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Germinação e re-indução de tolerância à dessecação em sementes germinadas de tabebuia impetiginosa e alliaria petiolata
| Content Provider | Semantic Scholar |
|---|---|
| Author | Veira, Carlos |
| Copyright Year | 2008 |
| Abstract | Vieira, Carlos Vinicio. Germination and re-induction of desiccation tolerance in germinated seeds of Tabebuia impetiginosa and Alliaria petiolata. 2008. 98p. Thesis (Doctor in Plant Physiology) – Federal University of Lavras, Lavras, MG. The objective of this study was to investigate the physiology of the germination of Tabebuia impetiginosa seeds, the seedling’s desiccation tolerance and their re-induction to desiccation tolerance after submitted to polyethylene glycol stress (PEG-8000) and high and low temperatures followed by controlled drying. Alliaria petiolata seedlings were used as protocol test for drying tolerance. The first stage of the studies was to investigate the germination in the best temperature conditions for T. impetiginosa, which was placed at 30 oC in light presence (8/16), starting after 24 hours of imbibition, reaching 100% of protrusion in 49 hours. Under dark conditions at 30oC, the germination started after 38 hours of imbibition, reaching 100% in 67 hours. Identifying the germination factors, even using elevated concentration of gibberellins inhibitors, paclobutrazol and tetcyclasis (both to 100μM) the germination was not completely inhibited, reaching 32% of protrusion in presence of paclobutrazol and 48% in presence of tetcyclasis. The presence of inhibitors delayed germination onset. When fluridon was added to inhibit ABA accumulation during soaking in the presence of light (8/16h), the germination began after 22 hours of soaking, overcoming all previous times. The second stage of the study was to evaluate desiccation tolerance. Initially, selected germinated seeds (seedlings) in relation to radicle length, submitted to controlled drying, were also separated in parts (radicle, hypocotyls and cotyledons) for further dehydration. For that, seedlings and dissected parts (radicle, hypocotyls and cotyledons) from Tabebuia impetiginosa and Alliaria |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://repositorio.ufla.br/bitstream/1/1881/1/TESE_Germina%C3%A7%C3%A3o%20e%20re-indu%C3%A7%C3%A3o%20de%20toler%C3%A2ncia%20%C3%A0%20desseca%C3%A7%C3%A3o%20em%20sementes%20germinadas%20de%20tabebuia%20impetiginosa%20e%20alliaria%20petiolata.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
