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ARS Home » Southeast Area » Mayaguez, Puerto Rico » Tropical Crops and Germplasm Research » Research » Publications at this Location » Publication #318503

Research Project: Genetic Enhancement of Common Bean Using Exotic Germplasm for Biotic and Abiotic Stress Tolerance

Location: Tropical Crops and Germplasm Research

Title: Evaluation of the reaction oof interspecific hybrids of common bean and tepary bean to Bradyrhizobium y Rhizobium

Author
item Estevez De Jensen, Consuelo - University Of Puerto Rico
item Porch, Timothy - Tim
item Beaver, James - University Of Puerto Rico

Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 4/15/2015
Publication Date: N/A
Citation: N/A

Interpretive Summary: Interspecific hybrids between common bean, Phaseolus vulgaris L., and tepary bean, Phaseolus acutifolius A. Gray, have the potential to increase bean production in regions where rainfall is limited. In 2014, an experiment was initiated using a split-plot design. The treatments included inoculation, no inoculation, and NPK fertilization. Twelve interspecific hybrids, three genotypes of tepary bean, and common beans "Verano" and TARS-LFR1 were inoculated separately with Bradyrhizobium strain 3254 (interspecific hybrids and tepary) and Rhizobium CIAT tropici 899 (common beans). Nodulation was evaluated 21 days after inoculation. Interspecific hybrids INB 817, INB 848, INB 846, INB 829, and INB 809 had an average of 38 nodules per plant. In contrast, the teparies PI-440801, PI-440802 and PI-440799 had an average of 1.5 nodules per plant. Verano and TARS-LFR1 had an average of 42 nodules per plant and the nodules were similar in size to those produced in the interspecific hybrids. Significant differences between the inoculated and uninoculated treatment was observed. TARS-LFR1, Verano and the interspecific hybrids INB 835, INB 848 and INB 809 were superior in nodule number over the other genotypes. The data indicated differences between tepary and common bean yields, with TARS-LFR1 the showing the highest yield. The interspecific hybrids showed high nodulation potential with Rhizobium tropici 899 that was similar to Verano.

Technical Abstract: Interspecific hybrids between common bean, Phaseolus vulgaris L., and tepary bean, Phaseolus acutifolius A. Gray, have the potential to increase bean production in regions where rainfall is limited. In 2014, an experiment was initiated using a split-plot design. The treatments included inoculation, no inoculation, and NPK fertilization. Twelve interspecific hybrids, three genotypes of tepary bean, and common beans "Verano" and TARS-LFR1 were inoculated separately with Bradyrhizobium strain 3254 (interspecific hybrids and tepary) and Rhizobium CIAT tropici 899 (common beans). Nodulation was evaluated 21 days after inoculation. Interspecific hybrids INB 817, INB 848, INB 846, INB 829, and INB 809 had an average of 38 nodules per plant. In contrast, the teparies PI-440801, PI-440802 and PI-440799 had an average of 1.5 nodules per plant. Verano and TARS-LFR1 had an average of 42 nodules per plant and the nodules were similar in size to those produced in the interspecific hybrids. Significant differences between the inoculated and uninoculated treatment was observed. TARS-LFR1, Verano and the interspecific hybrids INB 835, INB 848 and INB 809 were superior in nodule number over the other genotypes. The data indicated differences between tepary and common bean yields, with TARS-LFR1 the showing the highest yield. The interspecific hybrids showed high nodulation potential with Rhizobium tropici 899 that was similar to Verano.