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Content Provider | World Health Organization (WHO)-Global Index Medicus |
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Author | Maia, Julio Dekkers, Bas J. W. Dolle, Miranda J. Ligterink, Wilco Hilhorst, Henk W. M. |
Description | Country affiliation: Netherlands Author Affiliation: Maia J ( Wageningen Seed Lab, Laboratory of Plant Physiology, Wageningen University, Wageningen, 6708 PB, the Netherlands.) |
Abstract | During germination, orthodox seeds lose their desiccation tolerance (DT) and become sensitive to extreme drying. Yet, DT can be rescued, in a well-defined developmental window, by the application of a mild osmotic stress before dehydration. A role for abscisic acid (ABA) has been implicated in this stress response and in DT re-establishment. However, the path from the sensing of an osmotic cue and its signaling to DT re-establishment is still largely unknown. Analyses of DT, ABA sensitivity, ABA content and gene expression were performed in desiccation-sensitive (DS) and desiccation-tolerant Arabidopsis thaliana seeds. Furthermore, loss and re-establishment of DT in germinated Arabidopsis seeds was studied in ABA-deficient and ABA-insensitive mutants. We demonstrate that the developmental window in which DT can be re-established correlates strongly with the window in which ABA sensitivity is still present. Using ABA biosynthesis and signaling mutants, we show that this hormone plays a key role in DT re-establishment. Surprisingly, re-establishment of DT depends on the modulation of ABA sensitivity rather than enhanced ABA content. In addition, the evaluation of several ABA-insensitive mutants, which can still produce normal desiccation-tolerant seeds, but are impaired in the re-establishment of DT, shows that the acquisition of DT during seed development is genetically different from its re-establishment during germination. |
File Format | HTM / HTML |
ISSN | 0028646X |
Issue Number | 1 |
Volume Number | 203 |
e-ISSN | 14698137 |
Journal | New Phytologist |
Language | English |
Publisher | Wiley |
Publisher Date | 2014-07-01 |
Publisher Place | Great Britain (UK) |
Access Restriction | Subscribed |
Subject Keyword | Discipline Botany Abscisic Acid Physiology Desiccation Seeds Stress, Physiological Arabidopsis Genetics Gene Expression Regulation, Plant Germination Osmotic Pressure Journal Article Research Support, Non-u.s. Gov't |
Content Type | Text |
Resource Type | Article |
Subject Domain (in MeSH) | Plant Structures Eukaryota Organic Chemicals Investigative Techniques Physical Phenomena Genetic Phenomena Physiological Phenomena |
Subject | Plant Science Physiology |
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