Abstract
During meiosis in microsporogenesis, autonomous cellular organelles, i.e., plastids and mitochondria, move and separate into daughter cells according to a specific pattern. This process called chondriokinesis is characteristic for a given plant species. The key criterion for classification of the chondriokinesis types was the arrangement of cell organelles during two meiosis phases: metaphase I and telophase I. The autonomous organelles participate in cytoplasmic inheritance; therefore, their precise distribution to daughter cells determines formation of identical viable microspores. In this study, the course of chondriokinesis during the development of the male gametophyte in Tinantia erecta was analyzed. The study was conducted using optical and transmission electron microscopes. During microsporogenesis in T. erecta, autonomous cell organelles moved in a manner defined as a neutral-equatorial type of chondriokinesis. Therefore, metaphase I plastids and mitochondria were evenly dispersed around the metaphase plate and formed an equatorial plate between the daughter nuclei in early telophase I. Changes in the ultrastructure of plastids and mitochondria during pollen microsporogenesis were also observed.
Highlights
In flowering plants (Angiospermae), the male gametophyte is formed in the microsporangia of the anther in two consecutive stages of development: microsporogenesis and microgametogenesis
The vegetative cell contained a large nucleus with a nucleus as well as numerous cellular organelles located in the cytoplasm, i.e., plastids and mitochondria, endoplasmic reticulum, Golgi vesicles, and numerous free ribosomes
Given the location of cellular organelles in the two key stages of the meiotic division, i.e., metaphase I and telophase I, it can be concluded that T. erecta has a neutral-equatorial type of chondriokinesis
Summary
In flowering plants (Angiospermae), the male gametophyte is formed in the microsporangia of the anther in two consecutive stages of development: microsporogenesis and microgametogenesis. The modes of the inheritance of plastids and mitochondria are mainly determined by the pattern of their distribution and transmission during microgametogenesis or fertilization (Schröder and Oldenburg 1990; Sodmergen et al 2002). To the best of the authors’ knowledge, this is the first description of the development of pollen grains in T. erecta This plant was regarded as a potentially invasive species in Europe. During microsporogenesis in meiotic cells, in addition to karyokinesis and cytokinesis, autonomic organelles (plastids and mitochondria) are displaced and separated into the daughter cell. Whole flower buds were used, and their single anthers were collected at various stages of development. The terminology used to describe the different exine layers of T. erecta is defined according to Hesse et al (2009)
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
