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Waxy allele diversity in waxy maize landraces of Yunnan Province, China
WU Xiao-yang, LONG Wen-jie, CHEN Dan, ZHOU Guo-yan, DU Juan, WU Shao-yun, CAI Qing
2022, 21 (2): 578-585.   DOI: 10.1016/S2095-3119(20)63471-2
Abstract286)      PDF in ScienceDirect      
Waxy maize is one of the main fresh-eating maize types, and a mutation of the waxy gene causes the waxy character of maize grains.  China is rich in waxy maize landraces, and Yunnan and its surrounding areas, are the place of origin and genetic diversity center of Chinese waxy maize.  The six known waxy alleles of Chinese waxy maize are wx-D7, wx-D10, wx-Cin4, wx-124, wx-Reina, and wx-Xuanwei.  The mutation sites of these alleles all occur in the coding region of the waxy gene, however, the mechanism by which the waxy characteristic is caused by the mutation in the regulatory region has only been reported rarely in maize.  In this study, 405 waxy maize landraces from Yunnan were used as materials to identify the insertion and deletion of a large sequence fragment in the upstream ~3.5 kb regulatory region of the waxy gene by molecular marker detection.  Three different waxy alleles were identifed in this study: wx-PIF/Harbinger, wx-hAT and wxElote2.  These three types of mutations all represented transposons inserted into the regulatory region of the waxy gene.  Wx-PIF/Harbinger was a 304-bp MITE class transposon insertion belonging to the PIF/Harbinger family, while wx-hAT was a 560-bp MITE class transposon insertion belonging to the hAT family, and wx-Elote2 was a 6 560-bp LTR-like transposon insertion.  In this study, the alleles were identifed for more than 70% of the waxy maize landraces in Yunnan, which provids a basis for the utilization of these waxy maize landraces.
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Monilinia fructicola on loquat: An old pathogen invading a new host
YIN Liang-fen, ZHANG Shu-qin, DU Juan, WANG Xin-yu, XU Wen-xing, LUO Chao-xi
2021, 20 (7): 2009-2014.   DOI: 10.1016/S2095-3119(20)63375-5
Abstract128)      PDF in ScienceDirect      
Monilinia fructicola has been widely reported as the causal agent of brown rot disease on many Rosaceae family fruits worldwide.  It has been reported on stone fruits, e.g., peach, plum, cherry, apricot and mume; as well as pome fruits, e.g., apple, pear and hawthorn.  Loquat is a member of the Eriobotrya genus in subfamily Maloideae along with apple, pear and hawthorn.  So far, loquat has not been reported as the host of any Monilia species.  In June 2019, brown rot symptoms were observed on loquat fruits in an orchard in Wuhan, Hubei Province, China.  Thirty single spore isolates were obtained and identified as M. fructicola based on morphological characteristics and molecular analysis.  This is the first report of loquat brown rot disease caused by Monilia species in the world.  Furthermore, upon artificial inoculation, all three Monilia species from peach in China, i.e., M. fructicola, M. mumecola and M. yunnanensis, could cause typical brown rot disease on loquat fruits.  At the same time, M. fructicola isolates from loquat showed virulence similar to those isolates from peach when the pathogenicity test was conducted on peach fruits.  These results suggested that loquat could be infected by other Monilia species and that isolates from loquat also have potential to damage other Rosaceae family fruits in practice. 
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