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  • 1
    Electronic Resource
    Electronic Resource
    Indoleacetic Acid Oxidase Activity in Two High-Peroxidase Tomato Mutants (1978)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 42 (1978), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Homogenates of tomato (Lycopersicon esculentum Mill.) tissues oxidize IAA at a rate proportional to their peroxidase activity. Moreover, isoproteins with peroxidase activity catalyze also the oxidation of IAA. Two monogenic recessive mutations, olivacea and monstrosa, are involved in the control of the peroxidase-IAA oxidase activity. In olivacea leaflets this activity is 15 times that of the normal; all the aerial organs of monstrosa show high activities, particularly the midrib. These high activities depend on the enhancement of the organ-specific isoenzymes and on the derepression of the root isoenzyme band C2. This latter peroxidase-IAA oxidase band is present in olivacea and monstrosa leaflets, in monstrosa stems and, less intensely stained, in monstrosa midribs. The reduction in length and weight of mutant organs and their epinastic and geotropic-like behavior are associated with high peroxidase-IAA oxidase activities and with the derepression of the root-specific band C2. These results suggest an important role of the peroxidase-IAA oxidase system in controlling the metric relationships among different organs of the plant. Olivacea and monstrosa are to be viewed as auxin-related mutations controlling the synthesis of a group of proteins related in function.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1978.tb01544.x
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  • 2
    Electronic Resource
    Electronic Resource
    Free sugar fraction of the amylose-related mutants of maize (1979)
    Springer
    Biochemical genetics 17 (1979), S. 405-414 
    Details
    ISSN: 1573-4927
    Keywords: Zea mays L. ; amylose synthesis ; genetic control of amylose synthesis ; amylolytic products
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The free sugar fraction of normal and amylose-related mutants of maize has been studied. The mutant waxy, characterized by a starch deprived of amylose, does not differ from the normal maize so far as free sugars are concerned. We report, however, the presence of maltose in waxy extracts, a disaccharide otherwise supposed to be absent in this genotype. Three high-amylose mutants (amylose extender, dull, and sugary-2) can be differentiated on the basis of the content of free sugars: dull and sugary-2 enhance amylose synthesis without inducing the presence of starch amylolytic products, while amylose extender accumulates a large quantity of maltose and maltooligosaccharides with a degree of polymerization between 3 and 8. In developing endosperm of amylose extender an abnormal amylolytic activity may be responsible for the observed abnormalities in free sugars and starch characteristics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00498879
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  • 3
    Electronic Resource
    Electronic Resource
    Glossy mutants of maize. VIII. Accumulation of fatty aldehydes in surface waxes of gl5 maize seedlings (1978)
    Springer
    Biochemical genetics 16 (1978), S. 1015-1021 
    Details
    ISSN: 1573-4927
    Keywords: Zea mays L. ; surface waxes ; fatty alcohol and fatty aldehyde syntheses
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract In corn seedlings (Zea mays L.) homozygous for the mutation gl5, the surface waxes are characteristically altered. In this mutant the main wax constituents (83.5%) are aldehydes while in the normal waxes alcohols predominate (62.7%). Moreover, in the normal waxes aldehydes and alcohols are made up mainly of the C32 term (99%), whereas in gl5 waxes the principal aldehyde is still C32 (90.7%) but the free alcohol composition pattern is noticeably modified. Here the predominant terms are C24, C26, and C28, with C32 representing only 16.6% of the total. The results indicate that the mutant induces a block in the synthesis of fatty alcohols while accumulating fatty aldehydes, the substrates from which the alcohols originate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00483751
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  • 4
    Electronic Resource
    Electronic Resource
    Linkage relationships between regulatory and structural gene loci involved in zein synthesis in maize (1978)
    Springer
    Theoretical and applied genetics 52 (1978), S. 263-267 
    Details
    ISSN: 1432-2242
    Keywords: Zein synthesis ; Gene regulation ; Opaque-2 ; linkage relationships
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The synthesis of at least 15 zein polypeptides is under the control of regulatory gene loci. One of these, Opaque-2 (chromosome 7, position 16) strongly reduces the zein accumulation without modifying the zein molecular components. The linkage relationship between the regulatory gene 02 and the 5 structural loci (Zp1, Zp2, Zp3, Zp6, Zp12) segregating with sample Mendelian ratios have been studied. Zp1, Zp2, Zp3 are closely linked to each other; moreover this gene cluster is located on chromosome 7 at 5.5 cM from the Opaque-2 locus. The structural loci Zp6 and Zp12 are not linked with each other, with the 02 locus or with Zp1, Zp2, Zp3. From our data it follows that the zein structural genes are located in at least three positions on the maize genome. The scattering in the genome of the genes controlled by the Opaque-2 locus suggests a transacting role for this regulatory element.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00303503
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  • 5
    Electronic Resource
    Electronic Resource
    Seed quality differences between normal, floury-2 and opaque-2 maize inbreds (1978)
    Springer
    Euphytica 27 (1978), S. 411-417 
    Details
    ISSN: 1573-5060
    Keywords: Zea mays L. ; maize ; floury-2 ; opaque-2 ; seed quality traits
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary 142 inbreds of maize (Zea mays L.) and their fl2 and o2 versions, have been compared for seed quality traits. On average, fl2 is superior to the normal and o2 maizes in protein and oil contents and intermediate between normal and o2 in tryptophan content and DBC value. The introduction of the two mutant alleles drastically enhances the variation of the quality traits DBC value and tryptophan content. In association with the higher protein content of the fl2 versions, this effect makes it possible to identify a group of fl2 genotypes with high protein content (14.06%) and high DBC value (65.55), tryptophan content (1.32%) and oil percentage (5.92%).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00043166
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Seed size inheritance in a cross between wild and cultivated common beans (Phaseolus vulgaris L.) (1978)
    Springer
    Genetica 49 (1978), S. 31-36 
    Details
    ISSN: 1573-6857
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00187811
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  • 7
    Electronic Resource
    Electronic Resource
    Growth analysis in a reduced leaf mutant of common bean (Phaseolus vulgaris L.) (1979)
    Springer
    Euphytica 28 (1979), S. 593-600 
    Details
    ISSN: 1573-5060
    Keywords: Phaseolus vulgaris ; common bean ; EMS ; leaf mutant ; mutation breeding ; growth analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A comparison between the Royal Red bean variety and a reduced leaf mutant on the basis of growth indices is reported. The mutants has lower leaf area index (LAI) and leaf area duration (LAD) (−43.7%), higher specific leaf weight (SLW) (on the mean +33.3%) and accumulates less dry matter (−7.7%) than the normal genotype. When the net assimilation rate (NAR) is considered, the mutant is superior to the normal (+62.3%). It is concluded that the unit area of the mutant leaves accumulates dry matter more efficiently than that of the corresponding normal variety.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00038925
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