EARLY DEVELOPMENT OF CARPOSPORES AND LIFE HISTORY OF DUMONTIA SIMPLEX COTTON
JIANG Peng;ZHAO Shu-Yu;LI Fang;WANG Hong-Wei;College of Life Sciences, Liaoning Normal University;
We investigated the effects of temperature, light intensity, and seawater salinity on early growth of spores of red alga Dumontia simplex Cotton in laboratory culture, as well as the development of spore type and life history of the alga. Results indicate that the development of spore type(carpospores and tetraspore) was ‘immediate discal type'. The growth of the spores was affected by temperature, light intensity, and seawater salinity. The suitable conditions for the growth of carpospores and tetraspore were determined at: temperature between 6—30°C, best at 9°C for carpospores and 9—12°C for tetraspore; light intensity between 80—400μmol/(m2·s), best at 160μmol/(m2·s) and 160—200μmol/(m2·s); and salinity between 15—50, best at 30 for both, respectively. The life history of D. simplex involved homotypic gametophyte(haploid), carposporophyte, and tetrasporophyte(diploid). Gametophyte and tetrasporophyte were morphologically identical and appeared alternately, being typical of homotypic alternation.