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Identification of Heterodera schachtii on sugar beet in Xinjiang Uygur Autonomous Region of China
PENG Huan, LIU Hui, GAO Li, JIANG Ru, LI Guang-kuo, GAO Hai-feng, Wu Wei, WANG Jun, Zhang Yu, HUANG Wen-kun, KONG Ling-an, PENG De-liang
2022, 21 (6): 1694-1702.   DOI: 10.1016/S2095-3119(21)63797-8
Abstract258)      PDF in ScienceDirect      
The sugar beet cyst nematode, Heterodera schachtii, is a major parasite of sugar beet which has been recognized and listed as a quarantine nematode in China and more than 20 countries and regions worldwide.  A survey for important nematodes was undertaken in the sugar beet planting area of China during 2015–2018, and numerous cysts were collected from sugar beet fields in Xinyuan County, Xinjiang Uygur Autonomous Region of China.  The observations of morphological and morphometric characteristics revealed that cysts, vulval cones and second-stage juveniles of the Xinjiang population were in the same range of each other and within those of other reported H. schachtii populations.  Molecular analysis of rDNA-ITS, 28S-D2/D3 and mtDNA cytochrome c oxidase subunit 1 (COI) gene sequences suggested that the Xinjiang population clustered in a branch with those foreign populations, and the sequence similarity was as high as 99.81–100%.  Moreover, this result was confirmed by PCR assay with species-specific primer SHF6 and rDNA2 of H. schachtii, and the pathogenicity test confirmed successful Xinjiang population reproduction in both plant hosts.  In conclusion, based on morphological and molecular characterization, this study confirmed that the cyst nematode population collected from sugar beet fields in Xinjiang is H. schachtii.  As far as we know, this is the first report of H. schachtii on sugar beets in Xinjiang, China.
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The TaFIM1 gene mediates wheat resistance against Puccinia striiformis f. sp. tritici and responds to abiotic stress
SHI Bei-bei, WANG Juan, GAO Hai-feng, ZHANG Xiao-juan, WANG Yang, MA Qing
2021, 20 (7): 1849-1857.   DOI: 10.1016/S2095-3119(20)63276-2
Abstract144)      PDF in ScienceDirect      
Fimbrin, a regulator of actin cytoskeletal dynamics that participates in numerous physiological and biochemical processes, controls multiple developmental processes in a variety of tissues and cell types.  However, the role of fimbrin in pathogen defense of wheat and the mechanisms have not been well studied.  Here, we investigated that the expression of TaFIM1 gene of wheat was significantly induced in response to avirulent race of Puccinia striiformis f. sp. tritici (Pst) and silencing of TaFIM1 by virus-induced gene silencing method.  The results show that silencing of TaFIM1 resulted in a reduction of resistance against the stripe rust indicated by both phenotypes and a histological examination of Pst growth.  Additionally, the expression level of TaFIM1 gene was up-regulated under abiotic stresses.  These findings suggest that TaFIM1 functions as a positive regulator of pathogen resistance of wheat plants and response to abiotic stress.  Our work may show new light on understanding the roles of fimbrin in wheat. 
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