Responsiveness of Amaranthus retroflexus seeds to ethephon, 1-aminocyclopropane 1-carboxylic acid and gibberellic acid in relation to temperature and dormancy |
| |
Authors: | J Kepczynski F Corbineau D Côme |
| |
Institution: | (1) Dept of Plant Physiology, University of Szczecin, Felczaka 3a, 71-412 Szczecin, Poland;(2) Physiologie Végétale Appliquée, Université Pierre et Marie Curie, Tour 53, ler étage, 4 place Jussieu, 75252 Paris cédex 05, France |
| |
Abstract: | Dormant Amaranthus retroflexus seeds do not germinate in the dark at temperatures below 35°C. Fully dormant seeds germinate only at 35–40°C whereas non-dormant ones germinate within a wider range of temperatures (15 to 40°C). Germination of non-dormant seeds requires at least 10% oxygen, but the sensitivity of seeds to oxygen deprivation increases with increasing depth of dormancy. 10–6 to 10–4
M ethephon, 10–3
M 1-aminocyclopropane 1-carboxylic acid (ACC) and 10–3
M gibberellic acid (GA3) break this dormancy. In the presence of 10–3
M GA3 dormant seeds are able to germinate in the same range of temperatures as non-dormant seeds. The stimulatory effect of GA3 is less dependent on temperature than that of ethephon, while ACC stimulates germination only at relatively high temperatures (25–30°C). The results obtained are discussed in relation to the possible involvement of endogenous ethylene in the regulation of germination of A. retroflexus seeds.Abbreviations ACC
1-aminocyclopropane 1-carboxylic acid
- GA3
gibberellic acid
- SD
standard deviation |
| |
Keywords: | ACC Amaranthus retroflexus dormancy ethephon ethylene germination gibberellic acid temperature |
本文献已被 SpringerLink 等数据库收录! |
|