Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Tolerance to low temperatures and tuber soft rot in hybrids between Solanum commersonii and Solanum tuberosum obtained through manipulation of ploidy and endosperm balance number (EBN) (2000)
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 119 (2000), 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 to evaluate the tolerance to low temperatures and tuber soft rot in hybrids between Solanum commersonii and Solanum tuberosum. The experimental materials consisted of F1 triploid, BC1 pentaploid-near pentaploid and BC2 tetraploid–near tetraploid hybrids. The F1 triploids had a freezing tolerance and acclimatization capacity closest to S. commersonii. This indicated that the endosperm barriers which prevent the introgression of 1EBN S. commersonii into 4EBN S. tuberosum had been overcome. Indeed, the triploids produced 2n eggs, thus giving a compatible maternal to paternal EBN ratio in the hybrid endosperm generated by the 3x(2EBN) × 4x(3EBN) crosses. The tolerance to low temperatures of BC1 and BC2 hybrids was lower than that of the F1. However, a number of genotypes were identified which were able to withstand temperatures down to -5°C. Some BC2 hybrids were also tested for their tolerance to tuber soft rot, and some resistant hybrids were detected. A number of them combined the capacity for cold acclimatization with tolerance to tuber soft rot. These hybrids have an EBN of 4; they are fertile and have been used in backcrosses with 4EBN S. tuberosum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1439-0523.2000.00477.x
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Plasmolytic behavior of the donor cell may affect protoplast response (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 76 (1989), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Protoplast donor tissues (leaves of shoots in culture) from a herbaceous plant (Solanum etuberosum) and two woody species (Populus alba × P. grandidentata cv. Crandon and Betula platyphylla szechuanica) were compared during plasmolysis in a range of osmotic agents and potentials. Cells from both Solanum and Populus, species proven to be amenable to protoplast division and regeneration, plasmolyzed readily at higher osmotic potentials than cells from Betula, a species recalcitrant to prolonged culture after protoplast isolation. Betula leaf mesophyll cells exhibited persistent membrane-to-wall attachments and many failed to plasmolyze even under extreme osmolarity. Although their leaves exhibited similar photosynthetic rates, photosynthetic capacity was lost from Betula protoplasts upon isolation, and retained by Solanum protoplasts. Differential stress after isolation was not detectable through vital staining, but only Solanum and Populus gave both high protoplast yields and high plating efficiencies in continued culture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1989.tb05632.x
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Dehydration of Onion Cells: A Comparison of Freezing vs. Desiccation and Living vs. Dead Cells (1977)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 41 (1977), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Measurements were made of the amount of liquid water present in the epidermal cells of onion at various degrees of dehydration caused by slow extracellular freezing and by desiccation. This was achieved by using a pulsed NMR spectrometer during freezing stress and by weighing the epidermal pieces during desiccation. Measurements were made on the extent of cell survival by direct microscopic observation (plasmolysis and protoplasmic streaming).Onion epidermal cells (Allium cepa L. cv. Downing Yellow Globe) were found to survive freezing temperatures as low as –20°C and an equivalent desiccation stress. This equivalence opposes the reports by others on Hordeum vulgare and on Solanum sp. of greater injury by freezing than by an equivalent dehydration due to desiccation. The discrepancy -has been explained in terms of the limitations of the conductivity method used by those authors to evaluate the injury.The freezing and desiccation curves correspond to the equation: L t=L0Δtm/t+Luwhere Lt and L0 are the amounts of liquid water at temperature t and O°C respectively. Δtm is the freezing point depression of the cell sap and Lu is the amount of liquid water which does not freeze.These results demonstrate that the dehydration of onion cells during both freezing and desiccation duplicates the dehydration of ordinary aqueous solutions. This was equally true for living and dead cells, and suggests that the negative turgor invoked by others is not significantly involved in the dehydration of living Allium cepa epidermis cells. An explanation is proposed for these contradictory results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1977.tb04883.x
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Effect of turgor pressure on water permeability ofAllium cepa epidermis cell membranes (1977)
    Springer
    The journal of membrane biology 33 (1977), S. 231-247 
    Details
    ISSN: 1432-1424
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Summary Using onion epidermis layer a very accurate method for measuring the permeability of epidermis cells to water was standardized. In this method a 1.4 cm diameter epidermis disc was soaked in tritiated water (500 μ Ci/ml) for about 1 hr. Next the disc was mounted in a specially designed elution chamber where it was held flat and washed on the noncuticular side with ordinary water. A constant flow rate, high enough to minimize unstirred layer effect, was used. Permeability was calculated in the usual way after separating different exponentials from the efflux curve of tritiated water. Turgor pressure of the cell was regulated by soaking the disc in mannitol solutions containing tritiated water and washing it in the chamber with same concentration mannitol solution containing no radioactivity. Water permeability values were found to decrease less than 8% when the turgor pressure was decreased from 8 atm (full turgor) to zero. Turgor pressure had no significant effect on the water permeability of onion epidermal cells. Our results are contradictory to the findings of Zimmerman and Steudle (1974,J. Membrane Biol. 16:331) but are similar to the findings of Tazawa and Kamiya (1966,Aust. J. Biol. Sci. 19:339) and Kiyosawa and Tazawa (1972,Protoplasma 74:257).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01869518
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Comments on: Effect of turgor pressure on water permeability ofAllium cepa epidermis cell membranes (1978)
    Springer
    The journal of membrane biology 41 (1978), S. 87-91 
    Details
    ISSN: 1432-1424
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01873341
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Freezing tolerance and tuber production in selfed and backcross progenies derived from somatic hybrids between Solanum tuberosum L. and S. commersonii Dun. (1999)
    Springer
    Theoretical and applied genetics 99 (1999), S. 100-107 
    Details
    ISSN: 1432-2242
    Keywords: Key words Potato ; Solanum tuberosum ; Freezing tolerance ; Cold acclimation ; Tuber traits
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Selfed and backcross progenies developed from tetraploid somatic hybrids between Solanum tuberosum (tbr) and S. commersonii (cmm) were characterized for nonacclimated freezing tolerance (NA) and acclimation capacity (ACC) (two independent genetic components of freezing tolerance) under controlled environments. The segregation covered 28% and 71% of the parental range for NA and ACC, respectively, with the distribution skewed toward the tbr parent. Therefore, ACC appeared to be relatively easier to recover in the segregating generation. Some first backcross progeny had greater freezing tolerance than the cultivated parent primarily through the increase in ACC. When grown in the field, the improved freezing tolerance observed in the selfed progeny under controlled conditions was confirmed. Among NA, ACC, and freezing tolerance after acclimation (AA, which is the cumulative performance of NA and ACC), AA exhibited the highest correlation coefficient with field frost tolerance. In addition to freezing tolerance, vine maturity and tuber traits including tuber yield, tuber number per plant, mean tuber weight, and specific gravity were also segregating. No significant correlation between undesirable tuber traits and freezing tolerance was detected. Vine maturity and freezing tolerance were significantly correlated, so more careful selection for earliness was necessary in incorporating freezing tolerance. Yield comparable or superior to the backcross parent Wis AG 231 and an early Canadian cultivar, ‘Sable’, was found in many backcross progeny and some selfed progeny. The observed high yield can be attributed to the increase in mean tuber weight as well as tuber number. Moreover, a high portion of progeny had a specific gravity higher than 1.085, and some greater than 1.1. The implications derived from this study in breeding for freezing tolerance and further use of these materials are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220051213
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Expression of freezing tolerance in the interspecific F1 and somatic hybrids of potatoes (1999)
    Springer
    Theoretical and applied genetics 98 (1999), S. 995-1004 
    Details
    ISSN: 1432-2242
    Keywords: Key words Freezing tolerance ; Potato ; Interspecific F1 ; Somatic hybrids ; Genomic ratio
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  The expression of freezing tolerance was examined in interspecific F1 and somatic hybrids of potatoes using 20 species and 34 different combinations between hardy and sensitive species. In the field, the frost tolerance of hybrids resembled either that of the hardy parent, the sensitive parent, or the parental mean, depending on the species combination and the genomic ratio (ratio of the number of sets of chromosomes contributed from each parent). Similar phenomena were observed when the non-acclimated freezing tolerance (NA) and the acclimation capacity (ACC) (two independent genetic components of freezing tolerance) were evaluated separately under controlled environments. In general, the expression level of freezing tolerance was higher in hybrids with more genomes contributed from the hardy parent than from the sensitive parent. In addition, the effectiveness or combining ability of genes conferring freezing tolerance from the hardy species also showed some influence on the expression of freezing tolerance. All three parameters, namely NA, ACC and acclimated freezing tolerance (AA) (NA plus ACC), were significantly correlated to the frost tolerance exhibited in the field. This indicates that the controlled freezing test used in this study could provide a good estimate of field performance. The implications of these results in breeding for freezing tolerance in potatoes are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220051160
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Genetic analysis and mapping of genes controlling freezing tolerance in oilseedBrassica (1995)
    Springer
    Molecular breeding 1 (1995), S. 329-339 
    Details
    ISSN: 1572-9788
    Keywords: Arabidopsis ; Brassica ; cold-induced ; freezing tolerance ; quantitative trait loci (QTL) ; restriction fragment length polymorphism (RFLP)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Freezing tolerance is the ability of plants to survive subfreezing temperatures and is a major component of winter survival. In order to study the genetic regulation of freezing tolerance, an F2 population ofBrassica rapa and a doubled haploid population ofBrassica napus were assayedin vitro for relative freezing tolerance of acclimated and nonacclimated plants. Linkage maps developed previously were used to identify putative quantitative trait loci (QTL). Genomic regions with significant effects on freezing tolerance were not found for theB. napus population, but forB. rapa four regions were associated with acclimated freezing tolerance (FTA) and acclimation ability (FTB), and two unliked regions were associated with nonacclimated freezing tolerance (FTN). Acclimation ability was regulated by genes with very small additive effects and both positive and negative dominance effects. The allele from the winter parent at the FTN QTL had positive additive effects, but negative dominance effects. RFLP loci detected by a cold-induced and a stress-related cDNA fromArabidopsis thaliana mapped near two QTL for FTA/FTB. Further tests are needed to determine if alleles at these loci are responsible for the QTL effects we detected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01248410
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...