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Indian Journal of Experimental Biology (IJEB) >
IJEB Vol.44 [2006] >
IJEB Vol.44(03) [March 2006] >
| Title: | Host range nodulation and adaptation in frenchbean rhizobia |
| Authors: | Dhar, B
Mishra, Ashok
Singh, M K |
| Keywords: | Adaptation
Frenchbean rhizobia
Legume hosts
Symbiotic efficiency |
| Issue Date: | Mar-2006 |
| Publisher: | CSIR |
| Abstract: | The host range nodulation efficiency of four
genetically marked frenchbean rhizobial strains (HURR-3, Raj-2, Raj-5 and
Raj-6) was studied with five legume hosts namely, frenchbean (Phageolus vulgaris L.), pigeonpea [Cajanus cajan (L.) Millsp.], mungbean [Vigna radiata (L.) Wilezek.], urdbean [Vigna mungo (L.) Hepper.] and soybean [Glycine max (L.) Merril.]. Except
soybean and pigeonpea, all other legume hosts were nodulated by two or more
frenchbean rhizobial strains tested. Rhizobia were isolated from nodules
produced by strains, HURR-3 and Raj-5, on main (frenchbean) and different
(mungbean and urdbean) hosts. There was marked improvement in host range
nodulation and nitrogen fixation efficiency of rhizobial strains, HURR-3 and
Raj-5, after their isolation from chance nodules on different hosts. This is
clearly evident from the ability of such isolates to form nodules on pigeonpea
besides mungbean and urdbean, and higher nodulation in all the above three
different hosts. The phage-susceptibility pattern and intrinsic antibiotic
resistance (used as markers) of the two strains did not change after their
passage through different hosts. The results indicate that frenchbean rhizobia
had undergone some modification in symbiotic behaviour to adapt to wide host
range during their passage through different (alternate?) hosts. |
| Page(s): | 250-253 |
| ISSN: | 0975-1009 (Online); 0019-5189 (Print) |
| Source: | IJEB Vol.44(03) [March 2006]
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