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- 저자 : Pamela J. Green (검색결과 3 건)
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The role of rice microRNAs in abiotic stress responses
정동훈,Pamela J. Green 한국식물학회 2013 Journal of Plant Biology Vol.56 No.4
microRNAs (miRNAs) are a class of small noncoding RNAs that regulate gene expression at the posttranscriptional level by mRNA cleavage or translation inhibition. They play diverse roles in plant growth and development as well as abiotic stress responses. In response to abiotic stresses such as drought, salt, cold, heat, and nutrient limitations, the expression levels of some miRNAs change, resulting in a modulation of the expression patterns of miRNA target genes that are associated with stress adaptations. In rice, stress-responsive miRNAs have been identified and characterized, and conserved regulation of conserved miRNAs as well as new regulation by conserved miRNAs and rice-specific miRNAs is evident. The regulatory mechanisms controlling target gene expression by stressresponsive miRNAs include both the coherent and incoherent regulatory networks that are dynamic and complex. A better understanding of the regulation of miRNAs and targets during stress responses can contribute to rice breeding for improving yield, quality and tolerance to abiotic stresses. Here, we review current advances in the area of rice miRNAs and target RNAs associated with abiotic stresses and discuss how they relate to miRNA-mediated stresstolerance.
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mRNA Degradation Machinery in Plants
Yukako Chiba,Pamela J. Green 한국식물학회 2009 Journal of Plant Biology Vol.52 No.2
Control of gene expression is exerted by multiple steps such as transcription, mRNA processing, mRNA export, mRNA degradation, translation, and posttranslational events. Recent discovery of small RNAs has enhanced the impact of posttranscriptional regulation, in particular, alterations in mRNA stability in the regulation of gene expression. Therefore, mRNA turnover is an important process not only for setting the basal level of gene expression but also as a regulatory step. Compared to the mechanism of transcription, much less information is available regarding mRNA degradation machineries. However, in the past several years, various components involved in the mRNA degradation process have been identified in eukaryotes. In particular, progress in the plant field has revealed the involvement of mRNA turnover in a wide variety of developmental processes and hormonal responses. Here, we provide an overview of machineries involved in general mRNA degradation and mRNA surveillance systems in plants.
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Kim, Yeonjoo,Kong, Inhye,Park, Hyesun,Kim, Heey Jin,Kim, Ik Jae,Um, Myoung-Jin,Green, Pamela A.,Vö,rö,smarty, Charles J. Elsevier 2018 Science of the Total Environment Vol.637 No.-
<P><B>Abstract</B></P> <P>Water resources have been threatened by climate change, increasing population, land cover changes in watersheds, urban expansion, and intensive use of freshwater resources. Thus, it is critical to understand the sustainability and security of water resources. This study aims to understand how we can adequately and efficiently quantify water use sustainability at both regional and global scales with an indicator-based approach. A case study of South Korea was examined with the framework widely used to quantify global human water threats. We estimated the human water threat with both global and local datasets, showing that the water security index using global data was adequately correlated with the index for regional data. However, particularly poor associations were found in the investment benefit factors. Furthermore, we examined several different aspects of the index with the local datasets as they have relatively high spatial and temporal resolution. For example, we used cropland percentage, population and moderate water use as surrogate indicators instead of employing the approximately 20 original indicators, and we presented a regression model that was able to capture the spatial variations from the original threat index to some extent. This finding implies that it would be possible to predict water security or sustainability using existing indicator datasets for future periods, although it would require regionally developed relationships between water security and such indicators.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Strong correlations were found between global and regional indicators except for investment benefits. </LI> <LI> Three key indicators represent the majority of the spatial variation in incident threat. </LI> <LI> R25° is the most appropriate spatial resolution for regional analysis. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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