Ultrastructure of meiosis in the mossRhynchostegium serrulatum I. Prophasic microtubules and spindle dynamics |
| |
Authors: | R. C. Brown B. E. Lemmon |
| |
Affiliation: | (1) Department of Biology, The University of Southwestern Louisiana, 70504 Lafayette, LA, USA |
| |
Abstract: | Summary An extensive system of microtubules develops during meiotic prophase in the mossRhynchostegium serrulatum (Hedw.)Jaeg. &Sauerb. Development of the cytoskeleton can be traced to early prophase when the nucleus is acentric and the single plastid divides into four plastids. The cytoskeletal microtubules are associated with equidistant positioning of the four plastids at the distal tetrad poles and with migration of the nucleus to a central position in the sporocyte. The cytoskeleton, which interconnects plastids and encloses the nucleus, contributes to the establishment of moss sporocyte polarity. Just prior to metaphase I evidence of the prophase cytoskeleton is lost as the bipolar metaphase I spindle develops in association with discrete polar organizers located in opposite cleavage furrows between plastids. |
| |
Keywords: | Meiosis Microtubules Polarity Ultrastructure Mosses |
本文献已被 SpringerLink 等数据库收录! |
|