The distribution of genetic variability in Baccharis concinna (Asteraceae), an endemic, dioecious and threatened shrub of rupestrian fields of Brazil

Gomes, V. S. M.; Collevatti, Rosane G.; Silveira, Fernando A. O.; Fernandes, G. Wilson

doi:10.1023/b:coge.0000030000.27772.36

Cited by 15 publications

(11 citation statements)

References 40 publications

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“…Data for sandy and stony grasslands are modified from Negreiros et al (2014) and Le Stradic et al (2015a) Therefore, the main process favouring heterozygosity in campo rupestre species should be effective crosspollination by highly mobile vectors such as birds and large bees. Dioecy may also be an important trait maintaining genetic diversity among populations (Gomes et al 2004). …”

Section: Mutualistic Plant-animal Interactionsmentioning

confidence: 99%

Ecology and evolution of plant diversity in the endangered campo rupestre: a neglected conservation priority

et al. 2015

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Section: Mutualistic Plant-animal Interactionsmentioning

confidence: 99%

Ecology and evolution of plant diversity in the endangered campo rupestre: a neglected conservation priority

et al. 2015

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“…and Schult., which grows in large and widespread populations. On the other hand, Gomes et al (2004) reported a high level of genetic diversity in Baccharis concinna Barroso, an endemic and also, rare species in Serra do Cipó. However, no comparison was made within the genus, which indicates the necessity of analyzing a more common congener for comparison.…”

Section: Discussionmentioning

confidence: 98%

Genetic variation in twoChamaecristaspecies (Leguminosae), one endangered and narrowly distributed and another widespread in the Serra do Espinhaço, Brazil

2007

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The Serra do Espinhaço in Brazil is under continuous and increasing levels of human disturbance. It has a large number of endemic plant species such as Chamaecrista semaphora (Irwin and Barneby), an endangered species with extremely narrow range. We studied the genetic diversity of C. semaphora and compared it with Chamaecrista mucronata (Spreng.) Irwin and Barneby, a widespread congeneric species distributed over the entire Serra do Espinhaço, in an attempt to provide information for conservation strategies. Two populations of C. mucronata and the only two known populations of C. semaphora from Serra do Cipó were screened for variability using random amplified polymorphic DNA (RAPD) markers. Populations of C. semaphora exhibited a lower percentage of polymorphic markers (16.9%) and Shannon’s Diversity Index (H′pop = 0.124) than C. mucronata populations (43.3% and H′pop = 0.299). Most of the genetic variability of both species studied was distributed within populations; C. semaphora populations (ΦST = 0.198) were less divergent than C. mucronata populations (ΦST = 0.378). The risk of extinction for C. semaphora is large owing to its low level of genetic diversity compared with its widespread congener and because of increasing habitat destruction. Both populations of C. semaphora urgently need protection to maximize the genetic diversity of this species and diminish further substantial loss within the populations.

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“…in general, high genetic diversity values within populations are expected in xenogamous species (Nybom & Bartish, 2000), while in autogamous species such as Coffea arabica (Rubiaceae) values of total diversity are relatively high and genetic diversity within populations low (Aga, Bekele, & Bryngelsson, 2005). High genetic diversity was reported for endemic species (Kang, Chang, & Kim, 2000;Gomes, Collevatti, Silveira, & Fernandes, 2004) whose genetic variability is maintained by their own particular reproductive mechanisms or strategies. Therefore, the greater genetic divergence within P. hastisepala populations may be explained by its self-incompatibility and vegetative reproduction, due to the maintenance of genetic variability by the clones in the latter case.…”

Section: Discussionmentioning

confidence: 99%

Éxito reproductivo y diversidad genética de Psychotria hastisepala (Rubiaceae), en un bosque fragmentado de una selva atlántica de Brasil.

Silva

Vieira

Carvalho-Okano

et al. 2013

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Abstract:The impacts of forest fragmentation on both reproductive biology and genetic diversity of native plant species is hardly understood, despite some studies have analyzed this current worldwide problem. Since this constitutes one of the main threats to seasonal semi-deciduous forests in Southeastern Brazil, we investigated the reproductive success and the genetic diversity of a distylous, understory shrub (Psychotria hastisepala) within this context of forest fragmentation. For this study, a set of seven forest fragments of sizes ranging from 4.1 to 168.7 hectares were chosen. The intervenient matrix comprised pastures (25-50%), monocultures (33-50%) and rural roads and buildings (14-28.5%). Overall, 91 plants (54 for the short-styled morph and 37 for the long-styled morph; mean of 6.5 plants per fragment) were investigated. To evaluate reproductive success, we quantified fruit and seed production under natural pollination; to evaluate genetic diversity and population structure, we employed iSSR markers on genomic DNA. Plants with the short-styled morph exhibited a significantly higher reproductive success than those with the long-styled morph; there was no association between seed production and size of the forest fragment. Levels of genetic diversity were positively associated with the number of plants per fragment; but they were not related to flower morph. AMOVA showed that about 65% of the overall genetic variation was attributed to the differences between plants within fragments. The results suggested that populations of P. hastisepala were susceptible to decline owing to forest fragmentation. Rev. Biol. Trop. 62 (1): 309-319. Epub 2014 March 01.

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The distribution of genetic variability in Baccharis concinna (Asteraceae), an endemic, dioecious and threatened shrub of rupestrian fields of Brazil

Cited by 15 publications

References 40 publications

Ecology and evolution of plant diversity in the endangered campo rupestre: a neglected conservation priority

Ecology and evolution of plant diversity in the endangered campo rupestre: a neglected conservation priority

Genetic variation in twoChamaecristaspecies (Leguminosae), one endangered and narrowly distributed and another widespread in the Serra do Espinhaço, Brazil

Éxito reproductivo y diversidad genética de Psychotria hastisepala (Rubiaceae), en un bosque fragmentado de una selva atlántica de Brasil.

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