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Seedling Establishment of Tall Fescue Exposed to Long-Term Starvation Stress
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SYSNO ASEP 0469794 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Seedling Establishment of Tall Fescue Exposed to Long-Term Starvation Stress Author(s) Pompeiano, Antonio (UEK-B) RID, ORCID, SAI
Damiani, C. R. (BR)
Stefanini, S. (IT)
Vernieri, S. (IT)
Reyes, T. H. (IT)
Volterrani, M. (IT)
Guglielminetti, L. (IT)Article number e0166131 Source Title PLoS ONE. - : Public Library of Science - ISSN 1932-6203
Roč. 11, č. 11 (2016)Number of pages 17 s. Language eng - English Country US - United States Keywords seedling ; Tall fescue ; Tall fescue exposed ; starvation Subject RIV EH - Ecology, Behaviour Institutional support RVO:67179843 - RVO:67179843 UT WOS 000387725000067 EID SCOPUS 84994418137 DOI 10.1371/journal.pone.0166131 Annotation In germinating seeds under unfavorable environmental conditions, the mobilization of stores in the cotyledons is delayed, which may result in a different modulation of carbohydrates balance and a decrease in seedling vigor. Tall fescue (Festuca arundinacea Schreb.) caryopses grown at 4 degrees C in the dark for an extended period in complete absence of nutrients, showed an unexpected ability to survive. Seedlings grown at 4 degrees C for 210 days were morphologically identical to seedlings grown at 23 degrees C for 21 days. After 400 days, seedlings grown at 4 degrees C were able to differentiate plastids to chloroplast in just few days once transferred to the light and 23 degrees C. Tall fescue exposed to prolonged period at 4 degrees C showed marked anatomical changes: cell wall thickening, undifferentiated plastids, more root hairs and less xylem lignification. Physiological modifications were also observed, in particular related to sugar content, GA and ABA levels and amylolytic enzymes pattern. The phytohormones profiles exhibited at 4 and 23 degrees C were comparable when normalized to the respective physiological states. Both the onset and the completion of germination were linked to GA and ABA levels, as well as to the ratio between these two hormones. All plants showed a sharp decline in carbohydrate content, with a consequent onset of gradual sugar starvation. This explained the slowed then full arrest in growth under both treatment regimes. The analysis of amylolytic activity showed that Ca2+ played a central role in the stabilization of several isoforms. Overall, convergence of starvation and hormone signals meet in crosstalk to regulate germination, growth and development in tall fescue. Workplace Global Change Research Institute Contact Nikola Šviková, svikova.n@czechglobe.cz, Tel.: 511 192 268 Year of Publishing 2017
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