title: Metabolic patterns associated with the seasonal rhythm of seed survival after dehydration in germinated seeds of Schismus arabicus.
abstract: BACKGROUND
  Seed of Shismus arabicus, a desert annual, display a seasonal tolerance to dehydration. The occurrence of a metabolic seasonal rhythm and its relation with the fluctuations in seed dehydration tolerance was investigated.
  
  
  RESULTS
  Dry seeds metabolism was the least affected by the season, while the metabolism of germinated and dehydrated seeds exhibit distinct seasonal patterns. Negative associations exist between amino acids, sugars and TCA cycle intermediates and seed survival, while positive relations exist with seed germination. In contrast, associations between the level of secondary metabolites identified in the dehydrated seeds and survival percentage were evenly distributed in positive and negative values, suggesting a functional role of these metabolites in the establishment of seed dehydration tolerance.
  
  
  CONCLUSIONS
  Our results indicate the occurrence of metabolic biorhythms in germinating and dehydrating seeds associated with seasonal changes in germination and, more pronouncedly, in seed dehydration tolerance. Increased biosynthesis of protective compounds (polyphenols) in dehydrating seeds during the winter season at the expenses of central metabolites likely contributes to the respective enhanced dehydration tolerance monitored.
authors: Ben-Gurion University of the Negev, Jacob Blaustein Institutes for Desert Research, French Associates Institute for Agriculture and Biotechnology of Drylands, Midreshet Ben-Gurion, 84990, Israel. B.Bai@uu.nl.|Current address: Department of Molecular Plant Physiology, Utrecht University, Utrecht, 3584 CH, The Netherlands. B.Bai@uu.nl.
authors: Bing
authors: B
authors: Bai
authors: Ben-Gurion University of the Negev, Jacob Blaustein Institutes for Desert Research, French Associates Institute for Agriculture and Biotechnology of Drylands, Midreshet Ben-Gurion, 84990, Israel. toubiana@post.bgu.ac.il.
authors: David
authors: D
authors: Toubiana
authors: Ben-Gurion University of the Negev, Jacob Blaustein Institutes for Desert Research, French Associates Institute for Agriculture and Biotechnology of Drylands, Midreshet Ben-Gurion, 84990, Israel. gendler@bgu.ac.il.
authors: Tanya
authors: T
authors: Gendler
authors: Ben-Gurion University of the Negev, Jacob Blaustein Institutes for Desert Research, French Associates Institute for Agriculture and Biotechnology of Drylands, Midreshet Ben-Gurion, 84990, Israel. degua3@gmail.com.
authors: Asfaw
authors: A
authors: Degu
authors: Ben-Gurion University of the Negev, Jacob Blaustein Institutes for Desert Research, French Associates Institute for Agriculture and Biotechnology of Drylands, Midreshet Ben-Gurion, 84990, Israel. gutterma@bgu.ac.il.
authors: Yitzchak
authors: Y
authors: Gutterman
authors: Ben-Gurion University of the Negev, Jacob Blaustein Institutes for Desert Research, French Associates Institute for Agriculture and Biotechnology of Drylands, Midreshet Ben-Gurion, 84990, Israel. fait@bgu.ac.il.
authors: Aaron
authors: A
authors: Fait
mesh_terms: D003890:Desiccation; D018525:Germination; D007557:Israel; D006109:Poaceae / Q000254:growth & development / Q000378:metabolism / Q000502:physiology*; D012621:Seasons; D012639:Seeds / Q000502:physiology*
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