| Underdeveloped embryos and germination in Aristolochia galeata seeds. | |
| | |
MedLine Citation:
|
PMID: 21134093 Owner: NLM Status: In-Process |
Abstract/OtherAbstract:
|
Aristolochiaceae have been described as having seeds with underdeveloped embryos and morphological or morphophysiological dormancy. Aristolochia galeata is a native climber found in the Cerrado biome, associated with road and gallery forest edges. The aims of this study were to investigate: embryo growth rate, morphology and seed germination parameters under different treatments. Embryos were excised to obtain embryo length at four stages: initial, seeds after coat rupture, radicle tip protrusion and cotyledon emergence from the seed coat. Germination tests were conducted at 30 °C under three nitrate concentrations (1, 10 and 20 mM), fluctuating temperature (27/20 °C) and light and dark conditions. We found that seeds have underdeveloped embryos, which take about 301 ± 178 h (±SD) to achieve seed coat rupture, another 205 ± 126 h to reach radicle protrusion and 176 ± 76 h more to the final stage of cotyledon emergence. Germinability was above 52% in all treatments, except in the dark (15%). For all treatments, average germination time was above 290 ± 123 h. Potassium nitrate increased germinability to >87%. No particular treatment was required for embryo development, but seeds in the population that continued to germinate after 1 month were probably in various states of non-deep, simple morphophysiological dormancy. Increased germinability in nitrate treatments and light requirement for germination could prevent germination under unsuitable environmental conditions and be a strategy to increase seedling establishment in the cerrado. |
| | |
Authors:
|
D Alves-Da-Silva; F Borghetti; K Thompson; H Pritchard; J P Grime |
Related Documents
:
|
22255523 - Mobile energy expenditure tracking system based on heart rate and motion providing extr... 19873053 - Critical illumination and flicker frequency, as a function of flash duration: for the s... 803833 - Phototactic responses along a gradient of light intensities for the sibling species dro... |
Publication Detail:
|
Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
|
Title: Plant biology (Stuttgart, Germany) Volume: 13 Suppl 1 ISSN: 1438-8677 ISO Abbreviation: Plant Biol (Stuttg) Publication Date: 2011 Jan |
Date Detail:
|
Created Date: 2010-12-07 Completed Date: - Revised Date: - |
Medline Journal Info:
|
Nlm Unique ID: 101148926 Medline TA: Plant Biol (Stuttg) Country: England |
Other Details:
|
Languages: eng Pagination: 104-8 Citation Subset: IM |
Copyright Information:
|
© 2010 German Botanical Society and The Royal Botanical Society of the Netherlands. |
Affiliation:
|
Departamento de Ecologia, Universidade de Brasília, Brasília (DF), Brazil. |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
|
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Fitness drivers in the threatened Dianthus guliae Janka (Caryophyllaceae): disentangling effects of ...
Next Document: Persistently low fruiting success in the Mediterranean pipevine Aristolochia baetica (Aristolochiace...