We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Aspectos físicos e fisiológicos de sementes de Fimbristylis dicothoma relacionados à germinação e dormência.
- Authors
de Mendonça, Giovana Soares; Martins, Cibele Chalita; Martins, Dagoberto; Gomes Lopes, Maria Teresa
- Abstract
In the seeds of pioneer plants, the application of treatments for breaking dormancy, and selection by colour and size, are strategies for obtaining seeds of less dormancy and better germination performance. The aim of this study was to evaluate the effect of the physical and physiological aspects of seeds of the tall fringe-rush (Fimbristylis dichotomd) on germination and dormancy. To do this, the seeds were submitted to the following treatments in three studies: (i) control, immersion in H2S 0 4 (98%, 36N) for 1 minute, immersion in KN03 (1, 2 and 3%) for 15 minutes, seeding on a substrate moistened with KN03 (0.2%) and exposure for 5 and 10 hours in a forced air circulation oven at 40 and 70 °C; (ii) classification of the seeds by colour (light and dark) and application of the following treatments: control, immersion of the seeds in H2SO4 (98%, 36N) for 1 and 2 minutes, immersion in KN03 (5% and 10%) for 15 and 30 minutes and seeding on a substrate moistened with KN03 (0.2%); (iii) classification by size (0.60, 0.50 and 0.40 mm) and germination on a substrate moistened with KN03 (0.2%) or distilled H20 . The seeds were evaluated by germination test, first count and germination speed index. Moistening the substrate with KN03 (0.2%), and heat treatment at 40 °C for 10 hours improve performance in seeds of the tall fringe-rush. Light-coloured seeds do not display dormancy. Mediumsized seeds of the tall fringe-rush show better performance in terms of percentage and speed of germination.
- Publication
Revista Ciência Agronômica, 2015, Vol 46, Issue 3, p539
- ISSN
0045-6888
- Publication type
Article
- DOI
10.5935/1806-6690.20150036