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  • 1
    Electronic Resource
    Electronic Resource
    Genotypic Variation for Cold Tolerance among Twelve Maize (Zea mays L.) Populations (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 97 (1986), S. 0 
    Details
    ISSN: 1439-0523
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: The objectives of this study were (1) to ascertain the genetic differences for cold-tolerance traits in a series of diallel crosses among 12 maize populations grown in field experiments, and (2) to compare, in controlled environment rooms, the modification of various metabolic parameters of two sets of four F1 variety crosses which, according to the field experiments, differed largely in seedling early vigour (cold-tolerant [Ct] vs cold-sensitive [Cs] Fl sets). Under field conditions, cold-tolerance adaptability, as monitored by shoot dry matter accumulation, appeared genetically controlled; moreover, considerable differences existed among genotypes. Field data suggested that shoot dry weight was a good indicator of plant adaptability to periods of unfavorable cool conditions. The growth-chamber experiments showed that shoot dry weights of the two sets of hybrids (Ct vs Cs), were more uniform at the highest temperature regimes than under suboptimal temperatures. Moreover, the laboratory study indicated that the interval of time of attain a specific stage of development provided a meaningful and useful criterion for differentiating the capacity of maize plants to grow at low temperatures. Although a clear association between a particular metabolite and the capacity of plants to grow at low temperatures was not observed, it was of interest to note that the total N concentration in the shoot was significantly higher in the Ct plants compared to the Cs ones.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0523.1986.tb01295.x
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  • 2
    Electronic Resource
    Electronic Resource
    A Major Gene for Delayed Senescence in Maize. Pattern of Photosynthates Accumulation and Inheritance (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 97 (1986), S. 0 
    Details
    ISSN: 1439-0523
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: A description is given of the major modification induced in the pattern of photosynthates accumulation by the delayed senescence behaviour of the maize inbred line Lo87602. The major effects noted are: (1) high water and chlorophyll contents in leaves at physiological maturity, (2) high sucrose content in the stalk during grain filling, (3) busks and cobs with more water, sucrose and proteins, (4) high protein content in the grain. The high level of sucrose in the stalk at physiological maturity protects the plant from stalk rotting organisms.The delayed senescence phenotype depends on a major dominant gene, the same genetic factor which favours the accumulation of a high level of sucrose in the stalk.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0523.1986.tb01053.x
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  • 3
    Electronic Resource
    Electronic Resource
    Action of the opaque-7 mutation on the accumulation of storage products in maize endorsperm
    Amsterdam : Elsevier
    Plant Science Letters 14 (1979), S. 345-354 
    Details
    ISSN: 0304-4211
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/S0304-4211(79)90317-1
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  • 4
    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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  • 5
    Electronic Resource
    Electronic Resource
    Leaf peroxidase activities in tomato mutants affecting plant morphology (1974)
    Springer
    Biochemical genetics 12 (1974), S. 181-198 
    Details
    ISSN: 1573-4927
    Keywords: Lycopersicon esculentum ; peroxidases ; isozymes ; genetic control
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The leaf peroxidase activity and the electrophoretic banding pattern of 69 tomato mutants affecting plant morphology have been studied. The zymograms of 63 mutants were normal, and their total peroxidase activities were not correlated with a particular plant or leaf trait. However, six mutations, lyrate x-1521, mottled, olivacea, monstrosa, extreme dwarf, and Curl, are characterized by one or two isozymic bands more intensely stained than in the normal electrophoretic pattern; concomitantly, their total peroxidase activities increase significantly, reaching, in the mutant olivacea, a value forty fold higher than in nonmutant stocks. These abnormal levels of total peroxidase activity are achieved by a promotion of the constitutive bands A5 or C2, singularly or simultaneously. It may be inferred that the six abovementioned mutations influence directly or indirectly the peroxidase activity level without affecting the genes which code for the peroxidase isozymes themselves. Parallels between the mutant effects on specific peroxidase bands and hormonally mediated control of the peroxidase isozymes are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00486088
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  • 6
    Electronic Resource
    Electronic Resource
    Mucronate, Mc, a dominant gene of maize which interacts with opaque-2 to suppress zein synthesis (1983)
    Springer
    Theoretical and applied genetics 65 (1983), S. 123-128 
    Details
    ISSN: 1432-2242
    Keywords: Maize endosperm ; Zein ; High-lysine genes ; Storage proteins
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary This paper describes a new dominant mutation of maize, Mc, which interferes in the endosperm with the synthesis of storage proteins. The mutant is characterized by an opaque phenotype; it reduces the deposition of zein and it increases the level of methionine. The mutation is specifically related to storage protein synthesis since soluble and insoluble carbohydrates are present at normal levels. The main interest of this mutant lies in its synergistic interaction with opaque-2 in repressing zein synthesis. In the double mutant o2Mc the accumulation of zein is reduced to less than 10% of that of the normal endosperm. The control on zein synthesis exerted by the double mutant is at the level of production or stability of translatable zein mRNAs. The double mutant o2Mc germinates well offering the opportunity of using it in biochemical and molecular studies related to storage protein synthesis; the reduced endosperm weight of o2Mc negates its practical utilization in breeding maize for quality.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00264879
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  • 7
    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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  • 8
    Electronic Resource
    Electronic Resource
    Recurrent selection for seed quality traits in an opaque-2 maize population (1985)
    Springer
    Euphytica 34 (1985), S. 857-863 
    Details
    ISSN: 1573-5060
    Keywords: Zea mays ; maize ; phenotypic recurrent selection ; kernel quality traits ; modified opaque-2 types ; correlated responses ; mass selection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The aim of this research was to evaluate the response to phenotypic recurrent selection for four seed quality traits, i.e. protein content, dye binding capacity, tryptophan content, and specific weight, in a modified opaque-2 population of maize (Zea mays L.). Changes in other agronomic traits were also studied. Four selection cycles, using as selection criterion an index constructed from the four seed quality traits, were completed on an individual plant basis. The material from each cycle and from testerosses of each cycle with a homozygous opaque-2 tester was grown for two consecutive years to evaluate the progress due to selection. The results showed that four cycles of recurrent selection induced sizeable variations among cycles for all selected traits. The rate of progress for the four seed quality traits was nearly linear. Further-more, theldata show that improvement in seed-protein related traits had no negative effects on grain yield and kernel weight, when evaluated as the mean performance of testerosses. There was also no appreciable alteration in the other agronomic traits caused by selection for seed quality traits.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00035424
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  • 9
    Electronic Resource
    Electronic Resource
    Genetic variation for traits relating to nitrogen content of maize stalks (1991)
    Springer
    Euphytica 52 (1991), S. 91-98 
    Details
    ISSN: 1573-5060
    Keywords: Zea mays ; maize ; genetic variation ; nitrate accumulation ; N use efficiency
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The objective of this research was to obtain information about expression of genes controlling N concentration in the lower stalk internodes of maize at silking stages and in two other stages during the grain filling period. The inheritance of nitrate-N concentration, total N concentration, and the nitrate-N/total N ratio in the lower stalk internodes was measured in an eight-line diallel cross experiment and in an experiment involving segregating generations. The results show that the parameters examined, particularly nitrate-N concentration, are genetically controlled and that maize plants differ in this respect. Moreover, the magnitude of the general combining ability effects in relation to the size of specific combining ability obtained from the diallel analysis and the mean squares of the analysis of variance of generation means indicated additive heritability of nitrate-N concentration and other N-related traits in maize stalks. These findings suggest to us that a cyclic selection program in maize should be effective in modifying the level of N-related traits concentration in the stalks.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00021320
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