Pustula junggarensis B. Xu & Z. D. Jiang, 2016

Xu, Biao, Song, Jiage, Xi, Pinggen & Jiang, Zide, 2016, Pustula junggarensis (Albuginales, Oomycota), a new species of white blister rust on Takhtajaniantha pusilla from Junggar Basin in China, Phytotaxa 289 (1), pp. 83-87 : 84-85

publication ID

https://doi.org/ 10.11646/phytotaxa.289.1.7

DOI

https://doi.org/10.5281/zenodo.13647137

persistent identifier

https://treatment.plazi.org/id/03B6E934-FF85-5C55-4BD9-44ECFD5CFD07

treatment provided by

Felipe

scientific name

Pustula junggarensis B. Xu & Z. D. Jiang
status

sp. nov.

Pustula junggarensis B. Xu & Z. D. Jiang View in CoL , sp. nov. Fig.1 View FIGURE 1

MycoBank no.:—MB817737

Etymology:—the new species in named after the location Junggar Basin where the pathogen was collected.

Holotype:— CHINA, Xinjiang, South Mountain of Manas County (N 44 o 57’56”, E 86 o 05’17”), on Takhtajaniantha pusilla (Pall.) Nazarova , 18 April 2016, coll. B. Xu and J. G. Song, HMUT T-1601 . Sequences ex holotype: GenBank KX 589297 for cox2 mtDNA and KX589300 for ITS nrDNA. GoogleMaps

Additional collections examined (paratypes):— CHINA, Xinjiang, Shihezi County (N 44 o 14’17”, E 86 o 02’46”), on Takhtajaniantha pusilla , 19 April 2016, coll. B. Xu and J. G. Song, HMUT 16022 GoogleMaps ; Shawan County (N 44 o 29’53”, E 85 o 37’82”), on Takhtajaniantha pusilla , 21 April 2016, coll. B. Xu and J. G. Song, HMUT 16023 .

Description: Mycelium intercellular. Sori covered by the epidermis of leaves and stems, distinct, round or irregular, often confluent, 1–2 mm diam., white to yellowish, mature sporangia dispersed through ruptured epidermis of the host plant ( Figs 1A, 1B View FIGURE 1 ). Sporangiophores hyaline, clavate or cylindrical, straight to slightly curved ( Fig. 1D View FIGURE 1 ), 35.5–55.6 μm long 13.2–14.8 μm wide, bearing sporangia in chains. Sporangia hyaline, primary sporangia depressed, (15.7)17.6–24.3(29.6) μm (av. 22.6 μm) × (15.1)17.6–21.6(24.8) μm (av. 18.7 μm) with wall of 1.8–3 μm thickenss (n=150), secondary sporangia subglobose, (15.3)18.2–21.8(23.4) μm (av. 20.9 μm) × (14.9)16.2–20.3(21.2) μm (av. 18.5 μm) with annulus of 1.5–2.3 μm thickness (n=120) ( Fig. 1C View FIGURE 1 ). Oogonia globose to subglobose, 66.5–87.2 μm in diameter ( Fig. 1G View FIGURE 1 ). Antheridia single ( Fig. 1G View FIGURE 1 ), elongated 20–31 μm long, 6–12 μm wide. Oospores yellowish to dark reddish-brown, globose to subglobose ( Fig. 1F View FIGURE 1 ), (45.4)54.6–65.4(68.5) μm (av. 62.5μm) in diameter (n=102), inner walls on average 2.7 μm thick (n=70), outer wall on average 5.2 μm thick (protuberances included) (n=85), protuberances 2.1–3.0 μm high, pattern reticulate with areolae 2.1–4.8 μm wide (n=75) ( Fig. 1E View FIGURE 1 ).

Phylogenetic analyses

The GenBank BLAST search of the pathogen sequences showed that the Pustula junggarensis on Takhtajaniantha pusilla belonged to Pustula . Based on the molecular phylogenetic trees generated from the ML, ME and BI analyses of the cox 2 mtDNA regions, sequences of the three P. junggarensis specimens formed an independent clade with supports of 99, 97 and 0.99, respectively ( Fig. 2 View FIGURE 2 ). The clade of the new pathogen was separated but sister to Pustula obtusata with supports of 96, 56, and 0.83, respectively. The ITS sequence data of these specimens were deposited in GenBank, but not analysed by phylogenetic approaches.

B

Botanischer Garten und Botanisches Museum Berlin-Dahlem, Zentraleinrichtung der Freien Universitaet

J

University of the Witwatersrand

G

Conservatoire et Jardin botaniques de la Ville de Genève

Kingdom

Chromista

Phylum

Oomycota

Class

Peronosporea

Order

Albuginales

Family

Albuginaceae

Genus

Pustula

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