Alternaria carotiincultae E. G. Simmons, Mycotaxon

Tao, Ya Qun, Jia, Guo Geng, Aung, Sein Lai Lai, Wu, Qing Li, Lu, Hong Xue & Deng, Jian Xin, 2019, Multigene phylogeny and morphology of Alternaria reveal a novel species and a new record in China, Phytotaxa 397 (2), pp. 169-176 : 171-172

Alternaria carotiincultae E. G. Simmons, Mycotaxon 55:103 (1995). Figs. 2 A–E

Descriptions:— Colonies on PDA white to buff at the edge, saffron near center; buff to salmon, gradually dark brick in centre of reverse; velvety, effuse, 52‒56 mm diam. after 7 days at 25 ºC. Conidiophores erecting solitary or terminally from fertile hyphae, straight or curved, pale brown to dark brown, with short side branches bearing a single conidium or small clumps of dark conidia, commonly 20‒50 × 4‒6 μm with 1‒3 septa, secondary conidiophores normally short fistulous. Conidia 35‒50 × 10‒20(‒24) μm (x = 36.7 × 16.4 μm, n =50) in size, solitary or 1‒3 in a chain in conidial clump derived from one conidiophores, short or long ovoid, long ellipsoid, smooth wall, yellowish brown to dark brown, with 3‒6 transverse, and 0‒2 longitudinal or oblique between septa.

Materials examined:— China, Sichuan Province, Chengdu City, Wenjiang District, Herb Garden of Chengdu University of Traditional Chinese Medicine, from leaf spot and blight of Ligusticum chuanxiong , 19 May. 2015, Q. Y. Tao & J.X. Deng, deposited by Q. Y. Tao, living culture YZU 151039.

Notes:— Alternaria carotiincultae has been isolated from Daucus carota in Australia, USA, Japan, Netherlands and New Zealand ( Park et al. 2008). It is the first report of the species from Ligusticum chuanxiong in China. The species is distinct from A. radicina because there is no tendency to become obovoid which kind of conidia is popular in A. radicina ( Simmons 2007) . A. carotiincultae grows more rapidly than A. radicina on PDA or APDA and produces conidia with more transverse septa ( Park et al. 2008). In addition, the two species are closely related could be differentiated based on phylogenetic analysis of EF-1a, β- tubulin, and Alt a1 gene ( Park et al. 2008), but also ATPase gene (the present study). A small-spored Alternaria , A. ligustici is reported from the same host ( Zhang 2003). However, it is distint to A. carotiincultae by producing catenulate obclavate conidia (2‒3 conidia per chain on host).

Figures

FIGURE 2. Morphology of Alternaria carotiincultae YZU 151039 from Ligusticum chuanxiong. A: colony on PDA. B–D: sporulations on PCA. E: conidia. Scale bars = 20 mm.