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| Martins,Alexandre Cristante; Marchioretto,Rafaella Migliavacca; Vieira,Ariane Tonetto; Stiehl-Alves,Eudes Maria; Santos,Eliane Kaltchuk dos; Souza-Chies,Tatiana Teixeira de. |
| ABSTRACT South Brazilian grasslands are among the most species-rich grasslands worldwide yet they have been suffering ongoing degradation due to land-use. Little is known about the reproductive ecology of the native species of these grasslands. Thus, our goal was to characterize seed traits and germination requirements of three native species of the tribe Tigridieae (Iridaceae, Iridoideae) due to its richness in the Pampa biome and the contrasting morphology, cytogenetics, and geographic distributions of its representatives. We tested if closely related species possess similar seed traits and whether species with wider distributions have broader germination requirements. Seed production and mass were estimated, and morphological analyses, germination... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dormancy; Functional traits; Germination; Grasslands; Iridaceae; Photoinhibition; Regeneration niche; Reproductive ecology; Seed morphology; Time-to-event analysis. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062020000400730 |
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| Scatena,Vera Lucia; Segecin,Simone; Coan,Alessandra Ike. |
| This work studied the morphology and post-seminal development of seeds of Tillandsia gardneri Lindl., T. streptocarpa Baker, and T. stricta Sol. ex Sims (Bromeliaceae) from the "Campos Gerais", State of Paraná, Southern Brazil. The seeds (ca. 2.0 mm long) presented plumose appendages at their micropylar end, an important structure in the taxonomy of the family since it represented an elaborate apparatus allowing effective wind-dispersal. Seeds germinated after circa twenty days. The haustorial cotyledon, responsible for the seedling nutrition, appeared first during the germination process. No cataphyll or primary roots developed. A small tank came along in the seedling, formed by the base of the sheath of the first leaf, which overlapped that of the second... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Tillandsia; Seed morphology; Post-seminal development. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132006000700012 |
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| Hernández Salinas, Gregorio. |
| Se realizaron dos estudios con accesiones de Carica papaya L. provenientes de Baja California Sur, Veracruz y Campeche, México. En el primero, mediante descriptores morfológicos para papaya se cuantificó la diversidad morfológica en 20 accesiones de papayo en plantas femeninas (F) y hermafroditas (Hf), evaluando 25 características cuantitativas y 16 cualitativas. En base al análisis de componentes principales, las características cuantitativas de mayor contribución a la variabilidad total fueron: diámetro, longitud, diámetro de cavidad central, grosor de la pulpa, contenido de sólidos solubles totales, longitud del pedúnculo, color (valor a* y L*-CIELAB) del fruto, altura a la primera flor y número de nudos. Las características cualitativas de mayor... |
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Palavras-chave: Carica papaya L.; Brix; Calidad de fruto; Morfología de la semilla; Fruit quality; Seed morphology; Agroecosistemas Tropicales; Maestría. |
| Ano: 2013 |
URL: http://hdl.handle.net/10521/1997 |
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| Sarmento,Erivanessa Costa Sousa; Pereira,Kleane Targino Oliveira; Oliveira,Fernando Sarmento de; Leal,Caio César Pereira; Torres,Salvador Barros; Dutra,Alek Sandro. |
| ABSTRACT The objective was to evaluate the physical characteristics and physiological behavior of A. oleracea seeds during imbibition and germination, under different temperatures and photoperiods, as well as to determine the duration of the germination test. For this, biometric parameters (length, width and thickness) were measured in 100 seeds and thousand-seed weight was determined. In addition, the external structures of seeds and seedlings were described and the imbibition curve was monitored. Subsequently, the germination test was conducted at temperatures of 20, 25, 30, 35, 20-30 and 25-35 ºC, under constant and alternating light and dark photoperiods (12 h), arranged in 6 x 3 factorial scheme, with four replicates of 50 seeds. Seeds were sown in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Asteraceae; Jambu; Imbibition; Seed morphology; Seed analysis. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902019000400660 |
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