Orchis longicornu Poiret in Sardinia: genetic, morphological and chorological data

Corrias, Bruno; Rossi, Walter; Arduino, Paola; Cianchi, R.; Bullini, L.

doi:10.1080/00837792.1991.10670491

Cited by 46 publications

(30 citation statements)

References 35 publications

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“…Thus, because flies exhibit a behavior that enables self-pollination and orchids are typically self-compatible, we could expect that populations of myophilous orchids should have low genetic variability. However, several populations of the five Acianthera species studied by Borba et al (2001b) showed high levels of genetic variability, much higher than previously reported for other Orchidaceae (e.g., Scacchi & De Angelis, 1989;Schlegel et al, 1989;Scacchi et al, 1990;Corrias et al, 1991;Klier et al, 1991;Case, 1994) and near the maximum known for plant species (Hamrick & Godt, 1990). Borba et al (2001a) suggested that both self-incompatibility and inbreeding depression are responsible for the maintenance of high levels of genetic variability found in these species and that it may have arisen in these groups in response to pollinator behavior.…”

mentioning

confidence: 63%

Mating systems in the Pleurothallidinae (Orchidaceae): evolutionary and systematic implications

Borba¹,

Barbosa²,

Melo³

et al. 2011

Lankesteriana

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aBstract. We developed a project addressing the determination of the reproductive system through experimental pollinations of species in the major genera representing all major lineages of Pleurothallidinae in order to determine occurrence of self-incompatibility in the subtribe, in which group it has possibly appeared for the first time, and how many times it has evolved. Additionally we surveyed the floral biology of species of Octomeria, a genus with morphological characters typical of bee-pollinated flowers that was previously regarded as mellitophilous. At the moment, all but one of the species studied in selected large genera of the major lineages (Acianthera, Anathallis, Masdevallia, Octomeria, Specklinia, and Stelis) are self-incompatible. The species studied may possess complete, strong or partial self-incompatibility. We found two different sites where self-incompatibility reactions occur, the stigma and the stylar channel, and both sites were not found in the same genus except for Anathallis. In Anathallis, the two groups that differ morphologically (formerly Pleurothallis subgen. Specklinia sect. Muscosae and sect. Acuminatae) exhibit different sites of reaction. Flowers of Octomeria species produce nectar and are pollinated by both male and female Sciaridae flies, and the populations have high genetic variability similar to that found in Acianthera species. Our results indicate that self-incompatibility is a generalized widespread feature of the myophilous clade of the Pleurothallidinae and possibly evolved early in the subtribe, enabling the maintenance of high levels of genetic variability in the populations of each species in spite of pollinator behavior. Moreover, although sapromyophily (pollination by female flies by deceit) is much more common in the group, myophily s.s. (pollination by anthophilous flies seeking nectar) apparently evolved first from the plesiomorphic mellitophilous condition. In addition to the morphological synapomorphy uniting the members of the former circumscription of the subtribe (an articulation between the ovary and pedicel), our results also point to the occurrence of two biological synapomorphies in the group -self-incompatibility and myophily. Based on these differences, we suggest the splitting of Pleurothallidinae as presently recognized into two subtribes: one composed of the large, self-incompatible, myophilous clade and the other of the small, self-compatible, ornithophilous clade.rEsuMEn. Desarrollamos un proyecto dirigido a determinar, a través de polinización experimental, la autoincompatibilidad de los géneros representativos de los linajes más importantes de Pleurothallidinae, buscando el grupo donde posiblemente apareció por primera vez y cuántas veces ha ocurrido desde entonces. Adicionalmente estudiamos la biología floral de algunas especies de Octomeria, un género con características típicas de plantas con flores polinizadas por abejas, que previamente han sido conocidas como melitófilas. Hasta el momento, todas excepto una, de las especies estudiadas...

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mentioning

confidence: 63%

Mating systems in the Pleurothallidinae (Orchidaceae): evolutionary and systematic implications

Borba¹,

Barbosa²,

Melo³

et al. 2011

Lankesteriana

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“…Standard horizontal electrophoresis was done at 50 V/3 h and 80 V/4 h for buffer systems 1 and 2-3, respectively. The staining recipes were similar to but slightly modified from Brune et al (1998) for EST, PGI, and LAP; from Soltis et al (1983) for PGM, ME, SKDH; from Corrias et al (1991) for GOT, 6PGD, G6PDH; and from Alfenas et al (1991) to F-EST. The modifications were mainly in the amounts of the components used; the exact recipes can be obtained from the authors on request.…”

Section: Methodsmentioning

confidence: 99%

Low Allozymic Variation in the Bidens pilosa L. Complex (Asteraceae)

2005

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Bidens alba, B. subalternans, and B. pilosa form a complex group based on their morphological similarities. Bidens pilosa L. and B. subalternans DC. are herbs with a wide distribution in agricultural and disturbed areas. Bidens alba (L.) DC. varies in size from herb to subshrub and has a coastal distribution. Enzyme electrophoresis was used to evaluate genetic diversity in 12 populations of Bidens. All but three loci (Lap-1, Est, and Got) were monomorphic. Est-1 and Got were polymorphic only in B. alba. Lap-1 was polymorphic only in B. pilosa and B. subalternans. The estimates of genetic variability were low for all three taxa and all of the populations studied. Genetic diversity varied from 0.01 to 0.03. Mean genetic identities were high among populations of each species (0.99 for B. alba and 1.00 for B. pilosa and B. subalternans) and among the three species (1.00). Bidens pilosa and B. subalternans could be considered a single species if the taxonomy of the group were based solely on isozyme data.

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“…Four buffer systems were used to analyze 17 enzymatic systems ( Table 2). The gels were stained according to Shaw and Prasad (1970), Ward and Warwick (1980) and Corrias et al (1991).…”

Section: Allozyme Electrophoresismentioning

confidence: 99%

Population genetics of Collisella subrugosa (Patellogastropoda: Acmaeidae): evidence of two scales of population structure

José

Solferini

2006

Genetica

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Marine invertebrate populations usually show high levels of genetic variability that has frequently been associated with spatial and temporal environmental heterogeneity. One of the most heterogeneous marine environments is the intertidal zone, the habitat of Collisella subrugosa, the most widespread and abundant Brazilian limpet. C. subrugosa has planktonic larvae that can disperse over long distances, what can promote gene flow among shores, working against interpopulational differentiation. In this study we investigated the genetic variability and populational substructure of C. subrugosa through analysis of 24 allozyme loci in 14 samples (590 individuals) collected along 2,700 km of the Brazilian coast. The genetic variability was high ([Formula: see text] and [Formula: see text]), as expected for intertidal species. Genetic differentiation among samples was low (F (ST) = 0.03) what may reflect intensive gene flow associated with larval dispersal. However, we detected an isolation-by-distance pattern of population substructure in one sampled region. High levels of heterozygote deficiency were also observed for many loci in each sample. Alternative hypothesis are discussed, and the "breeding groups" is suggested to explain these pattern, indicating the main cause as environmental heterogeneity.

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Orchis longicornu Poiret in Sardinia: genetic, morphological and chorological data

Cited by 46 publications

References 35 publications

Mating systems in the Pleurothallidinae (Orchidaceae): evolutionary and systematic implications

Mating systems in the Pleurothallidinae (Orchidaceae): evolutionary and systematic implications

Low Allozymic Variation in the Bidens pilosa L. Complex (Asteraceae)

Population genetics of Collisella subrugosa (Patellogastropoda: Acmaeidae): evidence of two scales of population structure

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