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- Title
Maturação e dormência em diásporos de carrapicho-de-carneiro (Acanthospermum hispidum DC. - Asteraceae).
- Authors
Duarte, Edson Ferreira; dos Santos, Jaylson Araújo; Souza Peixoto, Jailson de; Barbosa Santos, Carlos Henrique
- Abstract
The objective of the study was to evaluate the maturation of A. hispidum diaspores and methods for overcoming dormancy. Diaspores were obtained 7, 14, 21, 28 and 35 days after anthesis (DAA) from plants in the experimental area of the Universidade Federal do Recôncavo Bahiano, Cruz das Almas, Bahia, Brazil. Diaspore dimensions, water content and dry weight were evaluated. Emergence was tested at 25°C with 16 hours of light in washed sand. Emergence was monitored weekly, counting the aerial part of the seedlings above the substrate, and determining the germination velocity emergence (GVE) and percentage of dead and dormant diaspores. In another experiment, the treatments for overcoming dormancy were: scarification with sandpaper; washing in running water for 24 h; stratification at 10 °C for 7 days; GA3 4000 mg L-1; and intact seeds. The dry weight increased until 21 days and the length increased until 35 DAA. The maximum emergence (45%) and GVE (3.4) of the diaspores was at 21 DAA when there was physiological maturity. Dormancy increased in the subsequent stages. A. hispidum disperses physiologically dormant seeds and dormancy can be overcome with GA3.
- Subjects
DORMANCY in plants; ASTERACEAE; PLANT development; GERMINATION; SEED research; EXPERIMENTAL agriculture
- Publication
Revista Brasileira de Sementes, 2012, Vol 34, Issue 3, p441
- ISSN
0101-3122
- Publication type
Article
- DOI
10.1590/S0101-31222012000300011