During the meiosis of microspore mother cells(MMC),the most cells display abnormal chromosomes:some chromosomes moved out of the spindle of the cell at metaphase;some chromosome bridges and.

In the primary stage microspore mother cell formed with arranging in two rows of cells.

Primary sporogenous celle wasformed in the late August (1992);microspore mother cells (MMC) were formed in theearly Novemberl next year (1993),in the middle of February tetrad was formed;microspores were released from tetrad in the late February;mature pollen grain was formedand began shedding in the middle of March;pollen grain germinated in the early April;generative cell divid.

The meiotic behavior of three species of the genus Picea was investigated using pollen mother cells(PMCs).

Observations on abnormal meiosis of pollen mother cells in Lilium davidii var.unicolor;

davidiana approximately experience 6 months from pollen mother cell to mature pollen grain and survive in winter in the form of pollen mother cell.

was studied through the observation of meiosis and the microspore development of its pollen mother cells(PMCs).

Change of callose wall synthesis during formation and development of microsporocytes in Secale cereale;

In the restorer line, Ce64, the developing microsporocytes have dense cytoplasm and a distinct set of circumferential microtubules around the nucleus.

From packytene to telophase Ⅱ, there are cytoplasmic channels between nei bouring microsporocytes so that the.

During the meiotic process of megasporocyte,the ribosome population diminished greatly in prophase I and restored in metaphase I;plastids and mitochondria turned unclear (dedifferentiation) in prophase I and recovered their normal structures (redifferentiation) in metaphase I.