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RELATIONSHIPS AMONG GROWTH RATE, CELLULAR MANGANESE CONCENTRATIONS AND MANGANESE TRANSPORT KINETICS IN ESTUARINE AND OCEANIC SPECIES OF THE DIATOM THALASSIODIRA 1
Author(s) -
Sunda William G.,
Huntsman Susan A.
Publication year - 1986
Publication title -
journal of phycology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.85
H-Index - 127
eISSN - 1529-8817
pISSN - 0022-3646
DOI - 10.1111/j.1529-8817.1986.tb00022.x
Subject(s) - manganese , thalassiosira pseudonana , biology , kinetics , ion , environmental chemistry , diatom , botany , chemistry , ecology , nutrient , physics , phytoplankton , organic chemistry , quantum mechanics
Growth rate, cellular manganese concentration and mangfanese uptake kinetics were measured as functions of the free manganese ion concentration in the medium for two centric diatoms. Thalassiodira oceanica Hasle, isolated from a lou'‐managanese oceanic enviorment. was capable of better growth at low manganese ion concentrations that T. pseudonana hasle and Heimdal, islated from higt.manganese estuatine waters. This was dur to the oceanic species’ greater avility to accumulate manganese at low free ion concentrations and to grow well at lower cellular manganese concentions. Manganese up take in both species followed classical saturation kinestics, and V max but not K, Uaried with the managanese ion concentration in the growth medium. The K s of managanese uptake for T. Oceanica (10 ‐795 M) was one‐seventh of that for T. Pseudonana. accouning for T. oceanica's greater ablility to accumulate managaese at low gree ion concentrations.V max appeared to be under negative feedback control in both species and six‐ to twelve‐fold variations in this parameter allowed cells to regulate cellular managanese at nearly constant valies at manganese ion concentrations in the vicinity of and somewhat below K r The range in free manganese ion concenteations over which regukation occurred was diffrent for the two species, and coincided with the in free manganese ion concentrations of the natural habitat of each species.