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Hyaloperonospora drabae

Detail Info

Scientific Name Hyaloperonospora drabae (Gäum.) Y.J. Choi, H.D. Shin & Voglmayr, Mycopathologia 171:155 (2011)
Synonyms ≡ Peronospora drabae Gäum., Beih. bot. Zbl., Abt. 1 35(1): 524 (1918)
Disease Downy mildew
Taxonomic Rank
Order Peronosporales Family Peronosporaceae
Host Plant
Common Name Wood Whitlowgrass (꽃다지) Scientific Name Draba nemorosa
Species thumbnail
Distribution Finland, Korea
Characteristics Lesions commonly present on leaves, stems, peduncles and fruits, causing discolouration of the tissues and deformation of the attacked organs. Down whitish, consisting of scattered conidiophores to dense, felt-like. Haustoria lobate, up to 22 μm long, up to 10 μm wide, filling the host cell partly to almost completely. Conidiophores colourless, stout, straight, (178–)216.6–254.7–292.8(–400) μm long (n = 60); trunk mostly straight, (70–)120–205(–350) μm long (n = 65), variable in width, 8–14 μm wide below the first branch, 9– 15 μm wide above the base, mostly with somewhat swollen base up to 18 μm wide; callose plugs mostly absent but very rarely present near the base; branching upper part monopodially or sub-dichotomously branched 5–7 times. Ultimate branchlets in pairs or rarely single, flexuous to sigmoid, (9.1–)10.7–12.8–15.0(–16.5) μm long, (1.4–)1.5–1.9–2.2(–2.5) μm wide at the base (n = 30), apex obtuse. Conidia hyaline, subglobose to broadly ellipsoidal, (13.8–)15.2–16.4–17.6(–18.8) μm long, (12.5–)12.7–13.5–14.2(–15.5) μm wide, l/w ratio (1.10–)1.16–1.22–1.28(–1.35) (n = 30), greatest width median, base and tip round; pedicel absent in most conidia but a scar visible at the point of attachment; producing germ tubes. Resting organs oogonia globose to irregular, golden or pale yellowish (43–)48.8–55–61.3(–64) μm diam. (n = 50), wall mostly smooth, 2.5–7 μm thick; oospores plerotic to aplerotic, globose, (23–)28.6–32–35.3(–37) μm diam. (n = 50), wall smooth, 2.5–3.5 μm thick.
Notes Hyaloperonospora drabae is a host-associated downy mildew of Draba nemorosa. Choi et al. (2011) demonstrated that it is phylogenetically distinct from H. norvegica, which can also infect D. nemorosa in Korea, and transferred both taxa to Hyaloperonospora. The name H. drabae was stabilized using authentic Finnish material from D. nemorosa. Historical North American material from D. reptans has not been molecularly verified and may represent a different lineage.
Economic importance Draba nemorosa is primarily a wild plant, and no significant economic losses caused by H. drabae have been reported.
References Choi, Y. J., et al. 2011. Mycopathologia 171:151.
Gäumann, E. A. 1918. Beihefte zum Botanischen Centralblatt 35:395.
Lee, J. S., et al. 2017. Mycobiology 45:139.