Titlebook: Angiosperm Pollen and Ovules; E. Ottaviano,M. Sari Gorla,G. Bergamini Mulcahy Conference proceedings 1992 Springer-Verlag New York, Inc. 1

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MUT

Plastid Developmental Pathways in Some Angiosperm Reproductive Cellsastid types appear; in angiosperm at least five plastid types are recognized: proplastid, amyloplast, chloroplast, chromoplast, elaioplast (Schnepf, 1980). Some authors such as Whatley (1977) distinguish seven types. The number per cell in angiosperm is high and constant for each cell type (Butterfa

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The Role of the Pollen Grain Coating in Pollination and Self-incompatibility in ,arrison, 1968; Dickinson and Lewis, 1973b; Dickinson, 1973) and enzymic properties (Knox and Heslop-Harrison, 1970; Vithange and Knox, 1976) have been reported. In some species, however, there is strong circumstantial evidence that these coatings are involved in systems of self-incompatibility (SI)

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Molecular Genetics of Gametophytic Self-incompatibility in Solanaceaellelic locus called the S-locus. (For a comprehensive treatise on the self-incompatibility system refer to the monograph by de Nettancourt, 1977.) Fertilization is blocked when the S-allele carried by the pollen matches one of the two alleles carried by the pistil. Incompatible pollen initially germ

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Molecular Genetics of Self-incompatibility in,is controlled by a multi-allelic, single gene, the S-gene. The system operates to enhance outcrossing and to ensure that a plant is fertilized by a genetically distinct individual of the same species. There are two major types of self-incompatibility. The most widespread is gametophytic self-incompa

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Recognition, Signals, and Pollen Responses in the Incompatibility Reaction in,liest stages in the process of fertilization is the recognition, and acceptance or rejection, of pollen grains alighting on the stigma of the recipient plant. Self- incompatibility (SI) involves these processes. We are particularly interested in the mechanism whereby incompatible pollen is inhibited

MEET

Self-incompatibility Products of the Male Partner in,ized (Nasrallah and Nasrallah, 1984; Takayama et al., 1986). The gene encoding these S molecules (the SLG gene for S locus glycoproteins) has been shown to belong to a multigenic family consisting of about 12 homologous copies among which at least two other members are expressed, namely the S-locus

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Gametophytic Incompatibility in,: Molecular Aspects of Male Gametophyte and Female; Sporophyte Interes of pistil. Pollen carried to the stigma surface of the pistil produced the tubes that penetrate the stigma and grow through the style to the ovary. In plants with a style like in. the pollen tubes grow between the cells of the central transmitting tract. These cells are arranged in longitudinal f

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