Trioecy in Coccoloba cereifera Schwacke (Polygonaceae), a narrow endemic and threatened tropical species

Silva, Celice Alexandre; Oliva, Marco Antônio; Vieira, Milene Faria; Fernandes, Geraldo Wilson

doi:10.1590/s1516-89132008000500017

Cited by 21 publications

(22 citation statements)

References 31 publications

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“…Coccoloba cereifera (Polygonaceae) is a narrowly distributed endemic shrub of 0.5-3.0 m high species found only in an area of 26 km 2 of the rupestrian fields of Serra do Cipó (Ribeiro and Fernandes 2000;Ribeiro et al 2003;Silva et al 2008). Coccoloba cereifera is a conspicuous species commonly associated with sandy patches between rocky outcrops with poor soils (Ribeiro and Fernandes 2000).…”

Section: Plant Species and Study Sitementioning

confidence: 99%

Relationships between endophyte diversity and leaf optical properties

Sánchez‐Azofeifa

Oki

Fernandes

et al. 2011

Trees

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A single tropical plant species can harbour hundreds of endophyte species within its tissues. Beyond this, little is known about the relationship between endophyte colonization, leaf traits and spectral properties of leaves. We explore these relationships in Coccoloba cereifera, a plant well known for its symbiotic properties. Endophyte richness in C. cereifera was statistically correlated with leaf traits such as water content, the ratio of fresh weight/dry weight and polyphenol/leaf specific weight. Endophyte diversity was also related to spectral vegetation indices of chlorophyll content. The associations among endophyte diversity, leaf traits and spectral reflectance pose new questions and present new opportunities to better understand plant-fungal symbioses and related leaf optical properties.

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Section: Plant Species and Study Sitementioning

confidence: 99%

Relationships between endophyte diversity and leaf optical properties

Sánchez‐Azofeifa

Oki

Fernandes

et al. 2011

Trees

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“…The leaves of C. cereifera are bluish-purple and are covered with a thick layer of wax that protects them from complete burning during the frequent fires of the region. The species has been shown to reproduce via facultative apomixis and has a complex sexual reproductive system in which each individual produces one of four flower types: staminate, pistillate and two different hermaphroditic forms (Silva et al 2008). Additionally, C. cereifera may grow vegetatively by the production of stolons resulting in a preponderance of patches of genetically identical individuals (ramets).…”

Section: Introductionmentioning

confidence: 99%

Spatial genetic structure of Coccoloba cereifera (Polygonaceae), a critically endangered microendemic species of Brazilian rupestrian fields

et al. 2009

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Coccoloba cereifera (Polygonaceae) is an extremely rare endemic shrub found exclusively in the rupestrian fields of Serra do Cipó, southeastern, Brazil. We assessed the genetic diversity and structure across the single occurrence area of C. cereifera. The genetic variation at 13 microsatellite loci was estimated from 139 individuals sampled in nine patches. The number of alleles per locus varied from two to ten; the expected and observed heterozygosity ranged from 0.324 to 0.566 and 0.337 to 0.529, respectively. Microsatellites detected low but statistically significant levels of differentiation among patches (F ST = 0.123, R ST = 0.105), whereas Mantel test results showed a weak but significant pattern of isolation by distance (r 2 = 0.31, P \ 0.002). Bayesian clustering indicated two subdivisions connected via admixture. Habitat heterogeneity across the drainage basin of the Rio Indequicé is likely limiting gene flow within patches of the geographically restricted population. While there is currently no evidence for a direct genetic risk to species survival, the apparent natural segregation occurring within the species could be exacerbated by future land use changes and the influx of alien species which could lead to demographic reductions in population size leading to a reduction in genetic diversity and an increase in population subdivision. We suggest that maintaining the integrity of the habitat within the small range of the species and continued monitoring of the effects of alien species would be the wisest use of management resources.

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“…In other cases of trioecy, cosexuals use to show only one or a few sexual kinds: monoecious trees in Taxus canadensis (Allison 1991), hermaphrodite trees in Conoloba cerifera (Silva et al 2008) and Pachycereus pringlei (Fleming et al 1998), hermaphrodite and andromonoecious plants in Wurmbea dioica (Barrett 1998). Trioecy in G. indica is therefore peculiar by its diversity of forms of cosexuality.…”

Section: Discussionmentioning

confidence: 99%

Sexual system of Garcinia indica Choisy: geographic variation in trioecy and sexual dimorphism in floral traits

Sebastian

Murthy

2014

Plant Syst Evol

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Most flowering plants are hermaphroditic with both stamens and carpels in the same flower. Other sexual systems are derived from ancestral hermaphroditism through one of the following pathways namely via monoecy, directly from hermaprhoditism, via gynodioecy, via distyly or via androdioecy. Sexual system in the genus Garcinia is highly diverse and includes dioecious, gynodioecious, androdioecious, polygamodioecious, monoecious and andromonoecious species. Garcinia indica Choisy (kokum tree) is reported to be polygamodioecious or gynodioecious. In the present study, sexual variation was estimated in seven populations of Garcinia indica of Western Ghats to determine the extent of variation among the populations and 14 floral traits were studied to assess the sexual dimorphism in floral traits. Four basic kinds of flowers namely, male flowers, male flowers with pistillode, female flowers with staminodes and bisexual flowers, were found in G. indica. These basic kinds of flowers occurred individually on a particular tree, producing unisexual individuals, or in combination of two, forming cosexual individuals. Thus, this species is trioecious, although the percentage of cosexual trees varied in different geographical locations. All the populations included cosexuals except one whereas pure hermaphroditic trees were present only in one. Significant differences were observed in 11 out of the 14 floral traits studied in the seven populations resulting in the diversity of sex forms. Male flowers had larger petal and female flowers were in general smaller than the other kinds. Interestingly, bisexual flowers were not always intermediate in size between male and female flowers.

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Trioecy in Coccoloba cereifera Schwacke (Polygonaceae), a narrow endemic and threatened tropical species

Abstract: Trioecy, the co-occurrence of the males, females, and hermaphrodite morphs in natural populations

Cited by 21 publications

References 31 publications

Relationships between endophyte diversity and leaf optical properties

Relationships between endophyte diversity and leaf optical properties

Spatial genetic structure of Coccoloba cereifera (Polygonaceae), a critically endangered microendemic species of Brazilian rupestrian fields

Sexual system of Garcinia indica Choisy: geographic variation in trioecy and sexual dimorphism in floral traits

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