High effectiveness of exotic arbuscular mycorrhizal fungi is reflected in improved rhizobial symbiosis and trehalose turnover in Cajanus cajan genotypes grown under salinity stress |
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| Affiliation: | 1. Hokkaido Agricultural Research Center, National Agriculture and Food Research Organization, Hitsujigaoka, Sapporo 062-8555, Japan;2. Institute of Agrobiological Sciences, National Agriculture and Food Research Organization, 2-1-2 Kannnondai, Tsukuba 305-8602, Japan;3. Graduate School of Agriculture, Hokkaido University, Kita-ku, Sapporo 060-8589, Japan |
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| Abstract: | Arbuscular mycorrhizal fungi (AMF) improve functioning of legume-Rhizobium symbiosis under salinity. However, plant responses to mycorrhization vary depending on the plant and fungal species. The current study aimed to compare the effectiveness of a native inoculum from saline soil and two exotic isolates, Funneliformis mosseae and Rhizophagus irregularis on two Cajanus cajan (pigeonpea) genotypes (Paras, Pusa 2002) subjected to NaCl stress. Salinity depleted nodulation and nutrient status in both genotypes with higher negative effects in Paras. Although all AM fungi improved growth, R. irregularis performed better by promoting higher biomass accumulation, nodulation, N2 fixation and N, P uptake which correlated with higher AM colonization. R. irregularis inoculated plants also accumulated higher trehalose in nodules due to decreased trehalase and increased trehalose-6-P synthase, trehalose-6-phosphatase activities. The results suggest that higher stability of R. irregularis-pigeonpea symbiosis under salt stress makes it an effective ameliorator for overcoming salt stress in pigeonpea. |
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| Keywords: | Functional diversity Leghemoglobin Native inoculum Nodulation Nitrogen fixation Salinity Trehalose |
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