Developmental and Structural Section
Jolles, Diana D. , Wilson, C. .
Comparative leaf anatomy in three closely-related species of Pyrola (Ericaceae).
Subfamily Monotropoideae (Ericaceae) is comprised of two tribes of obligate mycoheterotrophic plants and one predominantly photosynthetic tribe that includes a single obligate mycoheterotroph, Pyrola aphylla. Pyrola picta and P. dentata, both sister species to P. aphylla, have scale-like leaves (along their rhizomes) and fully-expanded leaves (aerially), whereas P. aphylla typically produces only scale-like leaves. Relationships among these three sister species are historically controversial because all exhibit subtle floral variation and intermediate leaf forms, yet molecular evidence suggests that they may be distinct taxa. In this study, mature leaves of P. aphylla, P. picta, and P. dentata were sectioned to compare structural variation within and among taxa. Additionally, apical meristems were sectioned to compare patterns of cell division and enlargement at different stages of leaf development. I discuss leaf homologies, relative timing of leaf expansion, and the influence of environmental factors on intermediate leaf morphology in these three species of Pyrola.
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1 - Claremont Graduate University, Rancho Santa Ana Botanic Garden, 1500 N. College Avenue, Claremont, CA, 91711, USA
2 - Rancho Santa Ana Botanic Garden, 1500 N. College Ave, Claremont, California, 91711, USA
Presentation Type: Poster:Posters for Sections
Location: Hall A/Convention Center
Date: Monday, August 2nd, 2010
Time: 5:30 PM