Effect of symbiotic associations on growth of host Coriaria nepalensis and its facilitative impact on oak and pine seedlings in the Central Himalaya
2003
Tiwari, M. | Singh, S.P. | Tiwari, A. | Sundriyal, R.C.
Effect of symbiotic association of actinorrhiza (Frankia) and arbuscular mycorrhiza on the seedling growth of host Coriaria nepalensis, and its facilitative effect on two important non-host seral tree species, i.e. oak (Quercus leucotrichophora) and pine (Pinus roxburghii) was studied. C. nepalensis showed dual symbiosis of actinorrhiza and arbuscular mycorrhiza. There was a significant increase in seedling growth of C. nepalensis when inoculated with arbuscular mycorrhiza compared with those inoculated with actinorrhiza. When seedlings of C. nepalensis were dual inoculated (with arbuscular mycorrhiza and actinorrhiza), improvement in growth was more than the sum of the individual effects of both symbionts. In dual inoculated C. nepalensis seedlings, arbuscular mycorrhiza also significantly increased nodule biomass. Actinorrhiza did not affect mycorrhizal status. The facilitative effect of C. nepalensis on the seedling growth of oak and pine was significant with arbuscular mycorrhiza, and among species the effect was more on pine than oak. The study reveals that the symbiotic association of microorganisms is useful not only to the host plant but also to neighbouring species, thus could be exploited for land rehabilitation in the scarce environment.
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