ISSN:
1573-5036
Keywords:
field bean
;
nodulation
;
N2 fixation
;
nitrate
;
Phaseolus spp.
;
Rhizobium phaseoli
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Abstract Common bean,Phaseolus vulgaris L., is known to be ‘inefficient’ in nodulation and N2 fixation although it responds to applied nitrogen. An experiment was conducted to identify and to characterize bean cultivars nodulating in the presence of a high level of nitrogen. Sixteen cultivars and a check for inefficient nodulation, OAC Seaforth, were inoculated and grown for 40 days in replicated pots supplied with zero, 3.5 and 10.5 mM combined nitrogen as NO 3 − and NH 4 + . Seven traits relating to nodulation and N2 fixation were all significantly affected by N level (N), cultivar (Cv) and N × Cv interactions (except for root dry weight), indicating that cultivars responded differently to the N treatments. Total dry weight (W) and shoot to root ratio (S/R) increased with the increased N levels. Nodule dry weight (Wn), visual nodulation score (Nv) and nodulation index (Nx) decreased as the N increased. Percent N and N content per plant increased with the increased N level. Plant weight (W) was positively correlated with Wn, Nv and N content and negatively correlated with %N. Nodulation score was positively associated with Wn and plant N content. Genotypes superior in nodulation and N2 fixation in the presence of N were identified. Cultivars Italian Barlotti, California Light Red Kidney, Kentucky Wonder A and Pueblo 152 were selected for further testing and use in improving the nitrate tolerant nodulating characteristic of bean.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02370414
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