By K. Faegri and L. Van Der Pijl (Auth.)
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Additional info for Principles of Pollination Ecology
Take, for instance, the common situation in which poUen tubes from self-poUen grow slower than tubes from a compatible individual. If both poUen types are placed at the stigma at the same time, as they are in many aUogamous blossoms under natural conditions, the tubes from the other individual wül "outrun" the self-poUen tubes and provided there are enough of them their nuclei wiU carry out all fertUization before the others have arrived. Thus, a condition which would under artificial conditions be without much significance, may in nature be decisive.
We shall see later how similar reHcts are found also in autogamous flowers. Self-incompatibility is not invariably absolute; in fact it varies from 100 per cent to a very slight preference for foreign pollen. g. in Fumariaceae, or in many Papilionaceae. Both incompatibiUty and so-called pseudo-compatibility systems may be due to various factors. Topographically, incompatibility systems can affect the following functions: (1) pollen-stigma interaction, (2) growth of the pollen tube towards the ovule, and (3) the fusion of nuclei (cf.
G. the effect of bud pollination (before the incompatibility system has built up; an example in de Lange et al. 1974), or the effect of late-anthesis pollination (after break-down of such substances, cf. Ascher and Peloquin 1966). Some unexplained effects of mass pollination by incompatible pollen may also be explained by chemical pollen - stigma interaction. It is more difficult to see if there can be any connection with the alleged difference between autogamy, geitonogamy on the same plant, and clonal geitonogamy.
Principles of Pollination Ecology by K. Faegri and L. Van Der Pijl (Auth.)