Topic
Cestrum
About: Cestrum is a research topic. Over the lifetime, 110 publications have been published within this topic receiving 1158 citations.
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01 Jan 2000
TL;DR: The breeding systems and P/O ratios of five species of Cestrum (Solanaceae) of a cloud forest in Venezuela were studied, finding that the five species are xenogamous due to self-incompatibility mechanisms, with high P/ O ratios associated to this reproductive system.
Abstract: The breeding systems and P/O ratios of five species of Cestrum (Solanaceae) of a cloud forest in Venezuela were studied. The five species are xenogamous due to self-incompatibility mechanisms, with high P/O ratios associated to this reproductive system. The differences in the P/O ratios could be responses to the pollinators efficiency.
1 citations
TL;DR: Expression patterns suggest that FUL, SHP and SPT might control homologous characteristics, while ALC and RPL likely contribute to homoplasious anatomical features in Cestrum and Brugmansia fruits.
Abstract: The mechanisms controlling evolutionary shifts between dry and fleshy fruits in angiosperms are poorly understood. In Solanaceae, Cestrum and Brugmansia represent cases of convergent evolution of fleshy and dry fruits, respectively. Here we study the anatomical and genetic bases of the independent origin of fleshy fruits in Cestrum and the reversion to dry dehiscent fruits in Brugmansia. We also characterize the expression of candidate fruit development genes, including ALCATRAZ/SPATULA, FRUITFULL, HECATE1/2/3, REPLUMLESS and SHATTERPROOF. We identify anatomical changes to establish developmental stages in the ovary-to-fruit transition in Cestrum nocturnum and Brugmansia suaveolens. We generate reference transcriptomes for both species, isolate homologs for all genes in the fruit genetic regulatory network (GRN) and perform gene expression analyses for ALC/SPT, FUL, HEC1/2/3, RPL and SHP throughout fruit development. Finally, we compare our results to expression patterns found in typical capsules of Nicotiana tabacum and berries of Solanum lycopersicum available in public repositories. We have identified homologous, homoplasious and unique anatomical features in C. nocturnum and B. suaveolens fruits, resulting in their final appearance. Expression patterns suggest that FUL, SHP and SPT might control homologous characteristics, while ALC and RPL likely contribute to homoplasious anatomical features. The fruit GRN changes considerably in these genera when compared to typical capsules and berries of Solanaceae, particularly in B. suaveolens, where expression of FUL2 and RPL1 is lacking.
1 citations
01 Jan 2015
TL;DR: Despite the constancy of the karyotype and numbers of r DNA loci, the mapping of 18-5.8-26S and 5S rDNA loci allowed to dif- ferentiate Cestreae genera and species groups within Ces- trum, highlighting the importance of these markers as cytotaxonomic character in this tribe.
Abstract: Tribe Cestreae is monophyletic with three genera: Cestrum, Sessea, and Vestia. Karyotypically, it is outstanding within Solanaceae by several features: (1) basic number x = 8, (2) large chromosome sizes, (3) complex heterochromatin patterns, (4) occurrence of B-chromosomes (Bs) in Cestrum with particular banding patterns and rDNA sites distribution, and (5) absence of Arabidopsis-type telomeres. Seventeen South American Cestreae species from the three genera were studied using fluorescence in situ hybridization (FISH) with ribosomal DNA regions (5S and 18-5.8-26S) as probes, with the aim of recognizing specific or group-specific chromosomal markers and analyzing karyotype diversity in a systematic and evolutionary context. The first chromosome number report for Cestrum euanthes, C. kunthii, C. lorentzianum, and C. tomentosum is included. Variation in number and distribution of rDNA loci was observed among the species, concerning both As and Bs chromosomes. Despite the constancy of the karyotype and numbers of rDNA loci, the mapping of 18-5.8-26S and 5S rDNA loci allowed to dif- ferentiate Cestreae genera and species groups within Ces- trum, highlighting the importance of these markers as cytotaxonomic character in this tribe.
1 citations
01 Jul 2012
TL;DR: The presence in Haiti (Hispaniola Island) of the butterflies Greta diaphanus quisqueya (Fox, 1963) and Papilio demoleus Linnaeus, 1758 (Papilionidae) is documented for the first time.
Abstract: The presence in Haiti (Hispaniola Island) of the butterflies Greta diaphanus quisqueya (Fox, 1963) (Nymphalidae, Danainae) and Papilio demoleus Linnaeus, 1758 (Papilionidae) is documented for the first time. New localities for both species in the Dominican Republic are also included. Cestrum sphaerocarpum O. E. Schulz y Cestrum inclusum Urb. (Solanaceae) are reported as new host plants for the larvae of G. d. quisqueya.
1 citations