Agar Composition as a Function of Morphology and Growth Rate. Studies on Some Morphological Strains of Gracilaria secundata and Gracilaria verrucosa (Rhodophyta)

Crescimento in vitro de linhagens de coloração vermelha e verde clara de Gracilaria birdiae (Gracilariales, Rhodophyta) em dois meios de cultura: análise de diferentes estádios reprodutivos

“…A. gametófitos femininos; B. gametófitos masculinos; C. tetrasporófitos (F = gametófitos femininos; M = gametófitos masculinos). Fórmula utilizada para o cálculo das taxas de crescimento, TC = [(Mf / Mi) 1/t -1] x 100% (Lignell & Pedersén 1989); onde TC, taxa de crescimento; Mf, medida final; Mi, medida inicial; e t, tempo. que apresentaram TCc superiores em Von Stosch, quando comparadas às verificadas em Provasoli.…”

“…O crescimento foi avaliado durante um mês por medidas de massa fresca e comprimento. Estas medidas foram utilizadas para o cálculo das taxas de crescimento segundo a fórmula: TC = [(Mf / Mi) 1/t -1] x 100% (Lignell & Pedersén 1989); onde TC, taxa de crescimento; Mf, medida final; Mi, medida inicial; e t, tempo.…”

Selection in Modular Organisms: Is Intraclonal Variation in Macroalgae Evolutionarily Important?

“…Such analyses are particularly relevant to red macroalgae, since previous studies have documented a variety of sources of intraclonal variation in several Gracilaria species. Van der Meer et al (1984) noted the spontaneous production of a mutant bisexual branch by a male Gracilaria tikvahiae clone that remained bisexual in subsequent cultures, while Lignell and Pedersén (1989) found that wild-type Gracilaria secundata thalli were capable of differentiation into at least eight morphologically distinct strains. Santelices and Varela (1993) detected significant phenotypic variation in growth rate and morphology among Gracilaria chilensis branches of a single thallus and spores from the same cystocarp, and growth-related increases in genetic heterogeneity among branches of individual G. chilensis thalli have also been observed .…”

Life history, morphological variability and growth rates of the life phases of <i>Gracilaria tenuistipitata</i> (Rhodophyta: Gracilariales) <i>in vitro</i>

“…Branches were gently blotted dry and weighted weekly on an analytical balance MettlerToledo AE 200S. Growth rates (GR) were assessed weekly according to Lignell and Pedersén (1989). A two-way analysis of variance was performed using the software STATISTICA 7.0 (StatSoft, Inc.), considering the time and life-history stages as independent variables and the growth rates as dependent variables.…”