Antonio Luciano Rayos

University of the Philippines Los Baños | UPLB · Institute of Biological Sciences

The monotypic hepatic genus Meinungeria, with only M. mouensis, is endemic to New Caledonia. Its familial placement is uncertain, but its reduced morphology makes it likely to be a member of the large and diverse family Lepidoziaceae. A phylogenomic analysis involving 400 nuclear exons and a taxon set including M. mouensis and 191 species of Lepido...

Lepidoziaceae are the third-largest family of liverworts, with about 860 species distributed on all continents. The evolutionary history of this family has not been satisfactorily resolved, with taxa such as Micropterygioideae yet to be included in phylogenetic analyses. We inferred a dated phylogeny of Lepidoziaceae using a data set consisting of...

Lepidoziaceae are the third-largest family of liverworts, with about 860 species distributed on all continents. The evolutionary history of this family has not been satisfactorily resolved, with taxa such as Micropterygioideae yet to be included in phylogenetic analyses. We inferred a dated phylogeny of Lepidoziaceae using a data set consisting of...

Lepidoziaceae are the third-largest family of liverworts, with about 860 species found on all continents. With many taxa occupying a diverse range of habitats, these plants perform a variety of ecological roles. The evolutionary history of this family has not been satisfactorily resolved, with taxa such as the subfamily Micropterygioideae yet to be...

Lepidoziaceae are the third-largest family of liverworts, with about 860 species distributed on all continents. The evolutionary history of this family has not been satisfactorily resolved, with taxa such as Micropterygioideae yet to be included in phylogenetic analyses. We inferred a dated phylogeny of Lepidoziaceae using a data set consisting of...

Lepidoziaceae are a large family of liverworts with over 700 species in about 30 genera and seven subfamilies. To date, the phylogeny of the family has not yet been resolved, with three subfamilies–Lepidozioideae, Lembidioideae, and Zoopsidoideae–previously shown not to be monophyletic by previous studies. We performed a phylogenetic analysis of a...

With over 100 species indigenous to the Philippines, Hoya R. Br. is the most species-rich genus of Family Apocynaceae in the archipelago. Most species of this genus are epiphytic, and some species are hemiepiphytic or terrestrial. Epiphytic species must have adaptive features that help them survive water shortages caused by not having their roots a...

The bioherbicidal activity of kapa-kapa (Medinilla magnifica Lindl.) was studied for the first time. Phenolics from its leaves were extracted with 7:7:6 methanol-acetone-water (MAW). The phenolics of the crude extract were quantified using the Folin-Ciocalteu method and values of 71.86 mg GA∙g-1 extract for total phenolics and 29.58 mg QUE∙g-1 extr...

The bioherbicidal activity of kapa-kapa (Medinilla magnifica Lindl.) was studied for the first time. Phenolics from its leaves were extracted with 7:7:6 methanol-acetone-water (MAW). The phenolics of the crude extract were quantified using the Folin-Ciocalteu method and values of 71.86 mg GA•g-1 extract for total phenolics and 29.58 mg QUE•g-1 extr...

Heavy usage of synthetic herbicides has raised a major issue on the emergence of herbicide-resistant weeds. One strategy to address this concern is to develop natural product-based herbicides. In this study, phytotoxic activity of acid-hydrolyzed extract of A. candolleana against E. crus galli was investigated to determine its potential bioherbicid...

Two flavonoids were found to be commonly occurring across 18 previously studied species of Medinilla Gaudich. These compounds have taxonomic significance in Medinilla because they are widely occurring in the genus but not present in all species. This study aimed to isolate and identify the aglycone components of these two flavonoids. It was reveale...

Dissochaeta and Medinilla are both genera of Tribe Dissochaeteae of Family Melastomataceae. Based on previous molecular studies, Dissochaeta is more primitive than Medinilla, so the former is a good choice of outgroup for the latter. This study aimed to compare the phenolic profile of Dissochaeta acmura Stapf & M.L. Green with the phenolic profiles...

Transverse sections of leaf blade of seven species of Melastomataceae, representing four genera, namely, Astronia, Dissochaeta, Medinilla, and Melastoma were analyzed. Similarities and differences among the species were observed in terms of the presence of adaxial hypodermis as well as the number of cell layers in palisade and spongy mesophyll. Exc...

Strongylodon juangonzalezii Hadsall, Alejado, and Cajano, is the eighth species of Strongylodon in the country. This endemic species is distinguishable from the others in exhibiting plagiotropic dense inflorescence. When young, the flowers are lilac, and then gradually turn blue upon maturation. In this study, the pigments of the young (lilac) and...

Phenolic compounds from the leaves of Kapa-Kapa or Medinilla magnifica Lindl. were extracted using 7:7:6 methanol-acetone-water. The crude extract gave total phenolics and total flavonoids values of 71.86 mg GAE/ g extract and 29.58 mg QUE/ g extract, respectively, following the Folin-Ciocalteu method. The crude extract was subjected to acid hydrol...

Phenolic compounds in the leaves of Medinilla magnifica Lindl., a species endemic to the Philippine archipelago, were extracted and analyzed by means of two-dimensional paper chromatography. Two major flavonoids were seen in the paper chromatogram visualized under UV lamp, and their absorption spectra in the UV region were read. These flavonoids we...

Among epiphytes like most species of wax plants (Hoya spp.), survival means minimizing water loss as well as retaining or trapping water. The cross sections of the vegetative organs—root, stem, and leaf—of Hoya heuschkeliana Klopp., were prepared using the standard paraffin method to investigate the anatomical features of this species. The followin...

Leaf anatomy of two non-epiphytic species of Philippine Medinilla Gaudich., namely, M. annulata C.B. Rob. and M. inaequifolia C.B. Rob., was studied by light microscopy. Both species exhibit the following features in their lamina: single-layered upper and lower epidermis, hypodermis between upper epidermis and palisade mesophyll, sclerified palisad...

Two-dimensional paper chromatography was employed in phenolic profiling of four species of Philippine Medinilla Gaudich., namely, M. annulata, M. inaequifolia, M. merrittii, and M. miniata. Across the four species, different types of phenolic compounds were detected in the paper chromatograms by UV visualization. In all four species, a flavonoid th...

The genus Hoya, commonly known as wax plant belongs to Family Apocynaceae (kalachuchi family). Co’s Digital Flora of the Philippines lists 121 species, most of which are endemic to the archipelago. Hoyas are herbaceous epiphytes that contain milky sap, a characteristic feature of the family.. This paper investigates the leaf anatomy of four (4) ind...

The genus Medinilla Gaudich., having about eighty Philippine species, is widely distributed in the archipelago. This study used morphological and chemical data to explain taxonomic relationship among eighteen species belonging to the genus. For chemical data, two-dimensional paper chromatography was employed to survey different phenolic compounds p...

Leaf anatomy of four epiphytic species of Philippine Medinilla, namely, M. magnifica Lindl., M. miniata Merr., M. pendula Merr., and M. teysmannii Miq., was characterized by observation of leaf cross sections prepared through paraffin method. Similarities among the four species revealed by this study include thick hypodermis below the upper epiderm...

Survey on the anatomy of the thick leaves of five species of Philippine Medinilla Gaud., namely, M. magnifica, M. miniata, M. cumingii, M. pendula, and M. teysmannii (all of which being epiphytic shrubs in their natural habitat), revealed similarities in the leaf cross sections (prepared by paraffin method) as observed under light microscope. Thick...