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Overexpression of StCYS1 gene enhances tolerance to salt stress in the transgenic potato (Solanum tuberosum L.) plant
LIU Min-min, LI Ya-lun, LI Guang-cun, DONG Tian-tian, LIU Shi-yang, LIU Pei, WANG Qing-guo
2020, 19 (9): 2239-2246.   DOI: 10.1016/S2095-3119(20)63262-2
Abstract139)      PDF in ScienceDirect      
Salt stress seriously restricts the growth and yield of potatoes.  Plant cystatins are vital players in biotic stress and development, however, their roles in salt stress resistance remain elusive.  Here, we report that StCYS1 positively regulates salt tolerance in potato plants.  An in vitro biochemical test demonstrated that StCYS1 is a bona fide cystatin.  Overexpression of StCYS1 in both Escherichia coli and potato plants significantly increased their resistance to high salinity.  Further analysis revealed that the transgenic plants accumulated more proline and chlorophyll under salt stress conditions.  Moreover, the transgenic plants displayed higher H2O2 scavenging capability and cell membrane integrity compared with wild-type potato.  These results demonstrate that StCYS1 is closely correlated with salt stress and its overaccumulation can substantially enhance salt stress resistance.
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Bacterial artificial chromosome library construction of root-knot nematode resistant pepper genotype HDA149 and identification of clones linked to Me3 resistant locus
GUO Xiao, YANG Xiao-hui, YANG Yu, MAO Zhen-chuan, LIU Feng, MA Wei-qing, XIE Bing-yan, LI Guang-cun
2017, 16 (01): 57-64.   DOI: 10.1016/S2095-3119(16)61446-6
Abstract1202)           
Pepper (Capsicum annuum. L.) is a widely cultivated vegetable crop worldwide and has the second largest planting area and the first largest vegetable output and value in China.  Pepper root-knot nematode (Meloidogyne spp.) is one of the most serious pests of pepper, which caused huge losses every year.  Previous studies showed that the Me3 gene is resistant to a wide range of Meloidogyne species, including M. arenaria, M. javanica, and M. incognita.  HDA149, a double haploid pepper genotype, harboring the root-knot nematode resistance gene Me3, was used to construct bacterial artificial chromosome library (BAC) via the vector of CopyControlTM pCC1 in this study.  The library consists of 210 200 BAC clones and is equivalent to 5.3 pepper genomes.  The average insert size is 95 kb, and most of them are 90–120 kb; but the empty clones are less than 3%.  In order to screen the BAC library easily, 550 super pools with 384 BAC clones of each pool were further developed in this study.  Specific primers from Me3 gene locus were used for BAC library screening, and more than 20 positive BAC clones were obtained.  Then the selected positive BAC clones were analyzed by restriction enzyme digestion, BAC-end sequencing, marker development, and new positive BAC clones exploration, respectively.  Finally, the contig with total length of about 300 kb linked to the Me3 locus was constructed based on chromosome walking strategy, which made a solid foundation for the cloning of the important root-knot nematode resistance gene Me3.
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