HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Chaverra, M. H. Articles by Graham, P. H. Search for Related Content PubMed Articles by Chaverra, M. H. Articles by Graham, P. H. Agricola Articles by Chaverra, M. H. Articles by Graham, P. H.

Cultivar Variation in Traits Affecting Early Nodulation of Common Bean

Rhizobium Res. Lab., Dep. of Soil Science, Univ. of Minnesota, St. Paul, MN 55108.

^* Corresponding author.

Phaseolus vulgaris L. is inferior to other grain legumes in nodulation and N₂ fixation, with early-flowering cultivars particularly limited in the ability to satisfy their N needs through fixation. Extending the period of fixation could reduce the dependence of this crop on N-fertilization. We sought bean accessions that were early to nodulate, and tried to identify specific traits that contributed to this ability. A root-tip marking procedure was used to evaluate the earliness in nodulation of 40 accessions of common bean. With Rhizobium leguminosarum bv. phaseoli strain UMR1084 the accessions varied in uppermost nodule position relative to the root-tip mark (RTM; –2.05 mm to +6.12 mm), number of nodules produced above the RTM (0.57-3.93), and percentage of plants nodulated above this mark (37.7- 97.1%). Cultivars nodulated earlier with strain UMR1084 and UMR1899 than with strain UMR1242. Accessions RIZ23, RIZ108, N80068, and WI21-58 nodulated rapidly with all strains tested, while ‘Mantequilla tropical’, RIZ21, and 0051 were slow to nodulate. selected bean accessions were then examined for inoculum dose response with UMR1084, for the percentage of infection sites giving rise to nodules, for the rate of development of nodules in the period 16 to 25 days after planting (DAP), and for plant growth and accumulation of N at 51 DAP. In these studies, ‘Puebla 152’ showed excellent nodule development and growth to the 25 DAP harvest, while the experimental line RIZ21 accumulated significantly more N and grew better in the period 25 to 51 DAP. The differences between these two accessions could be exploited in breeding programs for enhanced nodulation and N₂ fixation in common bean.

Received for publication January 9, 1992.

This article has been cited by other articles:

				O. M. Aguilar, O. Riva, and E. Peltzer Analysis of Rhizobium etli and of its symbiosis with wild Phaseolus vulgaris supports coevolution in centers of host diversification PNAS, September 14, 2004; 101(37): 13548 - 13553. [Abstract] [Full Text] [PDF]