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Jin W.,Northwest University, China | Jin W.,Key Laboratory for Molecular Biology of Agriculture | Wu F.,Northwest University, China | Xiao L.,Northwest University, China | And 5 more authors.
Journal of Plant Growth Regulation | Year: 2012

Botrytis cinerea Pers.:Fr. is an important pathogen in tomato plants that causes stem rot of tomatoes grown indoors for an extended period. MicroRNAs (miRNAs) have recently been reported as a class of gene expression regulators linked to stress responses; however, data on the role of miRNAs in plant responses to biotic stresses are still limited. In this study, three Botrytis stress-responsive miRNAs were identified using microarray analysis and the effects of Botrytis infection were surveyed in tomatoes. Two downregulated miRNAs and one upregulated miRNA were detected. These stress-responsive miRNAs regulated metabolic, morphological, and physiological adaptations of tomato seedlings at the post-transcriptional level. The presence of stress-related elements in the miRNA promoter regions further supports our results. These findings extend the current view about miRNAs as ubiquitous regulators under stress conditions. © 2011 Springer Science+Business Media, LLC.

Liu X.,Northwest University, China | Liu X.,Key Laboratory for Molecular Biology of Agriculture | Jin W.,Northwest University, China | Jin W.,Key Laboratory for Molecular Biology of Agriculture | And 4 more authors.
Russian Journal of Genetics | Year: 2011

High molecular weight (HMW) glutenin polypeptides are critical contributors to the visco/elastic properties responsible for the processing characteristics and utilizations of wheat flour. In order to improve bread making quality of flour and produce transgenic plants free of selectable markers, a linear DNA construct consisting of a minimal expression cassette with the HMW-GS 1Bx14 gene was transformed into wheat cultivar Mianyang19 by microprojectile bombardment. The transform ants were selected by PCR instead of herbicidal markers. Seven transgenic plants were identified from a total of 1219 transformants, yielding a transformation frequency of 0. 28%. An SDS-PAGE analysis confirmed that the 1Bx14 gene was expressed in three T1 seeds of the transgenic plants. Our results demonstrated that it is feasible to obtain marker-free trans-formants using the linear-expression-cassette-transformation approach coupled with PCR selection. © 2011 Pleiades Publishing, Ltd.

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