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  • 1
    Electronic Resource
    Electronic Resource
    Isolation of an amylose-free starch mutant of the potato (Solanum tuberosum L.) (1987)
    Springer
    Theoretical and applied genetics 75 (1987), S. 217-221 
    Details
    ISSN: 1432-2242
    Keywords: Solanum tuberosum ; Mutant ; Starch composition ; Granule-bound starch synthase ; amylose-free
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary An amylose-free potato mutant was isolated after screening 12,000 minitubers. These minitubers had been induced on stem segments of adventitious shoots, which had been regenerated on leaf explants of a monoploid potato clone after Röntgen-irradiation. The mutant character is also expressed in subterranean tubers and in microspores. Starch granules from the mutant showed a strongly reduced activity of the granule bound starch synthase and loss of the major 60 kd protein from the starch granules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00249167
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  • 2
    Electronic Resource
    Electronic Resource
    Isolation of a nitrate reductase deficient mutant of Pisum sativum by means of selection for chlorate resistance (1980)
    Springer
    Theoretical and applied genetics 58 (1980), S. 39-42 
    Details
    ISSN: 1432-2242
    Keywords: Pea ; Chlorate resistance ; Nitrate reductase deficient ; Mutant
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary After EMS treatment of seeds of the Pisum variety ‘Rondo’ a chlorate resistant mutant was isolated which showed a decrease in the in vitro activity of the enzyme nitrate reductase of roughly 95%. The mutation is monogenic and recessive. The mutant shows a decrease in protein content, and an increase in the amount of nitrate accumulated and in the activity of the enzyme nitrite reductase. On a liquid nutrient medium containing nitrate as the sole nitrogen source and in soil, the mutant grows very poorly due to necrosis of the leaves. On liquid medium containing ammonium, either with or without nitrate, growth is as good as that of the parent variety.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00264667
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  • 3
    Electronic Resource
    Electronic Resource
    Increased frost tolerance and amino acid content in leaves, tubers and leaf callus of regenerated hydroxyproline resistant potato clones (1987)
    Springer
    Euphytica 36 (1987), S. 369-380 
    Details
    ISSN: 1573-5060
    Keywords: Solanum tuberosum ; potato ; amino acids ; amino acid analogue resistance ; frost tolerance ; plant regeneration ; proline ; somaclonal variation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A number of previously selected hydroxyproline (hyp) resistant cell lines of a diploid potato (Solanum tuberosum L., clone H2578, 2n=2x=24) could be regenerated into plants which were further analysed. Hyp resistance, although lower than in the originally selected calli, was still present in regenerated shoots and in callus initiated from these shoots and it was not lost upon (mini)tuber propagation. Regenerated shoots showed a wide range of phenotypic variation. The chromosome number, analysed in 4 clones, appeared to be hypotetraploid (44 or 45). Tuber-propagated regenerants generally showed increased frost tolerance both at the plant and the cell level. In leaves this seemed to be associated with increased levels of both proline and total amino acid content. However, in callus only the total amino acid content but not proline was still elevated. In the wild type the frost tolerance of the tubers appeared to be lower than that of the leaves. Between tubers of wild type and the hyp resistant regenerants no differences in frost tolerance were found, although proline and total amino acid content tended to be higher in tubers from the regenerants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00041480
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  • 4
    Electronic Resource
    Electronic Resource
    Secondary somatic embryogenesis and applications in plant breeding (1995)
    Springer
    Euphytica 81 (1995), S. 93-107 
    Details
    ISSN: 1573-5060
    Keywords: plant regeneration ; cyclic somatic embryogenesis ; plant breeding ; review
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Secondary somatic embryogenesis is the phenomenon whereby new somatic embryos are initiated from somatic embryos. Such cultures have been described in at least 80 Gymnosperm and Angiosperm species. In the initial step (primary somatic embryogenesis) such cultures have to be started from plant explants. In general, primary somatic embryogenesis from vegetative plant explants is, indirect and mostly driven by auxin (AUX) or auxin and cytokinin (AUX/CYT) supplemented media, whereas, from zygotic embryos it is direct and driven, to a larger extent, by CYT or growth regulator free media. Primary somatic embryogenesis from floral plant explants is between these two extremes. Indirect and direct somatic embryogenesis should be seen as two extremes of one continuum: in indirect somatic embryogenesis the embryos develop up to the (pre)-globular stage and in direct somatic embryogenesis to mature stages before they are subjected to secondary embryogenesis. In general, secondary embryogenesis requires no growth regulators in species with CYT driven primary embryogenesis. Whereas, continuous exposure to growth regulators is needed in species with CYT/AUX or AUX driven primary embryogenesis. In most species somatic embryos can be converted into shoots, although the frequencies are mostly low. In general, somatic embryos induced by growth regulator free or CYT supplemented media meet more difficulties in shoot development than embryos induced by AUX supplemented media. Applications of secondary somatic embryogenesis for plant breeding are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00022463
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  • 5
    Electronic Resource
    Electronic Resource
    Modification of symbiotic interaction of pea (Pisum sativum L.) andRhizobium leguminosarum by induced mutations (1984)
    Springer
    Plant and soil 82 (1984), S. 427-438 
    Details
    ISSN: 1573-5036
    Keywords: Mutant ; Mutation ; Nitrate ; Nitrate reductase ; Nodulation ; Pisum sativum L. ; Rhizobium leguminosarum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary In pea (Pisum sativum L.), mutants could be induced, modified in the symbiotic interaction withRhizobium leguminosarum. Among 250 M2-families, two nodulation resistant mutants (K5 and K9) were obtained. In mutant K5 the nodulation resistance was monogenic recessive and not Rhizobium strain specific. Out of 220 M2-families one mutant nod3 was found which could form nodules at high nitrate concentrations (15 mM KNO3). This mutant nodulated abundantly with severalRhizobium strains, both in the absence and presence of nitrate. Probably as the result of a pleiotropic effect, its root morphology was also changed. Among 1800 M2-families, five nitrate reductase deficient mutants were obtained and one of them (mutant E1) was used to study the inhibitory effect of nitrate on nodulation and nitrogen fixation. The results of the present investigation show that pea mutants which are modified in their symbiosis withRhizobium leguminosarum, can readily be obtained. The significance of such mutants for fundamental studies of the legume-Rhizobium symbiosis and for applications in plant breeding is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02184280
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  • 6
    Electronic Resource
    Electronic Resource
    Induction, germination and shoot development of somatic embryos in cassava (1993)
    Springer
    Plant cell, tissue and organ culture 33 (1993), S. 151-156 
    Details
    ISSN: 1573-5044
    Keywords: cassava ; plant regeneration ; somatic embryogenesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Four Indonesian and two Latin-American cassava genotypes (Manihot esculenta Crantz), were evaluated for their ability to develop somatic embryos from young leaf lobes. All genotypes formed somatic embryos but they differed in the frequency of embryos induced. The best genotypes, M. Col 22 and Tjurug, produced germinating embryos (GE) on 81% (22.1 GE/initial leaf lobe) and 46% (4.3 GE/initial leaf lobe) of the cultured leaf lobes, respectively. Up to 57% of the germinating embryos of M. Col 22 and 12% of Tjurug produced either normal or malformed shoots. Most malformed shoots developed into shoots with normal morphology after prolonged culture. All shoots formed roots after transfer to medium without BAP. Roots of all normal and most malformed regenerants had the original ploidy level (2n=36). Regardless of whether the plants were multipliedin vitro (150 plants) or in the greenhouse (30 plants) there were no morphological differences compared to parent plants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01983228
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