Increased effectiveness of competitive rhizobium strains upon inoculation of Cajanus cajan

Journal Article · Tue Sep 01 00:00:00 EDT 1987 · Appl. Environ. Microbiol.; (United States)

OSTI ID:5933171

Hernandez, B S; Poth, M; Focht, D D

A field study was conducted in lysimeters containing /sup 15/N-enriched soil to determine the effects of four competitive rhizobium strains upon yield parameters of pigeon peas (Cajanus cajan). The greatest differences observed were in seed yields; strain P132 effected the highest seed yield (121 +/- 20 g per plant), and the control strain (indigenous rhizobia) effected the lowest yield (43.9 +/- 8 g per plant). With the exception of seeds and pods, the dry matter weights were not different. Although there appeared to be no effect by inoculum strains on the fractional content of N derived from biological nitrogen fixation when the total plant biomass was considered, strains P132 and 401 partitioned more of the N derived from fixation into seeds and leaves than did the other strains. Because the seeds comprised the major portion of plant N, more total N and more N derived from biological nitrogen fixation (about half of total N) were found in plants inoculated with P132, whereas the smallest amount was found in the uninoculated controls. P132 was also the best competitor with respect to indigenous rhizobia and accounted for all of the nodules found on the plants in which it was inoculated.

• Research Organization: Universidad de Panama, Panama City
• OSTI ID: 5933171
• Journal Information: Appl. Environ. Microbiol.; (United States), Vol. 53:9
• Country of Publication: United States
• Language: English

Related Subjects

59 BASIC BIOLOGICAL SCIENCES
LEGUMINOSAE
NITROGEN FIXATION
PRODUCTIVITY
RHIZOBIUM
GENETIC VARIABILITY
NITROGEN 15
SEEDS
TRACER TECHNIQUES
BACTERIA
BIOLOGICAL VARIABILITY
ISOTOPE APPLICATIONS
ISOTOPES
LIGHT NUCLEI
MICROORGANISMS
NITROGEN ISOTOPES
NUCLEI
ODD-EVEN NUCLEI
PLANTS
STABLE ISOTOPES
550501* - Metabolism- Tracer Techniques