Generative cells

Roshchina, V.V. and Melnikova, E.V. (1998). Allelopathy and plant generative cells. Participation of acetylcholine and histamine in a signalling at the interactions of pollen and pistil. Allelopathy Journal 5 171-182. 

Roshchina, V. V. and Melnikova, E. V. (1996). Microspectrofluorometry A new technique to study pollen allelopathy. Allelopathy Journal 3 51-58 Roshchina, V. V. and Melnikova, E. V. (1998). Allelopathy and plant generative cells Participation of acetylcholine and histamine in signaling interactions of pollen and pistil. Allelopathy Journal 5 171-182 Roshchina, V.V. and Melnikova, E. V. (1999). Microspectrofluorometry of intact secreting cells applied to allelopathy. ln Principles and Practices in Plant Ecology., Inderjit, K. M. M. Dakshini, and C. L. Foy (eds) pp. 99-126. CRC Press, Boca Raton, Florida, USA. 

Pathway 11 An asymmetric initial division produces two cells of unequal size. The ball of cells may originate from the continued division of the larger vegetative cell while the smaller generative cell may divide a few times before degenerating. 

Pathway IH Following an initial asymmetric division, the generative cell divides successively yielding the multi-ceUular state. The vegetative cell remains arrested in division. 

Pathway IV Following an initial asymmetric division, both vegetative and generative cells will be equally active and divide to give rise to the multi-cellular structure. 

Selection is the main method of the ergot breeding for the field production. It can start both from vegetative as well as generative cells of Claviceps purpurea. Single sclerotium selection was started by a collection of wild growing materials... 

Sauter and Marquardt followed RNA and protein synthesis as well as changes in the stock of histones in more detail in the two cells in peonies. They found active RNA and protein synthesis in the vegetative cells. Their cytoplasm produced a strong coloration due to arginine-rich histones which were apparently localized on th ribosomes. In the generative cells practically no RNA and protein synthesis could be detected. The... 

Fig. 189. Unequal cell division in the first pollen mitosis of lilies and further pollen development, g = generative, v = vegetative cell. The generative cell undergoes a second mitosis to give two sperm cells or nuclei (sp) which first occurs during outgrowth of the pollen tube (from Walter 1962).

Like other members of the genus Pinus, the haploid number of chromosomes is 12 in western white pine (Saylor and Smith, 1966). Chloroplasts are inherited predominantly paternally, while mitochondria are primarily inherited maternally, although some biparental inheritance of organelles can occur (White, 1990 Owens and Bruns, 2000). At the time of fertilisation, maternal plastids are excluded from the neocytoplasm but maternal mitochondria remain. Paternal chloroplasts and a small number of paternal mitochondria are released into the egg from the pollen tube with cytoplasm from the tube cell and generative cell. Maternal mitochondria migrate to and aggregate in the perinuclear zone at the time of fertilisation (Bmns and Owens, 2000). 

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