Morphological and molecular studies on the Brazilian native red seaweed Laurencia oliveirana (Rhodomelaceae, Ceramiales)

Abstract

Abstract:Morphological and molecular studies were carried out on Laurencia oliveirana from the type locality (Arraial do Cabo, Rio de Janeiro, Brazil). This species is easily recognized by its small size, sub-erect habit forming intricate cushion-like tufts and unilateral pectinate branching. The species displays all the typical characters of the genus Laurencia, such as the production of the fi rst pericentral cell underneath the basal cell of the trichoblast, tetrasporangia produced from particular pericentral cells, with the third and fourth pericentral cells becoming fertile, without production of additional pericentral cells, spermatangial branches produced from one of two laterals on the suprabasal cell of trichoblasts, and procarp-bearing segment with fi ve pericentral cells. Details of tetrasporangial plants and development of procarp and male plants are described for the fi rst time for the species. The phylogenetic position of L. oliveirana was inferred by analysis of the chloroplast-encoded rbcL gene sequences from 57 taxa. In all phylogenetic analyses, L. oliveirana grouped with L. caraibica, L. caduciramulosa, L. venusta and L. natalensis, forming a monophyletic clade within the Laurencia sensu stricto. The genetic divergence between L. oliveirana and the molecularly closest species, L. caraiba collected in Brazil, was 2.3%.

Physico-chemodiversity variation between the most common calcareous red seaweed, Eastern Harbor, Alexandria, Egypt

“…The thallus of Jania rubens is characterized rose-pink in colour, up to 1–1.5 cm, tufted, calcified, segments and branching repeatedly dichotomously branched and not opposite. Amphiroa rigida thallus is thickener (1000–1200 μ) than the both collected species (200–500 μ), the length up to 2 cm, erect, dichotomously branched and pinkish red in colour ( Cassano et al., 2012 ; Ismail and Osman, 2016 ).

Figure 1 Morphological and microscopic description of the collected algal species.

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“…Morphological characterization (length, thickness, color, branching) was carried in the same day of collection according to Cassano et al. (2012) .…”

Diversity and distribution of Laurencia sensu stricto (Rhodomelaceae, Rhodophyta) from the Mexican Pacific, including L. mutueae sp. nov.

“…Congruence areas were defined by clades of quadrants that present at least two synendemic species; also, it used groups with only one restricted species, with the objective to recognize distributional patterns. , 2011, Sentíes et al 2001, 2011, Sentíes & Fujii 2002, Fujii & Villaça 2003, Fujii & Sentíes 2005, Cassano et al 2006, 2012a, 2012b, 2012c…”

“…Cordeiro‐Marino & Fujii , Cordeiro‐Marino et al , Fujii & Cordeiro‐Marino , Fujii et al , , , Sentíes et al , , , Sentíes & Fujii , Fujii & Villaça , Fujii & Sentíes , Cassano et al , , , , Rocha‐Jorge et al , Collado‐Vides et al , , Mateo‐Cid et al , Hernández et al , Cassano et al …”

Ritmos circadianos em Gracilaria birdiae (Rhodophyta): oscilação do desempenho fotossintético e caracterização enzimática da nitrato redutase

“…Entretanto, no Brasil, tem-se tido um aumento significativo neste tipo de estudo, passando pela classificação de espécies por barcoding, caracterização de genes específicos e seus mecanismos regulatórios e estudos de transcriptoma em cultivo e meio natural expostas a diversos poluentes (CASSANO et al, 2012;COSTA et al, 2012;DE OLIVEIRA et al, 2012;FALCÃO;NYVALL COLLÉN et al, 2011). …”