Cellular Features of the Fronds and Turions in Spirodela polyrhiza

摘要: Spirodela polyrhiza, a giant duckweed, of the family Lemnaceae is small, free-floating aquatic species and well-known for peculiar mode vegetative reproduction. Fronds are leaflike structures derived from fused stems leaves (Landolt, 1986, 1998; Lemon & Posluszny, 2000), with multiple root system on each frond (Kim, 2007). A mother produces daughter fronds two meristematic regions several times during growth, but turions also formed within toward end growing season as dormant overwintering structures. The and/or turion primordia develop those tissues repetition primordial growth leads to characteristic reproduction in this species. S. polyrhiza has drawn attention among species, since generations originated by fronds. With light or electron microscopy, nature pigmentation (Formin et al., 1992), morphological patterns 1998), anatomy (Appenroth Bergfeld, 1993; Kim Kim, 2000; Kwak 2008), abscission were studied Structural features another genus same family, Lemna (Melaragno Walsh, 1976; Walsh Melaragno, Echlin 1982; Echlin, have some attention, rather their was extensively. Formin al. (1992) revealed grana chloroplasts while surveying greening process etiolated duckweed. Landolt (1998) Posluszny (2000) reported detailed structural information at low magnification describing relationships taxa Lemnaceae. Numerous studies been carried out using plants various fields, mainly Cellular Features Turions