Response of the Pigeonpea-Rhizobium symbiosis to salinity stress: variation among Rhizobium strains in symbiotic ability

    Rao, G V S and Johansen, C and Rao, J V D K K and Jana , M K (1990) Response of the Pigeonpea-Rhizobium symbiosis to salinity stress: variation among Rhizobium strains in symbiotic ability. Biology and Fertility of Soils, 9 (1). pp. 49-53. ISSN 0178-2762

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    Abstract

    There were significant differences among pigeonpea [Cajanus cajan (L.) Millsp] Rhizobium sp. strains (IC 3506, IC 3484, IC 3195, and IC 3087) in their ability to nodulate and fix N2 under saline conditions. Pigeonpea plants inoculated with IC 3087 and IC 3506 were less affected in growth by salinity levels of 6 and 8 dS m-1 than plants inoculated with the other strains. For IC 3506, IC 3484, and IC 3195, there was a decrease in the number of nodules with increasing salinity, while the average nodule dry weight and the specific nitrogenase activity remained unaffected. However, in IC 3087, the number of nodules increased slightly with increasing salinity. Leaf-P concentrations increased with salinity in the inoculated plants irrespective of the Rhizobium sp. strain, and leaf-N concentrations decreased with increasing salinity in IC 3484 and IC 3195 only. Shoot-Na and-Cl levels were further increased in these salt-sensitive strains only at 8 dS m-1. Therefore there may be scope for selecting pigeonpea Rhizobium sp. symbioses better adapted to saline conditions. The Rhizobium sp. strains best able to form effective symbioses at high salinity levels are not necessarily derived from saline soils

    Item Type: Article
    Divisions: UNSPECIFIED
    CRP: UNSPECIFIED
    Uncontrolled Keywords: Cajanus cajan, Pigeonpea, Rhizobium variation, Salinity stress, Symbiotic nitrogen fixation
    Subjects: Mandate crops > Pigeonpea
    Depositing User: Mr B K Murthy
    Date Deposited: 24 Mar 2014 10:08
    Last Modified: 24 Mar 2014 10:08
    URI: http://oar.icrisat.org/id/eprint/7687
    Official URL: http://dx.doi.org/10.1007/BF00335861
    Projects: UNSPECIFIED
    Funders: UNSPECIFIED
    Acknowledgement: We are indebted to Dr D. L. Oswalt and Dr F. B. Lopez, ICRISAT, India, for their constructive criticism of the manuscript. .
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