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 525639
Title Nodulation of leguminous plants as affected by root secretions and red light
Author(s) Lie, T.A.
Source University. Promotor(en): E.G. Mulder. - Wageningen : Veenman - 89
Publication type Dissertation, internally prepared
Publication year 1964
Keyword(s) fabaceae - phaseolus vulgaris - stikstofbindende bacteriën - symbiose - rhizobium - wortelknolletjes - knobbelvorming - peulvruchten - groei - plantenontwikkeling - plantkunde - nitrogen fixing bacteria - symbiosis - root nodules - nodulation - grain legumes - growth - plant development - botany
Categories Fabales
Abstract Nodulation of bean plants, Phaseolus vulgaris L., in water culture was poor during hot sunny weather in the greenhouse. It did not improve when indoleacetic acid, kinetin, gibberellic acid, purines and pyrimidines, yeast and soil extract were added. Nodulation was enhanced by adding used culture solution of nodulated pea or bean plants or an extract of root nodules. The active substance was soluble in water and ether and was inactivated by heating at 80°C. During purification it was observed that the active fractions strongly absorbed ultraviolet light at about 260 mμ.

Light quality also influenced nodulation of plants grown in light cabinets: nodulation was good in red and poor in blue light. If the shoot was radiated with far- red light (about 730 mμ) for a few minutes at the end of the photoperiod, there were fewer nodules and this effect could be counteracted by subsequent radiation with red light (about 660 mμ). These results suggested that nodulation was controlled by the phytochrome system.

The hypothesis was put forward that a kinetin-like substance was involved in the formation of root-nodules.

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