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231224s2013 xx |||||o 00| ||eng c |
| 024 |
7 |
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|a 10.1093/jxb/ert062
|2 doi
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|a pubmed24n0753.xml
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|a (NLM)23519728
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|a DE-627
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|e rakwb
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| 041 |
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|a eng
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| 100 |
1 |
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|a Hoang, Hai Ha
|e verfasserin
|4 aut
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| 245 |
1 |
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|a Induction of secondary dormancy by hypoxia in barley grains and its hormonal regulation
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| 264 |
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|c 2013
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| 336 |
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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| 338 |
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|a ƒa Online-Ressource
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|2 rdacarrier
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|a Date Completed 30.05.2014
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|a Date Revised 21.10.2021
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a In barley, primary dormant grains did not germinate at 30 °C in air and at 15 °C in an atmosphere containing less than 10% O2, while they germinated easily at 15 °C in air. O2 tension in embryos measured with microsensors was 15.8% at 15 °C but only 0.3% at 30 °C. Incubation of grains at 30 °C is known to induce secondary dormancy in barley, and it was shown here that secondary dormancy was also induced by a 3 d treatment in O2 tensions lower than 10% at 15 °C. After such treatments, the grains lost their ability to germinate subsequently at 15 °C in air. During seed treatment in 5% O2, embryo abscisic acid (ABA) content decreased more slowly than in air and was not altered after transfer into air. Hypoxia did not alter the expression of ABA metabolism genes after 1 d, and induction of HvNCED2 occurred only after 3 d in hypoxia. Embryo sensitivity to ABA was similar in both primary and hypoxia-induced secondary dormant grains. Gibberellic acid (GA) metabolism genes were highly regulated and regulated earlier by the hypoxia treatment, with major changes in HvGA2ox3, HvGA3ox2 and HvGA20ox1 expression after 1 d, resulting in reduced GA signalling. Although a high temperature has an indirect effect on O2 availability, the data showed that it did not affect expression of prolyl-4-hydroxylases and that induction of secondary dormancy by hypoxia at 15 °C or by high temperature in air involved separate signalling pathways. Induction by hypoxia at 15 °C appears to be more regulated by GA and less by ABA than the induction by high temperature
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|a Journal Article
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| 650 |
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|a Gibberellins
|2 NLM
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| 650 |
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|a Plant Proteins
|2 NLM
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| 650 |
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|a Abscisic Acid
|2 NLM
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| 650 |
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7 |
|a 72S9A8J5GW
|2 NLM
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| 700 |
1 |
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|a Bailly, Christophe
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Corbineau, Françoise
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Leymarie, Juliette
|e verfasserin
|4 aut
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| 773 |
0 |
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|i Enthalten in
|t Journal of experimental botany
|d 1985
|g 64(2013), 7 vom: 10. Apr., Seite 2017-25
|w (DE-627)NLM098182706
|x 1460-2431
|7 nnns
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| 773 |
1 |
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|g volume:64
|g year:2013
|g number:7
|g day:10
|g month:04
|g pages:2017-25
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| 856 |
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|u http://dx.doi.org/10.1093/jxb/ert062
|3 Volltext
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