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 chain on genetics, emphasizes the variety of genetic reviews. Articles hide the filamentous fungus neurospora, biogenesis of yeast ribosomes, evolutionary genetics of fish, drosophila transposable parts and the dropophila gene zeste.

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19721, who found that a methanol extract of the mentor from P . alba pollen. , 1987). A possible explanation for the mentor and pioneer effects may be the interaction between the pollen and ovary. In the simplest case, pollen of Petunia hybrids exhibits a biphasic pattern of growth. Growth is first slow and apparently autotrophic, that is, largely dependent on reserves carried by the pollen (Brewbaker and Kwack, 1963; Rosen, 1971; Mulcahy and Mulcahy, 1983). This is followed by a faster growth phase, presumably sustained by stylar inputs.

Pollination induces a general redistribution of organic compounds within the flower; the style receives compounds mobilized from the stamens, corolla, and calyx (Linskens, 1974). The effect is less pronounced when self-pollen, rather than nonself-pollen, is used. It is not known if all compatible pollen is equally effective in causing this distribution, but differences would certainly create different stylar conditions. These, in turn, could modify the relative competitive abilities of different pollen types.

While the sporophytic average fitness change rate is not affected when prezygotic and postzygotic factors are uncorrelated (Hartl, 1970b), drive elements with better fitness than normals (positive correlation) reduce the substitutional load through the process of gene replacement and accelerate the accumulation of beneficial elements in a population (Hiraizumi, 1964). GENETICS O F ANGIOSPERM POLLEN 41 Most of the experimental results reported in the previous sections (gametophytic selection experiments; distorted segregations) indicate positive correlations between the sporophytic and the gametophytic effects of the genes expressed in both phases of the life cycle.

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