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  • 1
    Electronic Resource
    Electronic Resource
    Innovative propagation methods in seed tuber multiplication programmes (1997)
    Springer
    Potato research 40 (1997), S. 439-453 
    Details
    ISSN: 1871-4528
    Keywords: vitroplantlets ; microtubers ; minitubers ; genetic stability ; storage and physiological age ; field performance ; seed production programmes ; Solanum tuberosum L.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The production of large volumes of vitroplantlets and greenhouse tubers for increasing the rate of multiplication at the start of seed programmes provides the opportunity of reducing the total number of field generations grown before the seed moves into commerce. This implementation is especially useful for countries where high quality potato seed tubers cannot be produced because there are no vector-free production areas. This review covers the following steps: a) laboratory production of microplantlets and microtubers; b) minituber production in the glasshouse; c) storage and dormancy of micro- and minitubers; d) field performance of micro- and minitubers compared with conventional seed tubers; e) incorporation of the mentioned propagules in seed production systems. Many optimized protocols are already available for propagating plantlets, inducing microtubers and obtaining minitubers in the glasshouse at all periods of the year. Advanced molecular approaches techniques (RFLP and RAPD) to detect genetic variation in the progeny of these propagules have been described. Investigations carried out in this field have shown genetic stability, with the propagules usually reproducing plants true-to-type and tubers without deviants. By contrast, variations were demonstrated in DNA extracted from old suspension cell culture. Field trials assessed a lower yield potential crops from in vitro propagules compared with conventional seed tubers., mainly due to slow early crop development and the failure of plants caused by early stress after emergence. This may cause problems when the growing season is short because of the necessity for planting late to avoid night frosts and the mandatory haulm killing dates, common in many seed producing areas. Strategies for improving the field performance of micro- and minitubers are discussed. The most promising crop husbandry techniques appear to be: a) using tubers of a suitable physiological age, properly presprouted and encapsulated; b) optimizing the time application of fertilizer and irrigation, and c) using floating films. Outside the classical seed tuber areas of Northern Europe where the length of the growing period for pre-basic seed is usually not more than 80 days, the growing season is long enough to obtain reasonable yields even from micro- and minitubers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358004
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  • 2
    Electronic Resource
    Electronic Resource
    The effects of (S)-(+)-carvone treatments on seed potato tuber dormancy and sprouting (1997)
    Springer
    Potato research 40 (1997), S. 155-161 
    Details
    ISSN: 1871-4528
    Keywords: concentration ; gas chromatography ; sprout suppression ; storage ; Solanum tuberosum L
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Potato seed tubers may suffer from premature sprouting during storage, thus limiting their suitability for cultivation. Commonly used sprout suppressant treatments negatively affect but viability and therefore a reliable method to inhibit bud development must still be found for seed tubers. The monoterpene carvone ((S)-(+)-carvone) was tested in small scale experiments. The vapour of this compound fully inhibited bud growth of tubers cv. Monalisa stored at 23°C without affecting bud viability throughout 6 months of treatment. The most effective range of carvone vapour concentrations was between 0.34 and 1.06 μmol mol−1. With these qualities we can expect carvone to become a suitable sprout suppressant for seed tubers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358241
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  • 3
    Electronic Resource
    Electronic Resource
    Phenotypic recurrent selection in common bean (Phaseolus vulgaris L.) based on performance of S2 progenies (1996)
    Springer
    Euphytica 87 (1996), S. 127-132 
    Details
    ISSN: 1573-5060
    Keywords: Common bean ; grain yield improvement ; Phaseolus vulgaris ; recurrent selection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The effect of a recurrent selection procedure for improving seed yield per plant was evaluated in common bean. Progress was registered after three cycles of recurrent selection with S2 progeny evaluation performed on the grain yield/plant. Gain from selection was estimated by field testing 45 random S2 lines from each of the C0, C1 and C2 populations. Response to selection for seed yield/plant was 6 g from C0 to C1 and 4.4 g from C1 to C2. The seed yield improvement was due principally to an increase in pods/plant; little contribution was provided by the 1000-seed weight and seeds/pod traits. Broad-sense heritability and genotypic variance for grain yield remained high in all cycles which suggests further gain from additional selection cycles. Grain yield/plant is significantly correlated to pods/plant and seeds/pod traits in all cycles, indicating that plants with favourable combinations of these traits could be identified. The proposed recurrent selection procedure appears to be effective in improving the population and extracting superior genotypes for varietal development.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00021885
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  • 4
    Electronic Resource
    Electronic Resource
    Response to selection for seed yield in bean (Phaseolus vulgaris) (1991)
    Springer
    Euphytica 57 (1991), S. 117-123 
    Details
    ISSN: 1573-5060
    Keywords: Phaseolus vulgaris ; common bean ; F1 diversity ; factor analysis ; selection index ; breeding ; seed yield
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A breeding program aimed at improving the seed yield in bean for processing was started. Six parents divergent in a range of agronomical characters were crossed according to diallel mating design. Cluster analysis performed on the composite cross population evidenced divergence between F1 hybrids and to maximize genetic recombination, the most different F1 hybrids were intercrossed. A Factor analysis was performed on 7 morphological and yield-determining traits of 15 hybrids F1 and parents. Three Factors, representing patterns of variables interpreted as productivity per plant, growth factor, and branching-productivity, were extracted. These results evidenced the inverse relationship between seed yield components (seeds/pod, pods/plant, and hundred seed weight): i.e. the selection for either variable is detrimental to the other. It may be possible to break this association if the plant construct assures high sink to satisfy all plant requirements: tall and large plants bearing numerous nodes, leaves and reproductive structures. Moreover, the selection practiced simultaneously on the yield components positively affected the seed yield trait. An index of selection and response to selection were estimated on the segregant populations. The realized gain in seed/yield reached after one cycle of selection (C1) was 6.5 g, about 20% over the base population (C0). The expected gain from selection based on the superior 5% plants in C2 families was 25.5% and approached the realized gain. The result of this paper gives evidence to support that the seed yield can be improved by an adequate selection intensity and selection index can be very useful when it is faced with the improvement of several traits at the same time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00023069
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  • 5
    Electronic Resource
    Electronic Resource
    Effects of γ-ray treatment onCannabis saliva pollen viability (1997)
    Springer
    Plant cell, tissue and organ culture 47 (1997), S. 189-194 
    Details
    ISSN: 1573-5044
    Keywords: hemp ; in vitro germination ; irradiation ; mutagenesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The viability and thein vitro germination capability of hemp pollen (cv. Carmagnola) were studied. Viability tests were based on the microscopic observation of the fluorescence of loaded fluorescein diacetate (FDA), while, for germinability tests, five different media were tested. The effects of irradiation with γ-rays on pollen viability and germination and on seed set were also studied, at three different irradiation doses (20, 60 and 100krad). The results show that in one of the media tested, about 85–90% of the pollen grains are viable and able to germinate in control samples, and that while viability measured by FDA test is not affected by increased γ-ray doses, the pollenin vitro germinability drops to about one-half of the controls at the maximum γ-ray dose employed, 100krad. Seed set of hemp plants pollinated with the irradiated pollen dropped to less than 1% of that of plants pollinated by untreated pollen for the higher dose used. The different media suitable forin vitro germination of hemp pollen, and the observed lack of correspondence between viability and germination capacity tests are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02318957
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  • 6
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    Comparison of Hemp Varieties Using Random Amplified Polymorphic DNA Markers (2001)
    Wiley
    Details
    Publication Date: 2001-11-01
    Print ISSN: 0011-183X
    Electronic ISSN: 1435-0653
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Wiley
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  • 7
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    Heterologous microarray experiments allow the identification of the early events associated with potato tuber cold sweetening (2008)
    BioMed Central
    Details
    Publication Date: 2008-01-01
    Electronic ISSN: 1471-2164
    Topics: Biology
    Published by BioMed Central
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