The change in disposition of plastids and mitochondria during microsporogenesis and sporogenesis in some higher plants

In microsporocytes of Stangeria, Impatiens and Tradescantia and in sporocytes of Equisetum all plastids and mitochondria aggregate for a short period at one side of the early prophase I nucleus. Later the organelles disaggregate and during metaphase I and anaphase I they organelles migrate towards the equator of the cell. In Impatiens, Clarkia, Lysimachia and Equisetum all these organelles aggregate in the equatorial plane, thus dividing a dyad into two parts. After meiosis II the equatorial aggregation of organelles is reshaped and divides a tetrad into four parts. Inside the aggregation of organelles, cell plates are simultaneously set up.