Germination of Oenothera curtiflora W. L. Wagner & Hoch (Onagraceae) related to fruit and seed structure
Oenothera curtiflora (Onagraceae) is a weed of cultivated fields and pastures which also grows in disturbed grounds. It was introduced to Argentina and is now common in Córdoba and San Luis provinces. The objectives of this study were to evaluate the germination of O. curtiflora, to describe its seedlings and to relate the germination process to fruit and seed morphological characteristics. Germination was assessed at 20-30°C. The treatments were: intact fruits soaked in water for 48 h, seeds removed from fruits soaked in water for 48 h and intact non-soaked fruits as the control. The indehiscent woody fruit chlamydocarpus was brown, while exalbuminous seeds were yellowish-red. The embryo showed a "hook-like" projection at the radicle that remained as a "unilateral outgrowth" during germination. Seeds removed from the fruits had a germination of 96% in 6 days, while germination of the control and the soaked fruits treatments were 82% and 83% respectively in 45 days. The seedling morphology of O. curtiflora places this species in the Macaranga and Chimonanthus seedling type.
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Document Type: Research Article
Publication date: July 1, 2009
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