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  • potato  (3)
  • Lymnaea stagnalis  (2)
  • size grade  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Molecular cloning of G protein α subunits from the central nervous system of the mollusc Lymnaea stagnalis
    Amsterdam : Elsevier
    FEBS Letters 314 (1992), S. 215-219 
    Details
    ISSN: 0014-5793
    Keywords: Central nervous system ; G protein α subunit ; Lymnaea stagnalis ; cDNA cloning
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0014-5793(92)81474-Z
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  • 2
    Electronic Resource
    Electronic Resource
    Localization of ovulation hormone-like neuropeptide in the central nervous system of the snail Lymnaea stagnalis by means of immunocytochemistry and in situ hybridization (1988)
    Springer
    Cell & tissue research 251 (1988), S. 477-484 
    Details
    ISSN: 1432-0878
    Keywords: Caudo-dorsal cells ; Neuropeptides ; Immunocytochemistry ; In situ hybridization ; Ovulation hormone ; Lymnaea stagnalis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The caudo-dorsal cells (CDC) in the cerebral ganglia of the pond snail Lymnaea stagnalis synthesize the 36-amino acid ovulation hormone (CDCH). We have used immuno-cytochemistry and in situ hybridization to reveal the localization of neurons and axons containing CDCH-like material. A monoclonal antibody to a fragment of CDCH and a cDNA probe encoding CDCH reacted with the CDC-system, with specific cell groups in the cerebral and pleural ganglia, and with individually occurring neurons throughout the central nervous system. The cells in the pleural ganglia, which were found in about 50% of the preparations studied, are considered as “ectopic” CDC. They are morphologically similar to CDC in their somal dimensions and axonal organization. By means of immuno-electron microscopy it was shown that these neurons contain secretory vesicles that are similar to those of the CDC. The neurons of the bilateral groups occurring in the cerebral ganglia in addition to the CDC are smaller and more intensely stained than the CDC. Axons of these small neurons probably have varicosities located on the CDC axons in the neuropil of the cerebral ganglion, indicating synaptic contacts. Two major axon tracts could be followed from (or toward) the neuropil of the cerebral ganglion. One tract runs from the cerebral gangion via the pleural and parietal ganglia to the visceral ganglion, giving off branches to most nerves emanating from these ganglia. The other tract could be traced through the cerebro-pedal connective to the pedal ganglia. Only in the right pedal ganglion was extensive axonal branching observed. The nerves emanating from this ganglion contained many more immunoreactive axons than those from the left pedal ganglion. A polyclonal antibody raised against the synthetic fragment of CDCH stained, in addition to the neurons and axons revealed with the monoclonal antibody and the cDNA probe, three other major groups of neurons. Two are located in the cerebral ganglion, the other in the left pedal ganglion. The present findings suggest the presence of a system of neurons that contain CDCH or CDCH-like peptides. The role this system may play in the control of egg-laying and egg-laying behaviour is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00215857
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  • 3
    Electronic Resource
    Electronic Resource
    Manipulation of tuber-size distribution of a potato crop (1990)
    Springer
    Potato research 33 (1990), S. 417-432 
    Details
    ISSN: 1871-4528
    Keywords: stolonization ; tuberization ; tuber bulking ; size grade ; stem number ; Solanum tuberosum L.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Tuber-size distribution is regulated by many diverse, interacting mechanisms and is therefore difficult to understand and manipulate. It is determined by plant density, number of stems per plant, number of tubers per stem, and yield. Seed size and plant number per unit area are easy to control, but stem number is affected by less controllable factors. Interactions between stems of different types are important for tuber-size distribution. The hormonal regulation of stolonization and tuberization is still unknown, but under the conditions of north-west Europe the process of tuber set (which is also poorly understood) makes a greater contribution to the final number of tubers than tuberization. The total yield is also relevant, because it affects both the average tuber size and its variation. Tubers on the same stem differ in timing, rate and duration of growth. The resulting hierarchy in sink strength is not consistent over time. Several mechanisms are suggested for this hierarchy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358019
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  • 4
    Electronic Resource
    Electronic Resource
    Possible mechanisms of size hierarchy among tubers on one stem of a potato (Solanum tuberosum L.) plant (1991)
    Springer
    Potato research 34 (1991), S. 187-203 
    Details
    ISSN: 1871-4528
    Keywords: size grade ; tuberization ; tuber bulking ; tuber-size distribution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The tubers on one potato stem vary greatly in size and their size distribution may be described by their number and their average size and its variation. These components are mutually and closely related. The variation is partly caused by stolon characteristics, including their date of initiation, position and size. Tuber size is therefore partly determined before tuberization. Tuber-specific factors, such as the position and activity of the tuber initial also play a role, but the date of initiation of an individual tuber is not crucial. Later on, during tuber bulking, the activity of enzymes involved in starch metabolism, the levels of hormones, the mineral composition and the turgor potential are associated with the tuber growth rate. The growth characteristics of individual tubers may also vary since they are exposed to different conditions because of differences in position or growing period.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358041
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  • 5
    Electronic Resource
    Electronic Resource
    Similarity of QTLs detected for in vitro and greenhouse development of potato plants (1999)
    Springer
    Molecular breeding 5 (1999), S. 417-428 
    Details
    ISSN: 1572-9788
    Keywords: QTLs ; tuberization earliness ; in vitro conditions ; sugars in leaf exudate ; marker-assisted selection ; potato
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract A relationship between quantitative trait loci (QTLs) detected for in vitro and greenhouse growing conditions was studied in a backcross population of 155 genotypes derived from a haploid potato (Solanum tuberosum) and a diploid wild species (S. berthaultii). Both plant height and tuberization earliness were characterized under two growing conditions. Main-effect QTLs and QTLs identified only through interaction were detected for each of the traits. For traits associated with plant height as well as for traits associated with early tuberization, the most significant QTL detected for greenhouse cultivated plants was also found when the population was grown in vitro. The most significant QTL for earliness of tuberization in vitro, which was located on chromosome 8, coincides with that detected for sucrose concentration in leaf exudate. The absence of a S. berthaultii allele was associated both with a higher amount of sucrose in the exudate and with earlier in vitro tuber formation. Epistasis was found to have a significant effect on all traits investigated. The QTL model that included main-effect QTLs and all significant interactions explained 83–88% of the total genetic variance for each of the developmental traits. The possibility of using an in vitro system combined with marker-assisted selection for preliminary selection of early tuberizing clones is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009686220862
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  • 6
    Electronic Resource
    Electronic Resource
    Genetics of self-compatibility in dihaploids of Solanum tuberosum L. 5. The S-genotype of tetraploid potato cultivar gineke (1978)
    Springer
    Euphytica 27 (1978), S. 385-388 
    Details
    ISSN: 1573-5060
    Keywords: Solanum tuberosum ; potato ; incompatibility ; dihaploid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Investigations of the genetics of self-compatibility and self-incompatibility in dihaploids and diploid derivatives from cv. Gineke revealed the presence of S 1, S2 and S 3 at the S-locus of Gineke and in addition an S 1-allele on a translocation. By means of a complete tester set involving the S-alleles S 1, S2 and S 3 (all from Gineke) and S 4 (from Black 4495) it was demonstrated that some Gineke dihaploids were compatible with all six testers. This indicated a fourth S-allele in Gineke, which differs from those in the tester series and was therefore assigned S 5. Additional evidence was obtained from an analysis of F1's from crosses of two S 5-bearing dihaploids and one of the testers. So the S-genotype of cv. Gineke was identified as S 1S2S3S5/S1, the second S 1 being the S-allele on a translocated fragment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00043163
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  • 7
    Electronic Resource
    Electronic Resource
    Use of the growth retardant tetcyclacis for potato tuber formation in vitro (1994)
    Springer
    Plant growth regulation 14 (1994), S. 257-265 
    Details
    ISSN: 1573-5087
    Keywords: growth retardant ; in vitro culture ; potato ; tetcyclacis ; tuber formation ; tuber-specific genes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The effects of the plant growth retardant tetcyclacis on in vitro tuber formation in potatoes was studied, using two different approaches: 1. tuber formation in various lines that did not or hardly form tubers under control conditions, and 2. tuber formation by the variety Bintje, which readily forms tubers. The ABA-deficient (droopy) lines of S. phureja hardly formed tubers without the addition of tetcyclacis. In the presence of this growth retardant tuberization was nearly 100%, within three weeks of in vitro culture, even in the absence of cytokinin. A series of somatic hybrids between S. tuberosum and S. brevidens, that did not form tubers in field and pot experiments, were tested. They all formed tubers in vitro in the presence of tetcyclacis. Stoloniferous shoots formed on single-node cuttings from in vitro grown Solanum tuberosum var Bintje plantlets were transferred to media containing a high level of sucrose. In the presence of tetcyclacis, tuber formation started after 4 days, reaching a maximum level of 80% at day 7. Tubers formed in the presence of tetcyclacis, accumulated starch and expressed several tuber-specific genes. These effects were fully antagonized by gibberellic acid. It is concluded that the growth retardant tetcyclacis is a potent tool in the study of tuber formation in potatoes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00024801
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