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Targeting Genes for Genetic Manipulation in Crop Species,llelic variation within the species, or by the introduction of novel alleles or ‘new’ genes from outside of the species. In essence, the technologies to achieve this are already developed or are, presently, in an advanced state of development. First, the technologies for interplant, within species,

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Incompatibility Barriers Operating in Crosses of , with Related Species and Genera,8). Six genomes have been identified, found either as diploids or allotetraploids; AA, BB, BBCC, CC, CCDD, EE, and FF. . is assumed to have the AA genome. Five additional species, whose genomic composition is unknown, have been identified (Table 1).

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,Induced Mutations — An Integrating Tool in Genetics and Plant Breeding,iability for breeding or basic research. The wide use of model plant mutants, in studies of molecular organization of genomes or of metabolic pathways, has stimulated interest to utilize these techniques in crop improvement by conventional or molecular genetic methods. During the approximately 60 ye

Ebct207

, Culture of Rice: Transformation and Regeneration of Protoplasts, yields must increase by over 5 million tons per year just to maintain current levels of rice consumption per person (IRRI, 1985). Because of the importance of rice production, extensive research efforts and progress have been made during the last 30 years to improve yields. Most of this research ha

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, Manipulation of Barley and Other Cereals,re by supplementing the present activities of plant breeders in expanding and diversifying the gene pool of crop species and in speeding up the breeding process. Different strategies are used which apply . methods to generate diversity within existing populations, to identify rare, but desired indiv

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Genetic Transformation of Maize Cells by Particle Bombardment and the Influence of Methylation on Flts from these studies of the structure of plant gene regulatory regions have been reviewed recently (Schell, 1987; Willmitser, 1988). Additionally, the development of techniques for transferring genes into crop plants allows new agronomic traits to be introduced (Goodman et al., 1987). Recently, re