By John G. Scandalios, Theodore R.F. Wright, John G. Scandalios (Eds.)
This quantity in a sequence on genetics, emphasizes the range of genetic reports. Articles disguise the filamentous fungus neurospora, biogenesis of yeast ribosomes, evolutionary genetics of fish, drosophila transposable parts and the dropophila gene zeste.
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Extra info for Advances in Genetics, Vol. 26
1980; Sanford, 1986). Although these studies provided encouraging results, no precise demonstration of stable genetic transformation has been obtained. , 1987). A different method of pollen transformation can be developed by transferring exogenous DNA in isolated sperm cells to be used for in uitro fertilization. Techniques to obtain isolated sperm cells have been studied in wheat and maize and in Gerbera (Southworth and Knox, 1987). GENETICS OF ANGIOSPERM POLLEN 47 VII. Conclusions At least four phenomena in the ontogeny of pollen impinge on the genetic determination of pollen quality: cytoplasmic interconnections which establish developmental synchrony among meiocytes, callose envelopes which isolate microspores from each other, tapetal deposits which coat the pollen exine, and sporophytic inputs which remain in the meiocyte cytoplasm.
This should be particularly so with inbred lines of small populations, where time has allowed natural selection to adjust the content of pollen and styles. Once within the style, pollen tubes are subject to a variety of influences: other pollen tubes, inherent qualities of the style, and stylar qualities developed in response to these and other pollen tubes. In Epilobium canum, the probability of a pollen grain producing a pollen tube is independent of the number of grains on the stigma (at least, from 4 to 40 grains).
One system, seen in T . mengessii, is a mechanism which delays the germination of pollen. This would mean that the outcome of pollen tube competition would be determined more by pollen tube growth rate, and less by chance time of pollen arrival on the stigma. With delayed pollen germination, greater numbers of pollen grains are able to compete effectively than would be the case without that delay. The requirement in L. Zeucocephala, for a minimal number of pollen grains on the stigma before the pollen germinates may serve a comparable function of intensifying pollen tube competition.