Wet-dry cycling extends seed persistence by re-instating antioxidant capacity

Long, RL, Kranner, I, Panetta, FD, Birtic, S, Adkins, SW and Steadman, KJ (2011) Wet-dry cycling extends seed persistence by re-instating antioxidant capacity. Plant and Soil, 338 1-2: 511-519. doi:10.1007/s11104-010-0564-2


Author Long, RL
Kranner, I
Panetta, FD
Birtic, S
Adkins, SW
Steadman, KJ
Title Wet-dry cycling extends seed persistence by re-instating antioxidant capacity
Journal name Plant and Soil   Check publisher's open access policy
ISSN 0032-079X
1573-5036
Publication date 2011-01
Year available 2010
Sub-type Article (original research)
DOI 10.1007/s11104-010-0564-2
Volume 338
Issue 1-2
Start page 511
End page 519
Total pages 9
Place of publication Dordrecht, Netherlands
Publisher Springer Netherlands
Collection year 2011
Language eng
Formatted abstract
Seeds in the field experience wet-dry cycling that is akin to the well-studied commercial process of seed priming in which seeds are hydrated and then re-dried to standardise their germination characteristics. To investigate whether the persistence (defined as in situ longevity) and antioxidant capacity of seeds are influenced by wet-dry cycling, seeds of the global agronomic weed Avena sterilis ssp. ludoviciana were subjected to (1) controlled ageing at 60% relative humidity and 53. 5°C for 31 days, (2) controlled ageing then priming, or (3) ageing in the field in three soils for 21 months. Changes in seed viability (total germination), mean germination time, seedling vigour (mean seedling length), and the concentrations of the glutathione (GSH) / glutathione disulphide (GSSG) redox couple were recorded over time. As controlled-aged seeds lost viability, GSH levels declined and the relative proportion of GSSG contributing to total glutathione increased, indicative of a failing antioxidant capacity. Subjecting seeds that were aged under controlled conditions to a wet-dry cycle (to -1 MPa) prevented viability loss and increased GSH levels. Field-aged seeds that underwent numerous wet-dry cycles due to natural rainfall maintained high viability and high GSH levels. Thus wet-dry cycles in the field may enhance seed longevity and persistence coincident with re-synthesis of protective compounds such as GSH. © 2010 Springer Science+Business Media B.V.
Keyword Ageing
Avena sterilis ssp ludoviciana
Glutathione
Priming
Wet-dry cycling
Wild oat
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Published online: 20 October 2010

 
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Created: Sun, 30 Jan 2011, 00:01:56 EST