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Wang B.H.,Nantong University | Wang B.H.,State Key Laboratory of Cotton Biology | Zhu P.,Nantong University | Yuan Y.L.,State Key Laboratory of Cotton Biology | And 9 more authors.
Genetics and Molecular Research | Year: 2014

Salt stress is becoming one of the major problems in global agriculture with the onset of global warming, an increasing scarcity of fresh water, and improper land irrigation and fertilization practices, which leads to reduction of crop output and even causes crop death. To speed up the exploitation of saline land, it is a good choice to grow plants with a high level of salt tolerance and economic benefits. As the leading fiber crop grown commercially worldwide, cotton is placed in the moderately salt-tolerant group of plant species, and there is promising potential to improve salt tolerance in cultivated cotton. To facilitate the mapping of salt-tolerant quantitative trait loci in cotton so as to serve the aims of salt-tolerant molecular breeding in cotton, it is necessary to develop salt-tolerant molecular markers. The objective of this research was to develop simple sequence repeat (SSR) markers based on cotton salt-tolerant expressed sequence tags. To test the efficacy of these SSR markers, their polymorphism and cross-species transferability were evaluated, and their value was further investigated on the basis of genetic diversity and evolution analysis. © FUNPEC-RP.

He S.P.,State Key Laboratory of Cotton Biology | Sun J.L.,State Key Laboratory of Cotton Biology | Du X.M.,State Key Laboratory of Cotton Biology
Genetics and Molecular Research | Year: 2011

Introgression lines are some of the most important germplasm for breeding applications and other research conducted on cotton crops. The DNA methylation level among 10 introgression lines of cotton (Gossypium hirsutum) and three exotic parental species (G. arboreum, G. thurberi and G. barbadense) were assessed by methylation sensitive amplified polymorphism (MSAP) technology. The methylation level in the introgression lines ranged from 33.3 to 51.5%. However, the lines PD0111 and PD0113 had the lowest methylation level (34.6 and 33.3%, respectively) due to demethylation of most non-coding sequences. Amplified fragment length polymorphism (AFLP) was used to evaluate the genetic polymorphism in the cotton introgression lines. A high degree of polymorphism was observed in all introgression lines (mean 47.2%) based on AFLP and MSAP analyses. This confirmed the effects of genetic improvement on cotton introgression lines. The low methylation varieties, PD0111 and PD0113 (introgression lines), clustered outside of the introgression lines group based on MSAP data, which was incongruent with an AFLP-based dendrogram, this phenomenon could be caused by environmental changes or introgression of exotic DNA fragments. © FUNPEC-RP.

Wang B.,Nantong University | Fu R.,Nantong University | Zhang M.,Nantong University | Ding Z.,Xuzhou Institute of Agricultural science of Xu huai Region of Jiangsu | And 6 more authors.
Genes and Genomics | Year: 2015

A methylation-sensitive amplification polymorphism method based on capillary electrophoresis was used to analyze DNA methylation levels in three cotton accessions, two salt-tolerant accessions CCRI 35 and Zhong 07 and one salt-sensitive accession CCRI 12. Many categories of DNA methylation happened in the three cotton accessions under salt treatment, including hypermethylation, hypomethylation, and other patterns. Hypermethylation happened at a significantly higher rate than that of hypomethylation in salt-tolerant accessions CCRI 35 and Zhong 07. On the contrary, in salt-sensitive accession CCRI 12, hypomethylation happened at a significantly higher rate than that of hypermethylation. In general, the global DNA methylation level significantly increased under salt stress in both salt-tolerant accessions CCRI 35 and Zhong 07, whereas there was no significant difference in the salt-sensitive accessions CCRI 12. Our results suggested that salt-tolerant cotton might have a mechanism of increasing the methylation level when responding to salt stress; the increase of the global level of DNA methylation and also different methylation patterns might play important roles in tolerance to salt stress in cotton. Some interesting genes were found through cloning and analysis of differently methylated DNA sequences, which might contribute to salt tolerance in cotton. © 2015, The Genetics Society of Korea and Springer-Science and Media.

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