Propagation sexual

Propagation Sexual production of plants from seeds or asexual production through cuttings, grafts, and tissue cultures. 

Recombination is a powerful force in natural evolution it serves to propagate positive traits and eliminate negative traits in progeny. Stemmer has described a method for random gene recombination in vitro, which he calls DNA shuffling or sexual PCR [7.8], Initially, the DNA from a collection of enzyme variants to be shuffled is amplified by PCR. The resulting DNA is... 

In view of the high cost of fruit production, the low success rate of sexual reproduction, and the added vigor and increased shoot number that result from flower and fruit abortion, the question arises why P. peltatum has not abandoned propagation by seed altogether. The persistence of sexual development in mayapple must have demographic implications that... 

Sexually reproduced plants, except fungi, bacteria and first generation hybrids are protected by the 1970 Plant Variety Protection Act or PVPA. This Act provides for the issuance of a certificate of plant variety protection from the Plant Variety Protection Office of the Department of Agriculture which administers the Act. The protection granted provides protection against unauthorized propagation of seed to be sold or used as a propagating material for a period of 18 years. 

Lichen fungi are able to reproduce sexually, as well as asexually. The relative frequency of sexual and vegetative propagation is species specific however, examples of species are known which reproduce sexually on one continent and asexually on another ( species pairs, Poelt, 1970). Few genera of lichen fungi are exclusively asexual, most are either exclusively sexual or possess a mixed reproductive strategy (Bowler and Rundel, 1975). Sexual lichen fungi reproduce with microscopic... 

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