Trichoderma nordicum G.Z. Zhang, 2022
publication ID |
https://dx.doi.org/10.3897/mycokeys.87.76085 |
persistent identifier |
https://treatment.plazi.org/id/DE284B67-F384-59E0-92E8-05DCBFD3BCE4 |
treatment provided by |
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scientific name |
Trichoderma nordicum G.Z. Zhang |
status |
sp. nov. |
Trichoderma nordicum G.Z. Zhang sp. nov.
Fig. 5 View Figure 5
Etymology.
“nord” means found in the north of China.
Holotype.
China, Beijing, Yu-yuan-tan Park, 43 m (altitude), isolated from soil, 27 October 2016, G.Z. Zhang (Holotype WT 13001), ex-type culture ACCC 39713.
Diagnosis.
Phylogenetically Trichoderma nordicum is related to T. paratroviride , but the sequence similarities of rpb2 and tef1 -α were 98.15% and 94.43%, respectively. That does not meet the sp ∃!(rpb2 99≅ tef1 97) standard for T. paratroviride or other known Trichoderma species. Morphologically, conidiophores of T. paratroviride consisting of a main axis and often distantly-spaced side branches, not re-branching. Conidiophores of T. nordicum are branched in a more complex manner; conidia are larger than those of T. paratroviride .
Teleomorph.
Unknown.
Growth optimal at 25 °C, slow or limited at 30 °C, absent at 35 °C. Colonies grew fast on PDA, CMD and MEA and slow on SNA. Colony radius after 72 h at 25 °C 67-71 mm on PDA, 68-71 mm on CMD, 51-55 mm on MEA and 21-24 mm on SNA. Aerial mycelia sparse on PDA after 72 h at 25 °C under 12 h photoperiod and conidiation developed within 48 h beginning at the inoculation point and progressed around, grey-white at first and slowly turning green. Diffusing pigment or distinctive odour absent. Aerial mycelia sparse and flocculence on MEA after 72 h at 20 °C under 12 h photoperiod. Conidia developed within 48 h beginning near the colony margin on MEA, grey-white at first and slowly turning green, transparent liquid secreted. Aerial mycelia few on SNA and CMD after 72 h at 25 °C, conidia formed around the inoculation point and in distinct concentric rings after 96 h under 12 h photoperiod on SNA and CMD, diffusing pigment not produced. Conidiophores and branches narrow and flexuous, tending to be regularly verticillate forming a pyramidal structure, each branch terminating in a cruciate whorl of up to five phialides. Phialides, lageniform, (6.2-)7.2-10.3(-12.9) × (2.6-)2.9-3.2(-3.4) μm (mean = 8.8 × 3.1 μm), 1.6-2.3 μm (mean = 1.9 μm) near the base; phialide length/width ratio (2.1-)2.4-3.4(-4.3) (mean = 2.9). On PDA, phialides curved, distinguished from those on other media. Conidia, globose to obovoidal, (4.1-)4.4-4.8(-5.0) × (4.0-)4.1-4.4(-4.6) μm (mean = 4.6 × 4.3 μm), length/width ratio 1.0-1.2 (mean = 1.1). Chlamydospores sometimes present, (8.7-)9.8 × 10.4(-12.5) μm.
Distribution.
China, Beijing and Hebei.
Additional specimen examined.
China. Hebei, Bai-yang Lake, 19 m (altitude), isolated from soil, 15 September 2016, J.S. Li (WT 61001).
Notes.
Phylogenetically, Trichoderma nordicum is related to T. paratroviride (Fig. 1 View Figure 1 ), but the sequence similarities of rpb2 and tef1 -α were 98.15% and 94.43%, respectively. That does not meet the sp ∃!(rpb2 99≅ tef1 97) standard for T. paratroviride or other known Trichoderma species. Morphologically, conidiophores of T. paratroviride consist of a main axis and often distantly-spaced side branches, not re-branching. Conidiophores of T. nordicum are branched in a more complex manner; conidia are larger than those of T. paratroviride ( Jaklitsch and Voglmayr 2015).
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