The effects of polyploidy on life span of Didymium iridis

Clark, Jim; Mulleavy, Perry

doi:10.1016/0147-5975(82)90066-4

Cited by 10 publications

(2 citation statements)

References 17 publications

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“…While these studies tend to support an infectious mitochondrial degeneration as an immediate cause of senescence, other studies with slime moulds give strong support to a nuclear control of lifespan (Clark & Hakim, 1980a, b;Clark & Mulleavy, 1982;Lott & Clark, 1980;McCullough et af., 1973). In both P. polycephafum (McCullough et af., 1973) and D .…”

Section: Discussionmentioning

confidence: 97%

“…In both P. polycephafum (McCullough et af., 1973) and D . iridis (Clark & Mulleavy, 1982) senescent plasmodia are characterized by a progressive increase in the number of large polyploid nuclei. These results need not be in conflict since nuclear genes could still be involved in the control and modulation of a mitochondrial degeneration system.…”

Section: Discussionmentioning

confidence: 99%

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Recurrent Senescence in Axenic Cultures of Physarum polycephalum

Hu¹,

Clark²,

Lott³

1985

Microbiology

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When subcultures of the aux-2 and aux-4 strains of Physarum polycephalum, which had been grown for more than four years in axenic shake culture, were transferred to non-axenic surface culture they displayed progressively shorter lifespans (older axenic surface cultures yield shorter lived non-axenic cultures). Similar subcultures transferred to axenic agar medium also underwent senescent-like events. These subcultures, after a period of vigorous growth, displayed a slower growth rate, reduced cytoplasmic streaming, loss of yellow pigment, and eventually they fragmented into a number of small spherical structures with the concomitant lysis of most of the plasmodium. In non-axenic culture these structures quickly degenerated (and disappeared from the culture); however, in axenic culture they revived and after several days produced new vigorous plasmodia. Following a period of vigorous growth the plasmodium again underwent senescent-like events. This cycle of senescence and growth was repeated a number of times before death finally occurred.

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Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%