Abstract
Roots of sour orange (Citrus aurantium L.) seedlings were inoculated with the vesicular-arbuscular mycorrhizal (VAM) fungus,Glomus intraradices Schenck and Smith or provided an inoculum filtrate (non-VAM plants) and fertilized with weekly applications of 0.0, 6.25, 25.0 or 100.0 mg P solution per 1200 ml container. Colonization was lower after the first 9 weeks with increased P, but P caused little inhibition of colonization after 26 weeks. Leaft tissue levels of P were higher with VAM colonization and high P fertilization. Photosynthetic rates were correlated with P content in leaf tissue of control plants, but no correlation was observed for VAM infected seedlings. Results suggested that factors in addition to improved P nutrition influence photosynthetic rates of VAM plants.
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