Jingjing Li

Hebei Normal University, Chentow, Hebei, China

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Publications (2)6.82 Total impact

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    ABSTRACT: Deciphering the mechanisms underlying plant responses to abiotic stress is key to improving plant stress resistance. Much is known about the regulation of gene expression in response to salt stress at the transcriptional level; however, little is known about this process at the posttranscriptional level. Recently, we demonstrated that SKIP is a spliceosome component that interacts with clock gene pre-mRNAs and is essential for regulating their alternative splicing and mRNA maturation. In this study, we found that skip-1 plants are hypersensitive to both salt and osmotic stresses. SKIP is required for the alternative splicing and mRNA maturation of several salt-tolerance genes, including NHX1, CBL1, P5CS1, RCI2A, and PAT10. A genome-wide analysis revealed that SKIP mediates the alternative splicing of many genes under salt stress conditions, and that most of the alternative splicing events in skip-1 involve intron retention, which generates a premature termination codon in the transcribed mRNA. SKIP also controls alternative splicing by modulating the recognition or cleavage of 5' and 3' splice donor and acceptor sites under salt stress conditions. Therefore, this study addresses the fundamental question of how the mRNA splicing machinery in plants contributes to salt stress responses at the posttranscriptional level, and provides a link between alternative splicing and salt tolerance. Copyright © 2015 The Author. Published by Elsevier Inc. All rights reserved.
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    ABSTRACT: The phytohormone auxin plays a critical role in plant growth and development, and its spatial distribution largely depends on the polar localization of the PIN-FORMED (PIN) auxin efflux carrier family members. In this study, we identify a putative auxin efflux carrier gene in rice, OsPIN3t, which acts in auxin polar transport but is also involved in the drought stress response in rice. We show that OsPIN3t-GFP fusion proteins are localized in plasma membranes, and this subcellular localization changes under 1-N-naphthylphthalamic acid (NPA) treatment. The tissue-specific expression patterns of OsPIN3t were also investigated using a β-glucuronidase (GUS) reporter, which showed that OsPIN3t was mainly expressed in vascular tissue. The GUS activity in OsPIN3tpro::GUS plants increased by NAA treatment and decreased by NPA treatment. Moreover, knockdown of OsPIN3t caused crown root abnormalities in the seedling stage that could be phenocopied by treatment of wild-type plants with NPA, which indicated that OsPIN3t is involved in the control of polar auxin transport. Overexpression of OsPIN3t led to improved drought tolerance, and GUS activity significantly increased when OsPIN3tpro::GUS plants were subjected to 20% polyethylene glycol stress. Taken together, these results suggest that OsPIN3t is involved in auxin transport and the drought stress response, which suggests that a polar auxin transport pathway is involved in the regulation of the response to water stress in plants.
    The Plant Journal 08/2012; DOI:10.1111/j.1365-313X.2012.05121.x · 6.82 Impact Factor