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CHEMICAL CONTROL OF ANDROSPORE MORPHOGENESIS IN OEDOGONIUM DONNELLII (CHLOROPHYTA, OEDOGONIALES) 1
Author(s) -
Hill Gerry J. C.,
Cunningham Muriel Ft.,
Byrne Margaret M.,
Ferry Thomas P.,
Halvorson Jason S.
Publication year - 1989
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.1529-8817.1989.tb00133.x
Subject(s) - thallus , biology , ammonium , botany , nitrate , morphogenesis , chlorophyta , algae , biochemistry , ecology , chemistry , organic chemistry , gene
Under the influence of the pheromone, “circein,” produced by an oogonial mother cell of Oedogonium donnellii Wolle , the androspore of the same species progresses through several behavioral changes and a series of developmental stages which result in the formation of a sperm‐producing dwarf male thallus. When subjected instead to an environment with an increased nitrate or ammonium ion concentration [0.02 M KNO 3 or 0.01 M (NH) 2 SO 4 ], an androspore undergoes a series of developmental changes which result in the formation of a vegetative male thallus indistinguishable from the one which originally released it. If exposed to neither circein nor increased nitrate/ammonium ion concentration, the androspore enters a cycle of swimming androspore: cyst: swimming androspore. Thus, three separate paths are open to the androspore depending on its environment: (1) development into a dwarf male thallus under the influence of female‐produced pheromone, circein, (2) development into a vegetative thallus under the influence of increased nitrate/ammonium ion concentration, and (3) periodic regeneration through an encystment cycle in an unaltered environment. Treatments with transcriptional and translational inhibitors indicate that androspore development into either a dwarf male or a vegetative thallus requires several different phases of de novo synthesis of RXA and protein stimulated by circein or by nitrate ion.