achlya II. Distance reactions conclusive evidence for a hormonal coordinating mechanism. Am J Bot 27(3):162–173

Raper JR (1940) Sexuality in Achlya ambisexualis. Mycologia 32(6):710–727

Raper JR (1942) Sexual hormones in Achlya III. Hormone A and the initial male reaction. Am J Bot 29(2):159–166

Riethmüller A, Kellner K, Langer E (2007–2008) Species of Saprolegniales in water and soil samples of moist areas declared as laminar natural monuments by the administrative district of Kassel, Germany with special consideration of species occurring on amphibians. Philippia 13:83–92

Spencer MA, Vick MC, Dick MW (2002) Revision of aplanopsis, pythiopsis, and subcentric. Achlya species (Saprolegniaceae) using 18S rDNA and morphological data. Mycol Res 106(5):549–560

Steciow MM (2001) Achlya fuegiana, a new species from Tierra del Fuego Province (Argentina). Mycologia 93(6):1195–1199

Turian G (1962) Cytoplasmic differentiation and dedifferentiation in the fungus Allomyces. Protoplasma 54:323

Vogel HJ (1960) Two modes of lysine synthesis among lower fungi: evolutionary significance. Biochem Biophys Acta 41:172



Author Information

Prabhuji Shakti K.
Biotechnology and Molecular Biology Centre, M.G. Post Graduate College, Gorakhpur, India