(a.) The condition of having two or more kinds of flowers which differ in regard to stamens and pistils, as in the aster.
(a.) Characterized by heterogamy.
Example Sentences:
(1) It is proposed that, by reducing mating speed, inbreeding changes the rate of this sequence but not its pattern, so the apparent level of heterogamic mating will increase during inbreeding, for a fixed observation period.
(2) Heterogamous marriages, by contrast, show a higher divorce rate and tend to leave therapy prior to termination.
(3) In a multiple-choice mating between two genotypic strains differing in their level of sexual vigor, there is a sequence from heterogamic to homogamic mating.
(4) Observations on the genesis of the ascus by light microscopy and transmission electron microscopy provide no evidence for, what some earlier workers in this field have presumed to be, heterogamous conjugation between a mother cell and its bud.
(5) This principle states that a biallelic polymorphism is maintained if the heterozygote is superior in its degree of "heterogamous self-replication" to the degrees of "autogamous self-replication" of the corresponding homozygotes.
(6) We have observed directly females of Drosophila paulistorum semispecies in choice experiments with both homogamic and heterogamic males.
(7) Younger males increasingly tended to select brides of their own age group until the 1960s, while older males have been increasingly heterogamous since World War II.
(8) Previous heterogamic copulatory experience did not change the degree of sexual isolation; however, females with homogamic copulatory experience showed a significantly higher preference for homogamic males.
(9) An alternative explanation to the pheromonal control of mating through chemoreceptor saturation proposed by Averhoff and Richardson (1974) is offered for the apparent rise in heterogamic mating in their experiments, after several generations of full-sib mating.
(10) Thus these unions are termed "symptom object" relationships and are characterologically heterogamous.
(11) In most of the crosses homogamic matings outnumber heterogamic ones, and deviation from randomness is statistically significant in 11 of 20 crosses.
Pistil
Definition:
(n.) An epistle.
(n.) The seed-bearing organ of a flower. It consists of an ovary, containing the ovules or rudimentary seeds, and a stigma, which is commonly raised on an elongated portion called a style. When composed of one carpel a pistil is simple; when composed of several, it is compound. See Illust. of Flower, and Ovary.
Example Sentences:
(1) Raised levels of atmospheric water cause a variety of responses in self-pollen, ranging from tube growth through the pistil to the ovary, to tubes inhibited at the stigmatic surface, accompanied by the formation of callose.
(2) When applied to sections of the pistil, these antibodies label the intercellular matrix in the stigma and transmitting tissue of the style and the cell walls in the epidermis of the placenta.
(3) We describe in this report the allelic diversity and gene structure of the S locus in Solanum tuberosum revealed by the isolation and characterization of genomic and cDNA clones encoding S-associated major pistil proteins from three alleles (S1, Sr1, S2).
(4) The label is transferred from pistil to pollen tubes apparently via the secretion products (exudate) of the pistil.
(5) The female S-locus gene products for two families showing different types of SI have been putatively identified as major pistil glycoproteins (the S-locus-specific glycoproteins of the Brassicaceae and the S-RNases of the Solanaceae).
(6) LAT52 mRNA is not detectable in pistils, sepals or non-reproductive tissues.
(7) The S-glycoproteins were expressed mainly in the upper part of the pistil and showed an increasing concentration during flower development.
(8) In situ hybridization experiments showed that at least one of these pistil-specific genes is specifically expressed in cells of the transmitting tissue.
(9) The structural events in the stigma and transmitting tissue of Petunia hybrida pistils that accompany compatible and incompatible intraspecific pollinations have been investigated in detail, together with the changes in reserve levels that also take place at this time.
(10) After pollination, the transcript levels of the pistil-specific extensin-like genes change relative to levels in unpollinated pistils.
(11) Compatible and incompatible pollen tubes growing on detached Lilium longiflorum pistils which had been prelabeled with myoinositol-U-(14)C take up a portion of the label and utilize it for biosynthesis of tube wall substance.
(12) The S2- and S3-alleles encode pistil-specific proteins of 30 kDa and 31 kDa, respectively, which were previously identified based on cosegregation with their respective alleles in genetic crosses.
(13) The maximal levels of 9612 RNA detected in anthers and vegetative organs were more than 50-fold and 250-fold lower than the level in pistils, respectively.
(14) The possible roles of the extensin-like proteins in pistils are discussed.
(15) A glycoprotein serologically related to the PR-2,N,O class is a (1,3)-beta-glucanase and is present in pistils.
(16) Here we report the characterization of a gene encoding another pistil ribonuclease of P. inflata, RNase X2.
(17) Double staining with sirofluor allows location of nuclei within pollen tubes grown in vitro, and when used after pollination enables the viewer to discriminate between nuclei within the pollen tube vs. nuclei of the pistil tissue.
(18) In the case of pistils, a pattern of labeling in ovary, style, and stigma is obtained which indicates that products of myoinositol metabolism are utilized in the biosynthesis of exudate (secretion product) of the stigma and style as well as for components of pistil cell walls.
(19) RNA gel blot hybridizations demonstrated the organ-specific expression of the extensin-like genes and their temporal regulation during pistil development.
(20) We have sought to identify pistil-specific genes that can be used as molecular markers to study pistil development.