Dormancy cycling is accompanied by changes in ABA sensitivity in Polygonum aviculare seeds
| Autor: | Diego Batlla, Natalia Verónica Laspina, Roberto L. Benech-Arnold |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
0301 basic medicine Physiology Germination Endogeny Plant Science 01 natural sciences 03 medical and health sciences chemistry.chemical_compound Hormone metabolism Incubation Abscisic acid biology Seed dormancy food and beverages Polygonum aviculare Plant Dormancy biology.organism_classification Gibberellins Cell biology 030104 developmental biology chemistry Seeds Dormancy Gibberellin Polygonum Abscisic Acid 010606 plant biology & botany |
| Zdroj: | Journal of Experimental Botany. 71:5924-5934 |
| ISSN: | 1460-2431 0022-0957 |
| Popis: | Polygonum aviculare seeds show high levels of primary dormancy (PD). Low winter temperatures alleviate dormancy and high spring temperatures induce seeds into secondary dormancy (SD), naturally establishing stable seedbanks cycling through years. The objective of this work was to elucidate the mechanism(s) involved in PD expression and release, and in SD induction in these seeds, and the extent to which abscisic acid (ABA) and gibberellins (GAs) are part of these mechanisms. Quantification of endogenous ABA both prior to and during incubation, and sensitivity to ABA and GAs, were assessed in seeds with contrasting dormancy. Expression analysis was performed for candidate genes involved in hormone metabolism and signaling. It was found that endogenous ABA content does not explain either dormancy release or dormancy induction; moreover, it does not seem to play a role in dormancy maintenance. However, dormancy modifications were commonly accompanied by changes in ABA sensitivity. Concomitantly, induction into SD, but not PD, was characterized by a increased PaABI-5 and PaPYL transcription, and a rise in GA sensitivity as a possible counterbalance effect. These results suggest that dormancy cycling in this species is related to changes in embryo sensitivity to ABA; however, this sensitivity appears to be controlled by different molecular mechanisms in primary and secondary dormant seeds. |
| Databáze: | OpenAIRE |
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