Colloquia: Moss: from deep phylogeny and model organisms.
Stark, Lloyd R. .
Reproduction in Bryum argenteum.
Bryum argenteum represents a potentially good candidate for a model species because of (i) its widespread distribution, (ii) it typifies the dioecious condition with female dominance so prevalent in bryophytes, (iii) it reproduces both sexually (through sporophytes) and asexually (through specialized deciduous shootlets), (iv) it is amenable to laboratory culture and breeding studies, and (v) both generations exhibit degrees of desiccation and thermal tolerance so prevalent in bryophytes. Thus spores, shootlets, sporelings, shootlet germlings, protonemata, nonexpressing shoots, expressing shoots, and sporophytes from early embryonic to late meiotic capsule phenophases can be subject to experimental manipulation in order to answer a variety of biological questions. Here the question of unbalanced sex ratios is initially addressed using the effects of abiotic and biotic stress on both gametophytic and sporophytic phenophases of Bryum argenteum. Single spore isolates from a variety of capsules indicate that the unbalanced sex ratio is manifested later in the life cycle, and field based studies indicate that female plants are at an advantage under high thermal and desiccation stress conditions.
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1 - University of Nevada, Las Vegas, Department of Biological Sciences, 4505 Maryland Parkway, Las Vegas, Nevada, 89154-4004, USA
Presentation Type: Symposium or Colloquium Presentation
Location: Ballroom D/Convention Center
Date: Monday, August 2nd, 2010
Time: 10:15 AM