Download Advances in Genetics, Vol. 26 by John G. Scandalios, Theodore R.F. Wright, John G. Scandalios PDF

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 hide the filamentous fungus neurospora, biogenesis of yeast ribosomes, evolutionary genetics of fish, drosophila transposable components and the dropophila gene zeste.

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Snow found that the average individual pollen deposition consisted of 20-24 tetrads and also that 20-30% of the flowers received more than one deposit. Of those receiving >30 tetrads, 23% received pollen on two consecutive days. Since the first pollen deposit would very likely use most, but possibly not all, of the 18-37 (mean = 20) ovules per ovary, pollen of the second deposit would likely experience very intense competition for the remaining unfertilized ovules. Thus a 10% excess of pollen might indicate a very limited degree of pollen tube competition, when, in reality, 90% of the ovules was fertilized without pollen tube competition and the remaining 10% was fertilized under conditions of fairly intense competition.

The sixth variable will also influence competition between pollen tubes of separate visits. The GENETICS OF ANGIOSPERM POLLEN 35 greater the variance, the greater will be the probability that rapidly growing pollen tubes from late arrivals will be able to overtake the slowest tubes of early deposits. The importance of the last variable is obvious. In G . 2 mmlhour. Since flowers of that species each contain 10 ovules (only half of which yield seeds), 20 pollen tubes will probably suffice to effect complete seed set.

For these characters, selection studies require suitable experimental designs by which the effects of genes controlling mechanisms acting at the tissue or plant level are experimentally controlled. Another possibility for the efficient monitoring of the response to MGS can be based on the analysis of differential transmission of molecular markers as isozymes and restriction fragment length polymorphisms (RFLPs), which, being essentially neutral, can be used to detect, in selected progeny, chromosome segments carrying genes implied in the determination of the selected characters.

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