..., the mechanisms underlying organ size regulation remain unknown. Here, we investigated the role of RAN1, a member of the Ras-related nuclear GTPase family, in regulating pollen size. A RAN1 knockdown mutant (ran1-1) exhibited a significant reduction in pollen size, accompanied by impaired germination and reduced...

...Juan de Dios Alché; Antonio Jesús Castro; Adela Olmedilla; María del Carmen Fernández; Rosalía Rodríguez; Mayte Villalba; María Isabel Rodríguez-García ABSTRACT The distribution of Ole e I (the major olive pollen allergen) and its transcripts was investigated in the anther from premeiotic stages...

...Deborah D. Miller; Stylianos P. Scordilis; Peter K. Hepler ABSTRACT The presence and localization of actin and myosin have been examined in pollen tubes of Lilium longiflorum and Nicotiana alata . Immunoblot analysis of pollen tube extracts with antibodies to actin, myosins IA and IB, myosin II...

... microsporogenesis phragmoplast pollen The cytokinetic apparatus involved in quadripartitioning the microsporocyte into a tetrad of spores differs significantly from that of vegetative cell division (Brown and Lemmon, 1991a , 1992). In histogenesis, the cytokinetic apparatus consists of the preprophase...

...R. C. Brown; B. E. Lemmon ABSTRACT The unequal first pollen mitosis in moth orchids (Phalaenopsis) is followed by an unusual form of cytokinesis that isolates a small lens-shaped generative cell from a large vegetative cell. No preprophase band of microtubules predicts the division plane...

...R. C. Brown; B. E. Lemmon ABSTRACT Cytoplasmic preparation for the unequal first mitosis in non-vacuolate pollen of moth orchids (Pbalaenopsis) includes reorganization of the microtubular cytoskeleton and nuclear migration. Following meiotic cytokinesis, both microtubules and F-actin...

...M. I. Zuberi; H. G. Dickinson ABSTRACT A method is described by which the changes in shape that accompany hydration of Brassica pollen grains may be rapidly measured. Using this technique it has proved possible to chart the small amount of hydration that takes place on anthesis, in addition...