ISSN:
1573-5117
Keywords:
Rhodophyta
;
Gracilaria verrucosa
;
evolution of ploidy
;
lead toxicity
;
ultra-violet mutagen
;
survival rates
;
growth
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract This study tests the responses of juvenile gametophytes and tetrasporophytes (holdfast stage) of the isomorphic alga Gracilaria verrucosa under different environmental conditions. Estimations of survival and growth of holdfasts of haploid and diploid juvenile individuals were performed in natural sea-water and artificial culture medium, and under stringent conditions using lead as a toxin and ultra violet radiation as a mutagen. Results indicate that (i) holdfasts of haploid juveniles grow better than diploids in non-optimal medium conditions; (ii) holdfasts of diploid juveniles have a better tolerance to lead than haploids; and (iii) slight advantage of holdfasts of diploid juveniles grow better than haploids under U.V. radiation.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00049011
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