|
|
|
|
|
| Cisternas,Mauricio A; Araneda,Loreto; García,Nicolás; Baeza,Carlos M. |
| Chromosome numbers and karyotypes of seven specific taxa of the Chilean endemic genus Placea were determined. Chromosome numbers of P. lutea, P. ornata, P grandiflora, P germainii andP. aff davidii are described for the first time. All taxa are diploid with 2«=2x=16 and karyotypes are composed of four metacentric (4 m), ten submetacentric (10 sm), and two subtelocentric (2 st) chromosomes. The most symmetrical karyotype was observed in P. lutea (AI: 6.84) while the most asymmetrical karyotype was shown by P. arzae (AI: 9.72). The constancy in karyotype formulae and high similarity in asymmetry indexes suggest that some orthoselection mechanism might be involved in Placea's chromosomal evolution. In spite that no significant karyotypic differences were... |
| Tipo: Journal article |
Palavras-chave: Chile; Endemic flora; Hippeastreae; Karyology. |
| Ano: 2010 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432010000200005 |
| |
|
|
| Steinfort,Ursula; Cisternas,Mauricio A; García,Rolando; Vogel,Hermine; Verdugo,Gabriela. |
| Chloraea crispa Lindl. is a terrestrial orchid endemic to Chile that has potential to be a novel alternative for the cut flower industry. The objectives of this study were to describe the phenological cycle and floral bud development of C. crispa to determine the timing of initiation and differentiation of the spike. During the summer, plants are dormant. The renewal buds are located at the top of the rhizome, next to the buds from which the shoot of the previous season originated. From the end of summer until the end of winter, the plant is in vegetative growth. From June onward, the flower stalk starts to emerge, and flowering and leaf senescence occur during the spring until the beginning of summer. The renewal buds started forming leaf primordia during... |
| Tipo: Journal article |
Palavras-chave: Chilean orchid; Orchidaceae; Geophyte; Orchid florogenesis; Orchid phenology; Terrestrial orchid. |
| Ano: 2012 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202012000200014 |
| |
|
|
| Valdivia,Carlos E; Cisternas,Mauricio A; Verdugo,Gabriela S. |
| The extent to which plants depend on pollinators for outcross pollen transportation is a key issue in plant reproductive ecology. We evaluated the putative breeding system, foral display, and natural pollination in two Southern Cone of South American orchids, Gavilea araucana and G. venosa, by performing four hand pollination trials (agamospermy, autogamy, geitonogamy, and xenogamy tests) and by counting each fower and fruit produced by plants in natural conditions. Fruit set differed signifcantly depending on the origin of pollen as well as on the presence of a pollen vector. None of these species produced fruits by the agamospermy tests, therefore indicating that they require the presence of pollen on the stigmas for fruit setting. By contrast, only G.... |
| Tipo: Journal article |
Palavras-chave: Autogamy; Allogamy; Self-compatibility; Foral display; Fruiting patterns. |
| Ano: 2010 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432010000100005 |
| |
|
|
|
