Open AccessQuantitative and time‐course evaluation of nodulation competitiveness of rhizobitoxine‐producing Bradyrhizobium elkanii
Author(s) -
Okazaki Shin,
Yuhashi KenIchi,
Minamisawa Kiwamu
Publication year - 2003
Publication title -
fems microbiology ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.377
H-Index - 155
eISSN - 1574-6941
pISSN - 0168-6496
DOI - 10.1016/s0168-6496(03)00132-6
Subject(s) - biology , microbial inoculant , rhizosphere , bradyrhizobium , competition (biology) , bradyrhizobium japonicum , symbiosis , strain (injury) , botany , rhizobiaceae , inoculation , horticulture , bacteria , ecology , genetics , anatomy
Regression analysis of results from a mathematical competition model showed that rhizobitoxine production by Bradyrhizobium elkanii USDA94 gave this strain a nodulation competitiveness about 10 times greater than that of a non‐rhizobitoxine‐producing mutant strain on Macroptilium atropurpureum (Siratro). Rhizobitoxine enhancement of competitive nodulation occurred at a late stage in the time‐course of nodulation. All other known rhizobial factors that affect nodulation competitiveness act in the rhizosphere and during the initial interaction with legumes. This unique late action of rhizobitoxine could prove advantageous in inoculant production, because inoculum often fails to nodulate in the latter stages of nodulation kinetics.