Root Isoflavonoid Response to Grafting between Wild-Type and Nodulation-Mutant Soybean Plants

Root Isoflavonoid Response to Grafting between Wild-Type and Nodulation-Mutant Soybean Plants.

It was previously reported that the hypernodulating soybean (Glycine max [L.] Merr.) mutants, derived from the cultivar Williams, had higher root concentration of isoflavonoid compounds (daidzein, genistein, and coumestrol) than did Williams at 9 to 12 days after inoculation with Bradyrhizobium japonicum. These compounds are known inducers of nod genes in B. japonicum and may be involved in sub...

Effect of inoculation and nitrogen on isoflavonoid concentration in wild-type and nodulation-mutant soybean roots.

The isoflavones, daidzein and genistein, have been isolated and identified as the major inducers of nod genes of Bradyrhizobium japonicum. The common nod genes of rhizobia are in turn responsible for stimulating root hair curling and cortical root cell division, the earliest steps in the host response. This study evaluated whether there was a relationship between root isoflavonoid production an...

Autoregulation of Nodulation in Soybean Plants

Infection by Heterodera glycines Elevates Isoflavonoid Production and Influences Soybean Nodulation.

High-performance liquid chromatography and Sinorhizobium fredii USDA191 nodC-lacZ gene fusion were used to monitor changes in the isoflavonoid content of soybean roots infected with Heterodera glycines isolate TN1. Isoflavonoid concentrations in infected roots of both H. glycines-resistant Hartwig and susceptible Essex soybean were two to four-fold higher than those of uninfected roots 2 and 3 ...

Nodulation, nutrient accumulation and yield of rainfed soybean in response to indigenous soybean-nodulating Bradyrhizobia in the Himalayan region of Kashmir-Pakistan

The use of efficient and effective nodulating Bradyrhizobia strains considered as anecologically and environmentally sound management strategy for soybean production. A 2-yr(2009 and 2010) field experiment was conducted to evaluate the effects of seven indigenousBradyrhizobium strains, one exotic TAL-102 and three N fertilizer rates, i.e., 25, 50 and 100kg N ha-1 on the productivity and N2 fixa...