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Arabidopsis thaliana microRNA162 level is posttranscriptionally regulated via splicing and polyadenylation site selection

100%
Barciszewska-Pacak M., Knop K., Jarmołowski A., Szweykowska-Kulińska Z.
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2016
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vol. 63
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issue 4
811-816
EN
Arabidopsis microRNA162 (miRNA162) level regulation was studied under abiotic stresses, such as drought and salinity. The TaqMan® microRNA assay proved that A. thaliana miRNA162 level was elevated under these stresses, confirming its salt and drought responsiveness. The promoter region analyses of A. thaliana miRNA162a and b genes (MIR162a and MIR162b) identified numerous salinity and drought responsive elements. However, our results indicated that Arabidopsis MIR162a was presumably the main locus responsible for the mature ath-miRNA162 accumulation under the stresses tested, and the MIR162b was generally rather weakly expressed, both in control and under the stress conditions. The MIR162a structure was confirmed to be complex and the pri-miRNA162a hairpin structure was shown to span an alternative exon and an intron. The MIR162a transcription generated a few pri-miRNA162a splicing isoforms that could be functional and non-functional. Upon drought and salinity stresses, the regulation of the pri-miRNA162a alternative splicing pattern revealed an increase of a functional pri-miR162a isoform and a preferential distal polyA site selection under the stress conditions. Apart from the potential transcriptional regulation of the miRNA genes (MIRs) expression, the data obtained point to an essential role of posttranscriptional regulation of Arabidopsis microRNA162 level.
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QTL analysis of moderate drought response in a rye Recombinant Inbred Line (RIL) population shows co-localization of QTLs for morphological and physiological traits

88%
Myśków B., Czyczyło-Mysza I., Sokołowska S., Stojałowski S.
Acta Biologica Cracoviensia s. Botanica
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2018
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vol. 60
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issue 2
3
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PROTECTIVE-STIMULATING PROPERTIES OF CHITOSAN IN THE VEGETATION AND STORING TOMATOES

75%
Kiprushkina E. I., Shestopalova I. A., Pekhotina A. M., Kuprina E. E., Nikitina O. V.
Progress on Chemistry and Application of Chitin and its Derivatives
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2017
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vol. 22
77-81
EN
Data for using natural chitosan for plant-induced resistance to diseases and physiological stresses are presented. Provision on the possibility of combining resistance inducer properties not only to diseases, but also to physiological stresses, is postulated. It is shown that treatment of tomatoes and tomato seeds with chitosan leads to both increased resistance and increased reproductive abilities of tomato plants. The biogenic elicitor chitosan, based on a "Agrohit" ("АгроХит") preparation, induces the resistance of tomatoes to Phytophtora infestan and Alternaria solani. The plants grown from seeds processed by chitosan exhibit less damage from pathogens during the vegetation period. The action of the elicitor influenced a change in terpenoid biogenesis (formation of a phytoalexinari chitin). Beside protection functions, this preparation has stimulating activity and can be used to achieve higher yields of tomatoes, which are tolerant to stress conditions. The use of elicitors for plant-induced resistance provides ecological safety and an economically significant improvement of the parameters of plant produce and storage.
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