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This study analyzes the callus ontogeny of the Kappaphycus alvarezii brown strain tetrasporophyte using micropropagation and tissue culture. Calli were induced from axenic explants and grown for 2 months. Ontogenic analysis was made in explants collected from days 7 to 60 of culture and observed under light and transmission electron microscopy (TEM). At the(More)
Copper and lead, as remnants of industrial activities and urban effluents, have heavily contaminated many aquatic environments. Therefore, this study aimed to determine their effects on the physiological, biochemical, and cell organization responses of Hypnea musciformis under laboratory conditions during a 7-day experimental period. To accomplish this,(More)
By evaluating carotenoid content, photosynthetic pigments and changes in cellular morphology, growth rates, and photosynthetic performance, this study aimed to determine the effect of cadmium (Cd) on the development of young gametophytes of Gelidium floridanum. Plants were exposed to 7.5 and 15 μM of Cd for 7 days. Control plants showed increased formation(More)
This study investigates the pattern and performance of cellular structures during the early development of zygotes and embryos of Sargassum cymosum. The early development S. cymosum germlings has already been characterized and compared with the pattern of development established for all fucoid algae, in which the zygote remains attached to the receptacle by(More)
The increased incidence of UV-B radiation, particularly in southern South America, has sparked more interest in its effects on marine organisms. Here we describe the effects of UV-B on the early life stages of Gelidium floridanum, an agar-producing species abundant on rocky coasts in southern Brazil. Treated samples were submitted to 0.12 W m−2 of(More)
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