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Evidence of occurrence of barley crown rust caused by Puccinia coronata var. hordei and sexual reproduction of the pathogen under field conditions in China

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论文信息: Evidence of occurrence of barley crown rust caused by  Puccinia coronata  var.  hordei  and sexual reproduction of the pathogen under field conditions in China. Tian, X. X., Yao, Q., Zhang, Z. D., Cheng, X. R., Qin, J. F, Kang, Z. S.*, and Zhao, J.*. Plant Disease, 2021, doi: https://doi.org/10.1094/PDIS-09-20-2029-RE

JCR分区Q1,中科院大类二区,Top期刊,IF: 4.438

论文摘要:Crown rust of barley, caused by  Puccinia coronata var.  hordei ( Pch ), was first reported by Jin and Steffenson in 1992, and the fungus has been reported only in the United States and Hungary. In China, stripe, stem, and leaf rusts have been reported on barley, but not for crown rust. Recently, a sample (HZJ0004) of rust collected from barley in Qilian county, Qinghai, China, appeared different from the three rusts based on color, size, arrangements of uredinia and/or telia. Teliospores had crown-shaped appendages on the top. Based on the disease symptoms and morphology of urediniospores and teliospores, the fungus was identified as  Pch. Using the internal transcribed spacer sequences, the isolates HZJ0004 from barley and POR3 from buckthorn ( Rhamnus sp.) were clustered in one clade with  Pch  isolates from barley and  Elymus repens but in a different clade from the isolate POC8 from wild oat and the varieties of  P. coronata  from oats and grasses. At the seedling stage, most of the tested cultivars of barley and rye were susceptible to  Pch isolates HZJ0004 and POR3, but the cultivars of oats, triticale, wheat, and the most grasses of  Aegilops ,  Brachypodium ,  Bromus ,  Calamagrostis ,  Deschampsia , Elymus ,  Festuca , and  Phleum  were resistant, indicating their host specialization on barley. This is the first report of crown rust on barley in China.

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