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 525550
Title Heksenbezemverschijnselen : een pathologisch-morfologisch onderzoek
Author(s) Bos, L.
Source Wageningen University. Promotor(en): H.J. Venema; T.H. Thung. - Wageningen : Veenman - 79
Department(s) Laboratory of Virology
Publication type Dissertation, internally prepared
Publication year 1957
Keyword(s) heksenbezems - plantenziekten - plantenvirussen - witches' brooms - plant diseases - plant viruses
Categories Plant Viruses
Abstract Infectious forms of witch's broom caused by a virus, were observed in Crotalaria spp. and other leguminous crops in Indonesia, and in Rubus idaeus and some herbaceous ornamentals, mainly Trqpaeolum majus, in the Netherlands. A detailed analysis of the abnormalities in Crotalaria and Tropaeolum was given. A plant infected during its early stages of development became a bushy dwarf. All potential buds developed into negatively geotropic sprouts and no flowers formed. A plant infected late had an almost normal growth habit, but inflorescences grew into complex leafy structures, thus producing broomy branch extremities. The younger their buds at the moment of infection, the more abnormal were the flowers. Thus a series of progressive floral abnormalities from a normal flower up to a completely vegetative leafy branch could be selected. The series of deviations was called antholysis. These abnormalities supported the theory that morphologically the flower must be regarded as a modified leafy branch.
Large-scale virus-induced antholysis demonstrated the morphogenetic antagonism between floral initiation and vegetative growth. Many similar virus diseases were brought together in a group of witch's broom virus diseases. Other factors may cause related aberrations: certain parasitic plants, fungi, bacteria, mites and insects. However, they only incited restricted symptoms of witch's broom. The morphological analysis of witch's broom phenomena provided arguments that growth-hormonal disturbances were involved.
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