Influence of Glomus microcarpum and rock phosphate on photosynthetic co₂ assimilation and tissue phosphorus content in sweet potato

Harikumar, V. S. and Potty, V. P. (2009) Influence of Glomus microcarpum and rock phosphate on photosynthetic co₂ assimilation and tissue phosphorus content in sweet potato. Journal of Tropical Plant Physiology, 3. pp. 25-36.

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Abstract

A study was conducted to examine the influence of arbuscular mycorrhizal (AM) fungus Glomus microcarpum and rock phosphate (RP) fertilization on photosynthetic CO₂ assimilation and tissue phosphorus (P) content in sweet potato. Sweet potato (cv. Kanjangad) was maintained under glasshouse condition for 45 days in earthen pots containing sterilized laterite (Oxisol) soil with three levels of RP fertilization 2.8, 5.6 and 8.4 mg kg-¹ soil in addition to the available P in the soil. The investigation revealed that mycorrhizal inoculation resulted in improvement of the percentage root colonization by AM, CO₂ assimilation and tissue P content in sweet potato at all stages of growth. Percentage root colonisation, Pn rate and tissue P was comparatively more under low to medium level of RP fertilization. Values of the measured parameters showed a general decline as the days after inoculation (DAI) advanced. Tissue P content did not show any definite relationship with net photosynthesis (Pn) rate.

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