Photosynthetica 2009, 47(1):1-10 | DOI: 10.1007/s11099-009-0003-x

Arbuscular mycorrhizal fungi and organic fertilizer influence photosynthesis, root phosphatase activity, nutrition, and growth of Ipomoea carnea ssp. fistulosa

L. Amaya-Carpio1, F.T. Davies Jr.1,*, T. Fox2, C. He1
1 Department of Horticultural Sciences and Faculty of Molecular and Environmental Plant Sciences (MEPS), Texas A&M University, College Station, USA
2 Department of Biology, University of West Florida, Pensacola, USA

The effect of arbuscular mycorrhizal fungi (AMF) inoculation and organic slow release fertilizer (OSRF) on photosynthesis, root phosphatase activity, nutrient acquisition, and growth of Ipomoea carnea N. von Jacquin ssp. fistulosa (K. Von Martinus ex J. Choisy) D. Austin (bush morning glory) was determined in a greenhouse study. The AMF treatments consisted of a commercial isolate of Glomus intraradices and a non-colonized (NonAMF) control. The OSRF was applied at 10, 30, and 100 % of the manufacturer's recommended rate. AMF plants had a higher net photosynthetic rate (P N), higher leaf elemental N, P, and K, and generally greater growth than NonAMF plants. Total colonization levels of AMF plants ranged from 27 % (100 % OSRF) to 79 % (30 % OSRF). Root acid phosphatase (ACP) and alkaline phosphatase (ALP) activities were generally higher in AMF than non-AMF plants. When compared to NonAMF at 100 % OSRF, AMF plants at 30 % OSRF had higher or comparable ACP and ALP activity, higher leaf elemental P, N, Fe, Cu, and Zn, and a greater P N (at the end of the experiment), leading to generally greater growth parameters with the lower fertility in AMF plants. We suggest that AMF increased nutrient acquisition from an organic fertilizer source by enhancing ACP and ALP activity thus facilitating P acquisition, increasing photosynthesis, and improving plant growth.

Keywords: chlorophyll; Glomus intraradices; leaf area; leaf area ratio; net photosynthetic rate; phosphatase; plant height; root; shoot; stomatal conductance

Received: April 7, 2008; Accepted: August 15, 2008; Published: March 1, 2009Show citation

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Amaya-Carpio, L., Davies, F.T., Fox, T., & He, C. (2009). Arbuscular mycorrhizal fungi and organic fertilizer influence photosynthesis, root phosphatase activity, nutrition, and growth of Ipomoea carnea ssp. fistulosa. Photosynthetica, 47(1), 1-10. doi: 10.1007/s11099-009-0003-x.
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