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The amount of root-exuded malic acid and chlorophyll fluorescence parameters (the minimum chlorophyll fluorescence; the maximum quantum yield of photosystem II) in four plant species (Broussonetia papyrifera, Morus alba, Orychophragmus violaceus and Brassica napus) at different phosphorus levels was studied. A linear equation presents the minimum chlorophyll fluorescence (Fo) or the maximum quantum yield of photosystem II (Fv/Fm) and the amount of root-exuded malic acid. Broussonetia papyrifera and Orychophragmus violaceus easily adapted to a low-phosphorus environment. A low-cost method was used for assessing plant adaptability to a lowphosphorus environment when no chlorophyll fluorescence instrument was available. © 2013 Chilean Society of Soil Science.

Root-exuded malic acid versus chlorophyll fluorescence parameters in four plant species under different phosphorus levels