Unilateral incompatibility

Unilateral incompatibility is a phenomenon in which self-compatible species can be crossed as a female, but not as a male, to self-incompatible species (Abdalla and Hermsen, 1972). Pollen tubes fail to penetrate stylar tissue in self-incompatible (female) X self-compatible (male) crosses. Although most diploid Solarium species are self-incompatible, the Mexican species S. verrucosum is self-compatible. Dinu et al. (2005) found that S. verrucosum could be crossed as a female, but not as a male, to self-incompatible species. It is sometimes possible to find exceptional plants that do not exhibit unilateral incompatibility in self-incompatible X selfcompatible interspecific crosses (Pandey, 1962). The identification of such plants allows a breeder to overcome the unilateral incompatibility crossing barrier. For example, exceptional plants ( acceptors ) that accept S. verrucosum pollen and produce fertile hybrids have been reported (Eijlander et al., 2000). It is interesting that some acceptor plants will accept pollen... 

I] nternational law places great importance on the territorial integrity of national states and, by and large, leaves the relation of a new state to be determined by the domestic law of the existing state of which the seceding entity presently forms a part. Where, as here, unilateral secession would be incompatible with the domestic constitution, international law is likely to accept that conclusion. 

The Government of the Republic of Cuba considers that, under the provisions of article XI of the Convention, the unilateral application by a State party to the Convention against another State party of any restriction which would restrict or impede trade and the development and promotion of scientific and technological knowledge in the field of chemistry for industrial, agricultural, research, medical, pharmaceutical or other purposes not prohibited under the Convention, would be incompatible with the object and purpose of the Conventiorr... 

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