Journal Article
- Construction of a genetic linkage map and QTL mapping of agronomic traits in Auricularia auricula-judae
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Li-Xin Lu , Fang-Jie Yao , Peng Wang , Ming Fang , You-Min Zhang , Wei-Tong Zhang , Xiang-Hui Kong , Jia Lu
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J. Microbiol. 2017;55(10):792-799. Published online September 28, 2017
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DOI: https://doi.org/10.1007/s12275-017-7241-6
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Abstract
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Auricularia auricula-judae is a traditional edible fungus that
is cultivated widely in China. In this study, a genetic linkage
map for A. auricula-judae was constructed using a mapping
population consisting of 138 monokaryons derived from a
hybrid strain (A119-5). The monokaryotic parent strains
A14-5 and A18-119 were derived from two cultivated varieties,
A14 (Qihei No. 1) and A18 (Qihei No. 2), respectively.
In total, 130 simple sequence repeat markers were mapped.
These markers were developed using the whole genome sequence
of A. auricula-judae and amplified in A14-5, A18-
119, and the mapping population. The map consisted of 11
linkage groups (LGs) spanning 854 cM, with an average interval
length of 6.57 cM. A testcross population was derived
from crossing between the monokaryon A184-57 (from the
wild strain A184 as a tester strain) and the mapping population.
Important agronomic trait-related QTLs, including
mycelium growth rate on potato dextrose agar for the mapping
population, mycelium growth rate on potato dextrose
agar and sawdust for the testcross population, growth period
(days from inoculation to fruiting body harvesting), and yield
for the testcross population, were identified using the composite
interval mapping method. Six mycelium growth raterelated
QTLs were identified on LG1 and LG4, two growth
period-related QTLs were identified on LG2, and three yieldrelated
QTLs were identified on LG2 and LG6. The results
showed no linkage relationship between mycelium growth
rate and growth period. The present study provides a foundation
for locating genes for important agronomic characteristics
in A. auricula-judae in the future.
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Citations
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Lee Seong Wei, Alvin Amos Adrian Susin, Albaris B. Tahiluddin, Liew Vui Kien, Wendy Wee
Heliyon.2024; 10(13): e33810. CrossRef - Evaluation of Drought Tolerance and Trehalose Response in Auricularia heimuer
Jian Sun, Fangjie Yao, Lixin Lu, Youmin Zhang, Ming Fang, Xiaoxu Ma, Kaisheng Shao, Xu Sun
Horticulturae.2024; 10(12): 1312. CrossRef -
Medicinal Value, Genetic Diversity, and Genetic Relationship Analysis of Auricularia cornea (Agaricomycetes) Based on ITS, ISSR, and SRAP Markers
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Scientific Reports.2019;[Epub] CrossRef
Research Support, Non-U.S. Gov't
- Biochemical Properties and Physiological Roles of NADP-Dependent Malic Enzyme in Escherichia coli
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Baojuan Wang , Peng Wang , Enxia Zheng , Xiangxian Chen , Hanjun Zhao , Ping Song , Ruirui Su , Xiaoning Li , Guoping Zhu
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J. Microbiol. 2011;49(5):797-802. Published online November 9, 2011
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DOI: https://doi.org/10.1007/s12275-011-0487-5
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Abstract
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Malic enzymes catalyze the reversible oxidative decarboxylation of L-malate using NAD(P)+ as a cofactor. NADP-dependent malic enzyme (MaeB) from Escherichia coli MG1655 was expressed and purified as a fusion protein. The molecular weight of MaeB was about 83 kDa, as determined by SDS-PAGE. The recombinant MaeB showed a maximum activity at pH 7.8 and 46°C. MaeB activity was dependent on the presence of Mn2+ but was strongly inhibited by Zn2+. In order to understand the physiological roles, recombinant E. coli strains (icdNADP/ΔmaeB and icdNAD/ΔmaeB) containing NADP-dependent isocitrate dehydrogenase (IDH), or engineered NAD-dependent IDH with the deletion of the maeB gene, were constructed using homologous recombination. During growth on acetate, icdNAD/ΔmaeB grew poorly, having a growth rate only 60% that of the wild-type strain (icdNADP). Furthermore, icdNADP/ΔmaeB exhibited a 2-fold greater adaptability to acetate than icdNAD/ΔmaeB, which may be explained by more NADPH production for biosynthesis in icdNADP/ΔmaeB due to its NADP-dependent IDH. These results indicated that MaeB was important for NADPH production for bacterial growth on acetate. We also observed that MaeB activity was significantly enhanced (7.83-fold) in icdNAD, which was about 3-fold higher than that in icdNADP, when switching from glucose to acetate. The marked increase of MaeB activity was probably induced by the shortage of NADPH in icdNAD. Evidently, MaeB contributed to the NADPH generation needed for bacterial growth on two carbon compounds.
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- Effects of Genetically Different 2.4-D-degradative Plasmids on Degradation Phenotype and Competitiveness of Soil Microorganisms
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Hong, Seok Myeong , Ahn, Young Joon , Park, Yong Keun , Min, Kyung Hee , Kim, Chi Kyung , Ka, Jong Ok
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J. Microbiol. 1995;33(3):208-214.
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Abstract
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The effects of various 2, 4-D-degradative plasmids on the axenic growth patterns, the degradation phenotypes, and the competitiveness of different host bacteria were evaluated in liquid cultures; the organisms and plasmids used were Alcaligenes eutrophus JMP134/pJP4, Alcaligenes paradoxus/p2811, Pseudomonas pickettii/p712, pJP4, and p712 or p 2811 exhibited very different restriction fragment profiles in restriction endonuclease digests. These plasmids were transferred to the recipients (P. cepacia and Alcaligenes JMP228) at relatively high frequencies ranging from 8.9 × 10^-3 to 1.6 × 10^-5 per donor cell. In the axenic liquid cultures the fast-growing strains, such as P. pseudomallei/p745 and P. cepacia/pJP4, exhibited short lag periods, high specific growth rates, and high relative fitness coefficients, while the slow-growing strains, such as P. pickettii/p712 and A. paradoxus/p2811, had long lag periods, low specific growth rates, and low relative fitness coefficients. Depending on the type of plasmid containing the genes for the 2, 4-D pathway, some transconjugants exhibited intermediate growth patterns between the fast-growing strains and the slow-growing strains. The plasmid and plasmid-host interactions determined specific growth rate and lag time, respectively, which were shown to be principal determinants of competitiveness among the strains, but relative fitness coefficient derived from the axenic culture was not always predictive for the mixed culture condition.