Quantification of the daily cytokinin transport from the root to the shoot of Urtica dioica L. (Record no. 50350)
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| fixed length control field | 02652nam a2200241Ia 4500 |
| 003 - CONTROL NUMBER IDENTIFIER | |
| control field | MX-MdCICY |
| 005 - DATE AND TIME OF LATEST TRANSACTION | |
| control field | 20250625160146.0 |
| 040 ## - CATALOGING SOURCE | |
| Transcribing agency | CICY |
| 090 ## - LOCALLY ASSIGNED LC-TYPE CALL NUMBER (OCLC); LOCAL CALL NUMBER (RLIN) | |
| Classification number (OCLC) (R) ; Classification number, CALL (RLIN) (NR) | B-16176 |
| 008 - FIXED-LENGTH DATA ELEMENTS--GENERAL INFORMATION | |
| fixed length control field | 250602s9999 xx |||||s2 |||| ||und|d |
| 245 10 - TITLE STATEMENT | |
| Title | Quantification of the daily cytokinin transport from the root to the shoot of Urtica dioica L. |
| 490 0# - SERIES STATEMENT | |
| Volume/sequential designation | Botanica Acta, 107(5), p.342-348, 1994 |
| 520 3# - SUMMARY, ETC. | |
| Summary, etc. | Cytokinins are predominantly root-born phytohormones which are distributed in the shoot via the xylem stream. in the hormone message concept they are considered as root signals mediating the transport of the photosynthates to the various sinks of a plant. In this paper the cytokinin relations of Urtica dioica L., the stinging nettle, are described, based on the daily flux from the roots to the shoot. Trans-zeatin-type cytokinins predominate in the various tissues of Urtica (Wagner and Beck, 1993), and accordingly trans-zeatin riboside and trans-zeatin are the forms transported by the xylem sap. The daily time-course of cytokinin concentration in root pressure exudates and in xylem sap collected from a petiole after pressurizing the root bed showed high concentrations in the morning, followed by a substantial drop to a level of 15-30 per cent of the initial concentration which was then maintained during the afternoon. This time-course is interpreted as resulting from continuous synthesis and exudation of cytokinins into the xylem fluid of the roots whose cytokinin concentration is then modified by the dynamics of the transpiration stream. Loading of cytokinins into the xylem sap could be enhanced several times by increasing the flux rate of the xylem stream to the maximal transpiration rate when a maximum export rate was reached. The total daily cytokinin gain by the shoot depended on the nitrogen status of the plant. Roots of Urtica plants grown on a sufficient nitrogen supply had a significantly higher cytokinin content and exuded more cytokinins into the shoot tan those of plants raised under nitrogen shortage. A positive correlation was found between the steady rates of cytokinin export measured during the afternoon and the shoot to root-ratios of biomass which, in turn, corresponded to the nitrogen status of the plants. |
| 650 14 - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name entry element | URTICA DIOICA |
| 650 14 - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name entry element | CYTOKININ RELATIONS |
| 650 14 - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name entry element | NITROGEN SUPPLY |
| 650 14 - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name entry element | ROOT PRESSURE EXUDATE |
| 650 14 - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name entry element | XYLEM SAP |
| 700 12 - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Beck, E. |
| 700 12 - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Wagner, B.M. |
| 856 40 - ELECTRONIC LOCATION AND ACCESS | |
| Uniform Resource Identifier | <a href="https://drive.google.com/file/d/14lhbck-bQ0a5QMVcDLln_2eqWFv2M2up/view?usp=drivesdk">https://drive.google.com/file/d/14lhbck-bQ0a5QMVcDLln_2eqWFv2M2up/view?usp=drivesdk</a> |
| Public note | Para ver el documento ingresa a Google con tu cuenta: @cicy.edu.mx |
| 942 ## - ADDED ENTRY ELEMENTS (KOHA) | |
| Source of classification or shelving scheme | Clasificación local |
| Koha item type | Documentos solicitados |
| Lost status | Source of classification or shelving scheme | Damaged status | Not for loan | Collection | Home library | Current library | Shelving location | Date acquired | Total checkouts | Full call number | Date last seen | Price effective from | Koha item type |
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| Clasificación local | Ref1 | CICY | CICY | Documento préstamo interbibliotecario | 25.06.2025 | B-16176 | 25.06.2025 | 25.06.2025 | Documentos solicitados |