microgametophyte


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microgametophyte

[¦mī·krō·gə′mēd·ə‚fīt]
(botany)
The male gametophyte in plants having two types of spores.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Sizes of natural microgametophyte populations in pistils of Phlox drummondii.
Most major cytogenetic deficiencies in cotton (Gossypium hirsutum L.) induce sporophytic semisterility due to the production and segregation of genetically unbalanced microgametophytes. Such chromosome deficiencies are not pollen-transmissible because the chromatin-deficient pollen is normally not functional (Endrizzi et al., 1984; McCormick, 1993).
This phenomenon may be due to deposition of inviable or incompatible pollen, effects of pollen position (Thomson 1989), clogging of the stigma and style (Bawa and Opler 1975), or microgametophyte interactions in the style (Cruzan 1990).
In Mimulus guttatus copper tolerance is expressed in both the diploid sporophyte and the microgametophyte (Searcy and Mulcahy, 1985a).
The backcrossing process used in cotton is facilitated by this differential transmission between mega- versus microgametophytes.
Further, genetic correlation between sporophytic and gametophytic traits has been demonstrated for pollen-tube growth and seed size (Mulcahy 1971) and pollen-tube growth and seedling height in Zea mays (Mulcahy 1974), as well as low temperature tolerance by [TABULAR DATA FOR TABLE 6 OMITTED] microgametophytes and sporophytes in hybrids of L.
We obtained an estimate of Nm from the paternity analysis by multiplying the rate of gene flow by 0.5 (to compensate for the haploid nature of microgametophytes) and the number of individuals per population.