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  • Electronic Resource  (17)
  • Cell & Developmental Biology  (8)
  • Secale cereale  (5)
  • Lycopersicon esculentum  (4)
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  • Electronic Resource  (17)
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  • 1
    Electronic Resource
    Electronic Resource
    Genetic analysis of salt tolerance during germination in Lycopersicon (1991)
    Springer
    Theoretical and applied genetics 81 (1991), S. 321-326 
    Details
    ISSN: 1432-2242
    Keywords: Lycopersicon esculentum ; Salt tolerance ; Seed germination ; Maternal effects ; Tomato improvement ; Gene action
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The salt-tolerant cultivated tomato (Lycopersicon esculentum) accession, ‘PI174263’, and a sensitive cv, ‘UCT5’, were crossed to develop reciprocal F1, F2 and BC1 populations for genetic analysis of salt tolerance in tomatoes during seed germination. Variation was partitioned into embryo, endosperm and maternal (testa and cytoplasmic) components. Generation means analysis indicated that there were no significant embryo (additive, dominance or epistatic) effects on germination performance under salt stress. Highly significant endosperm additive and testa dominance effects were detected. The proportion of the total variance explained by the model containing these two components was R2=98.2%. Variance component analysis indicated a large genetic variance with additive gene action as the predominant component. Furhter inspection indicated that this variance was attributable to endosperm additive effects on germinability under salt stress. Narrow-sense heritability was estimated as moderately high. Implications for breeding procedures are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00228671
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  • 2
    Electronic Resource
    Electronic Resource
    B-chromosomes in inbred lines of rye (Secale cereale L.) (1994)
    Springer
    Genetica 92 (1994), S. 149-154 
    Details
    ISSN: 1573-6857
    Keywords: Secale cereale ; rye ; B-chromosomes ; fitness ; inbred lines ; parasitic Bs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract B-chromosomes from an experimental population of the Japanese JNK strain of rye, isogenic for its Bs, have been backcrossed into twelve different inbred lines. The experiment provides a way to study the effects of the Bs against a range of homozygous A-chromosome backgrounds. This publication deals with vigour and fertility: it shows that the rye Bs fit a parasitic model, and that they interact in their effects with the A-chromosome background genotype.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00132533
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  • 3
    Electronic Resource
    Electronic Resource
    B-chromosomes in inbred lines of rye (Secale cereale L.) (1996)
    Springer
    Genetica 97 (1996), S. 65-72 
    Details
    ISSN: 1573-6857
    Keywords: Secale cereale ; rye ; B chromosomes ; inbred lines ; pairing ; pollen mitosis ; transmission genotypes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract B chromosomes from an experimental population of the Japanese JNK strain of rye, isogenic for its Bs, have been backcrossed into twelve different inbred lines. The experiment is a way of studying the effects of the Bs against a range of different homozygous A chromosome backgrounds. This publication deals with pairing effects of both the As and the Bs, and their interactions, and with pollen mitosis. At meiosis there is a genotypic component to B effects, and they do not appear to act solely through a physical disturbance within the nucleus. In pollen the Bs are always present in more than 50% of the grains regardless of their pairing behaviour during meiosis; this result fits with a ‘parasitic’ model of the activity of rye Bs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00132582
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  • 4
    Electronic Resource
    Electronic Resource
    Painting rye B chromosomes in wheat: interphase chromatin organization, nuclear disposition and association in plants with two, three or four Bs (1996)
    Springer
    Chromosome research 4 (1996), S. 195-200 
    Details
    ISSN: 1573-6849
    Keywords: B chromosomes ; genomicin situ hybridization ; nuclear architecture ; Secale cereale ; Triticum aestivum cv ; Lindström
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The B chromosomes (Bs) of rye (Secale cereale) have been studied at interphase in terms of their chromatin organization, patterns of nuclear disposition and physical association in plants with two, three, and four Bs. The study was made in the Lindström strain of hexaploid wheat, which carries the rye Bs as an addition line, byin situ hybridization with a B-specific probe and by genomicin situ hybridization (GISH) with rye genomic DNA, enabling whole chromosome painting. Repetive sequences common to the As and Bs of rye allow for visualization of the rye B at interphase in the wheat background. A B-specific probe enables the orientation of two or more Bs to be determined, and the combination of both probes used together gives information on the disposition of the Bs and on their patterns of physical association within the nucleus. The Bs form linear ‘strings’, and the ends of their long arms, which can be detected by the B-specific probe, are usually located within the hemisphere of the nucleus that has the least condensed chromatin. There is dose-dependent association, and even numbers (2B, 4B) have a greater preference for association than odd ones (3B).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02254959
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  • 5
    Electronic Resource
    Electronic Resource
    Analysis of rye B-chromosome structure using fluorescencein situ hybridization (FISH) (1995)
    Springer
    Chromosome research 3 (1995), S. 466-472 
    Details
    ISSN: 1573-6849
    Keywords: B chromosome ; DNA sequence composition ; fluorescencein situ hybridization ; repetitive sequence ; Secale cereale ; translocations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Fluorescencein situ hybridization (FISH) has been used to analyse the structure of the rye B chromosome. Genomicin situ hybridization (GISH) demonstrates the high level of overall similarity between A and B chromosomes of rye, as well as the presence of a number of specific sequences. The B-specific repeat families D1100 and E3900 have been analysed in terms of their physical location and possible contiguity. Rye Bs contain members of the rye-specific dispersed repetitive family R173, as well as centromeric regions similar to those of the As. The B chromosomes analysed in our study lack detectable rDNA sequences. Anomalous results have been obtained with a number of subtelomeric repetitive probes from rye. Bs usually lack these sequences, but evidence is presented that in some cases A–B translocation events may relocate such sequences from the As to the Bs. These data are discussed in the context of current models for the origin of the B chromosome.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00713960
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  • 6
    Electronic Resource
    Electronic Resource
    Improvement of tomato flavor by genetically increasing sugar and acid contents (1983)
    Springer
    Euphytica 32 (1983), S. 845-855 
    Details
    ISSN: 1573-5060
    Keywords: Lycopersicon esculentum ; tomato ; flavor ; sensory evaluation ; soluble solids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Advanced high sugar and acid breeding lines of tomatoes (Lycopersion esculentum Mill.) were rated higher in sweetness, sourness and overall flavor intensity than the standard cultivars Cal Ace or T3. Titratable acidity and soluble solids content were major contributors to differences in overall flavor intensity. The results demonstrate that significant improvement in tomato flavor can be attained by increasing sugar and acid contents in tomato fruits by genetic manipulation. Current evidence indicates that breeding for high soluble solids in horticulturally acceptable tomato cultivars is justified.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00042166
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  • 7
    Electronic Resource
    Electronic Resource
    Generation means analysis of right-censored response-time traits: Low temperature seed germination in tomato (1990)
    Springer
    Euphytica 48 (1990), S. 239-244 
    Details
    ISSN: 1573-5060
    Keywords: Lycopersicon esculentum ; tomato ; cold tolerance ; seed germination ; genetic analysis ; missing data ; response-time data
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary In studies to determine the inheritance of response-time traits, such as time to seed germination, some viable individuals may fail to respond during an experiment. If these right-censored observations are ignored, sample means and variances will be underestimated. This is illustrated using data from time to seed germination at 9°C for Lycopersicon esculentum (Mill.) fast germinating PI 120256, slow-germinating T3 and their reciprocal F1, F2 and backcross progeny. This paper presents methods to detect and to accommodate right-censored data in generation means analysis. Genetic interpretations derived from corrected and uncorrected estimates of generation means and variances are compared. Correction for right-censoring increased estimates of environmental and phenotypic variances, and decreased heritability estimates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00023656
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  • 8
    Electronic Resource
    Electronic Resource
    A greenhouse screening method forPyrenochaeta lycopersici resistance in tomatoes (1989)
    Springer
    Euphytica 40 (1989), S. 187-191 
    Details
    ISSN: 1573-5060
    Keywords: Lycopersicon esculentum ; tomato ; Pyrenochaeta lycopersici ; corky root ; brown root rot ; resistance ; greenhouse screening method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A greenhouse screening method for corky root (Pyrenochaeta lycopersici) resistance in the tomato (Lycopersicon esculentum) is described in detail. In determining the reliability of the method, known resistance sources within wild asccessions, commerical cultivars and breeding lines were evaluated for resistance in fields naturally infested with corky root and their response compared under greenhouse conditions in soil heavily infested with corky root and artifically maintained at temperatures between 10–13°C. The procedure developed can be used year round and improves the efficiency of recovering resistant progeny in large segregrating populations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00024510
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  • 9
    Electronic Resource
    Electronic Resource
    Characterization of low Mr Zona Pellucida binding proteins from boar spermatozoa and seminal plasma (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Molecular Reproduction and Development 33 (1992), S. 108-115 
    Details
    ISSN: 1040-452X
    Keywords: Zona binding proteins ; Seminal plasma ; Fertilization ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: A group of low Mr (16 kDa - 23 kDa) glycoproteins on ejaculated boar spermatozoa have been shown to have high affinity for homologous zona pellucida glycoproteins (ZPGPs). These ZPGP binding proteins are derived from seminal plasma as shown by their absence from epididymal spermatozoa and their presence in seminal plasma as identified by N-terminal amino acid sequence analysis. They bind to ZPGPs by a polysulphate recognition mechanism similar to that found for proacrosin-ZPGP interactions. The haemagglutination activity of boar seminal plasma is also associated with these low Mr glycoproteins. It is suggested that they play a role in regulating the rate of sperm capacitation and survival in the female reproductive tract. © 1992 Wiley-Liss, Inc.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrd.1080330115
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  • 10
    Electronic Resource
    Electronic Resource
    Intracellular signal transduction mechanisms of rat epididymal spermatozoa and their relationship to motility and metabolism (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Molecular Reproduction and Development 38 (1994), S. 77-84 
    Details
    ISSN: 1040-452X
    Keywords: Cauda epididymidis ; Sperm activation ; Calcium ions ; Guanylate cyclase ; Adenylate cyclase ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: The role of intracellular signal transduction mechanisms in regulating the motility and metabolism of rat spermatozoa in undiluted caudal epididymal fluid (CEF) was examined. Samples of CEF containing immotile spermatozoa were exposed to drugs and other agents that either stimulate signal transduction pathways or mimic the action of their second messengers. Under these conditions, sperm motility in 25-30 nl of CEF was stimulated by calcium ions (Ca2+), N,2′ -O-dibutyryl-guanosine 3′:5′ -cyclic monophosphate (dibutryl cGMP), cyclic adenosine 3′:5′-monophosphate (cAMP), N6,2′-O-dibutyryladenosine 3′:5′ -cyclic monophosphate (dibutyryl cAMP), 8-bromoadenosine 3′:5′ -cyclic monophosphate (8-bromo cAMP), caffeine, theophylline and bicarbonate ions (HCO3-). Other agents such as magnesium ions (Mg2+), veratridine, phospholipase C (PLC), ionophore A23187, 1,2-dioctenoyl-sn-glycerol (DAG), phorbol 12-myristate 13-acetate, phospholipase A2 (PLA2), arachidonic acid, and melittin did not significantly influence motility. In the presence of radiolabelled energy substrates, untreated (immotile) spermatozoa in samples of CEF utilised D-[U-14C]glucose and [1-14C]acetate as exogenous energy sources for oxidative metabolism. No detectable 14C-lactate was produced, and none of the drugs altered the rate of glycolytic or oxidative metabolism. The findings suggest that the motility of rat caudal epididymal spermatozoa is regulated by Ca2+ and the guanylate cyclase and adenylate cyclase pathways, but not through the PLC and PLA2 pathways. Also, their metabolism of exogenous substrate was uncoupled from the induction of motility, and their oxidative capacity exceeded the rate of flux of glucose-carbon through the glycolytic pathway. © 1994 Wiley-Liss, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrd.1080380113
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