Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 421849
Title Use in plant breeding of acute, chronic or fractionated doses of X-rays or fast neutrons as illustrated with leaves of Saintpaulia
Author(s) Broertjes, C.
Source Landbouwhogeschool Wageningen. Promotor(en): J. Sneep. - Wageningen : Centre for Agricultural Publishing and Documentation - ISBN 9789022003893 - 74 p.
Department(s) Wageningen University
Publication type Dissertation, internally prepared
Publication year 1971
Keyword(s) gesneriaceae - mutaties - sierplanten - plantenveredeling - straling - mutations - ornamental plants - plant breeding - radiation
Categories Plant Breeding and Genetics (General) / Scrophulariales
Abstract <br/>The parameters used were survival of irradiated leaves of <em>S. ionantha</em> , production of adventitious plantlets at the base of the petiole and mutation frequency.<p/>The differences between unfiltered X-rays from a 250/25 deep therapy apparatus and fast neutrons from a degraded fissions spectrum was slight and sometimes negligible. A striking dose rate effect was observed, especially with X-rays. In fractionation experiments a protective mechanism was induced in the leaves by pre-irradiation with either type of radiation. This mechanism reached a maximum after 8-12 h. Then the extent of the protection was equivalent to 3 krad X-rays or 1.5 krad fast neutrons after a single pre-treatment with the optimum initial dose of 500 rad, X-rays or fast neutrons. A 10-15 fold irradiation with this dose, separated by 8-h intervals, induced a protection of 6-7 krad X-rays or 3-4 krad fast neutrons.<p/>Several of the treatments result in a higher number of mutants per 100 irradiated leaves compared with the optimum acute dose of 3 krad X-rays or 1.5 krad fast neutrons.
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