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
    The cellular pathway of sucrose transport in developing cotyledons of Vicia faba L. and Phaseolus vulgaris L.: a physiological assessment (1995)
    Springer
    Planta 196 (1995), S. 659-667 
    Details
    ISSN: 1432-2048
    Keywords: Cotyledon (developing) ; Dermal cell complex (Phaseolus) ; Dermal transfer cell complex (Vicia) ; Phaseolus ; Sugar transport ; Vicia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The cellular pathway of sugar uptake in developing cotyledons of Vicia faba L. and Phaseolus vulgaris L. seed was evaluated using a physiological approach. The cotyledon interface with the seed coat is characterised by a specialised dermal cell complex. In the case of Vicia faba cotyledons, the epidermal component of the dermal cell complex is composed of transfer cells. Sucrose is the major sugar presented to the outer surface of both cotyledons and it is taken up from the apoplasm unaltered. Estimated sucrose concentrations within the apparent free space of Vicia and Phaseolus cotyledons were 105 and 113 mM respectively. Rates of in-vitro uptake of [14C]sucrose by cotyledon segments or by whole cotyledons following physical removal or porter inactivation of the outer cells demonstrated that, for both Vicia and Phaseolus cotyledons, the dermal cell complexes are the most intense sites of sucrose uptake. Accumulation of [14C]sucrose in the storage parenchyma of whole cotyledons was directly affected by experimental manipulation of uptake by the outer cell layers and plasmolytic disruption of the interconnecting plasmodesmata. These findings indicated that sucrose accumulated by the dermal cell complexes is transported symplasmically to the storage parenchyma. Overall, it is concluded that the dermal cell complexes of the developing legume embryo, irrespective of the presence or absence of wall ingrowths, are the major sites for the uptake of sucrose released from the maternal tissues to the seed apoplasm. Thereafter, the accumulated sucrose is transported radially inward through the symplast to the storage parenchyma.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00197329
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Kinetin-promoted transport of assimilates in stems of Phaseolus vulgaris L. (1979)
    Springer
    Planta 147 (1979), S. 151-155 
    Details
    ISSN: 1432-2048
    Keywords: Assimilates ; Cytokinin ; Phaseolus ; Photosynthates (transport) ; Transport (photosynthates)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Kinetin, applied as a dispersion in aqueous lanolin to the stumps of decapitated stems of P. vulgaris plants with their roots removed, was found to promote the transport of 14C- and 32P-labelled assimilates to the site of hormone application. Measurement of photosynthetic rate of, and assimilate export rate from the source leaves, indicated that kinetin was not acting to promote assimilate transport by stimulating these processes. Moreover, it was found that the time between kinetin application and detection of an enhanced transport flux was independent of the distance over which kinetin would need to move to be present throughout the length of the transport pathway. These observations, together with the finding that lateral applications of kinetin to the stems resulted in an enhanced localized accumulation of assimilates, provided evidence that kinetin acted locally at its point of application to stimulate assimilate transfer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00389516
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Gibberellic-acid-promoted transport of assimilates in stems of Phaseolus vulgaris L. (1979)
    Springer
    Planta 145 (1979), S. 233-238 
    Details
    ISSN: 1432-2048
    Keywords: Assimilates ; Gibberellin ; Phaseolus ; Photosynthesis products (transport) ; Transport (assimilates)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Gibberellic acid (GA3), applied as a dispersion in aqueous lanolin to the stumps of decapitated stems of P. vulgaris plants, was found to promote the transfer of 14C-and 32P-labelled assimilates to the site of hormone application. Measurements of the component transfer processes, operating between source and sink (site of hormone application), showed that GA3 was not acting to promote assimilate transfer by increasing the photosynthetic rate of, or the assimilate export rate from the source, nor by altering the mobilizing ability of the competing root sink. Here, it also was found that the time between GA3 application and detection of an enhanced transport flux was independent of the length of the transport pathway. Overall, the evidence obtained indicated that GA3 was not acting on any transfer process remote from its point of hormone application but was acting locally at this latter point.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00454446
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    The cellular pathway of sucrose transport in developing cotyledons ofVicia faba L. andPhaseolus vulgaris L.: a physiological assessment (1995)
    Springer
    Planta 196 (1995), S. 659-667 
    Details
    ISSN: 1432-2048
    Keywords: Cotyledon (developing) ; Dermal cell complex (Phaseolus) ; Dermal transfer cell complex (Vicia) ; Phaseolus ; Sugar transport ; Vicia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The cellular pathway of sugar uptake in developing cotyledons ofVicia faba L. andPhaseolus vulgaris L. seed was evaluated using a physiological approach. The cotyledon interface with the seed coat is characterised by a specialised dermal cell complex. In the case ofVicia faba cotyledons, the epidermal component of the dermal cell complex is composed of transfer cells. Sucrose is the major sugar presented to the outer surface of both cotyledons and it is taken up from the apoplasm unaltered. Estimated sucrose concentrations within the apparent free space ofVicia andPhaseolus cotyledons were 105 and 113 mM respectively. Rates of in-vitro uptake of [14C]sucrose by cotyledon segments or by whole cotyledons following physical removal or porter inactivation of the outer cells demonstrated that, for bothVicia andPhaseolus cotyledons, the dermal cell complexes are the most intense sites of sucrose uptake. Accumulation of [14C]sucrose in the storage parenchyma of whole cotyledons was directly affected by experimental manipulation of uptake by the outer cell layers and plasmolytic disruption of the interconnecting plasmodesmata. These findings indicated that sucrose accumulated by the dermal cell complexes is transported symplasmically to the storage parenchyma. Overall, it is concluded that the dermal cell complexes of the developing legume embryo, irrespective of the presence or absence of wall ingrowths, are the major sites for the uptake of sucrose released from the maternal tissues to the seed apoplasm. Thereafter, the accumulated sucrose is transported radially inward through the symplast to the storage parenchyma.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01106758
    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...