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Alan W. Meerow and Timothy K. Broschat

Anatomical differences in leaves of queen palm [Syagrus romanzoffiana (Chamisso) Glassman] showing visible K, Mn, and Fe deficiency symptoms are described. Potassium-deficient leaves showed less organization in the mesophyll than healthy leaves. Adaxial fibers increased in diameter. Chloroplast frequency was reduced overall, but most severely in areas of the leaf showing gross symptoms of the deficiency. Manganese-deficient leaves had reduced chloroplast frequency, especially in tissue near necrotic areas, and thicker and more fibers per unit length. Iron-deficient leaves had few chloroplasts throughout the mesophyll, and also thicker and more fibers per unit length.

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Joseph P. Albano and William B. Miller

Marigold (Tagetes erecta L.) grown hydroponically in an irradiated nutrient solution containing FeDTPA had root ferric reductase activity 120% greater, foliar Fe level 33% less, and foliar Mn level 90% greater than did plants grown in an identical, nonirradiated solution, indicating that the plants growing in the irradiated solution were responding to Fe-deficiency stress with physiological reactions associated with Fe efficiency. The youngest leaves of plants grown in the irradiated solution had symptoms of Mn toxicity (interveinal chlorosis, shiny-bronze necrotic spots, and leaf deformation). Plants grown in irradiated solution in which the precipitated Fe was replaced with fresh Fechelate were, in general, no different from those grown in the nonirradiated solution. Chemical name used: ferric diethylenetriaminepentaacetic acid (FeDTPA).

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Eva Bacaicoa and Jose María García-Mina

, 2008 ; Curie and Briat, 2003 ; Fox and Guerinot, 1998 ; Robinson et al., 1999 ; Vert et al., 2002 ; Waters et al., 2002 ). The main response of the Strategy II plants (graminaceous monocots) under Fe deficiency is characterized by the increase in

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Lina Fu, Lijun Chai, Dekuan Ding, Zhiyong Pan, and Shu’ang Peng

photosynthetic electron transport and it functions as a cofactor for superoxide dismutases; Fe deficiency results in decreased concentrations of photosynthetic pigments and other components of the thylakoid membrane ( Morales et al., 1991 , 1994 ). Thus, Fe

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Monica Ozores-Hampton

biological nitrogen (N) fixation ( Hochmuth, 2011 ; Nenova, 2006 ). The lack of adequate Fe available for the plant can lead to Fe deficiency ( Broschat and Elliott, 2005 ; Koenig and Kuhns, 2010 ; Walworth, 2013 ). The primary symptom of Fe deficiency is

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Concetta Licciardello, Biagio Torrisi, Maria Allegra, Fabiola Sciacca, Giancarlo Roccuzzo, Francesco Intrigliolo, Giuseppe Reforgiato Recupero, Paola Tononi, Massimo Delledonne, and Vera Muccilli

., 2001 ). Approximately 20% to 50% of the fruit trees in the Mediterranean Basin suffer from Fe deficiency ( Jaegger et al., 2000 ) caused by high soil concentrations of calcium and bicarbonate. Although Fe is quite abundant, it is often a limiting

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Miguel Urrestarazu, Juan E. Alvaro, Soraya Moreno, and Gilda Carrasco

plants (T1) were supplied with Fe-EDTA from the beginning to the end of the test. Fig. 1. Iron (Fe) deficiency (central image) and a normal Fe status in bean plants (right) at the end of phase 2. Fig. 2. Iron (Fe) deficiency

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Brandon R. Smith and Lailiang Cheng

Chlorosis from lime-induced Fe deficiency limits grapevine ( Vitis L.) growth and productivity ( Bavaresco et al., 2003 ; Gruber and Kosegarten, 2002 ; Mengel et al., 1984a ). As soil pH increases, Fe solubility decreases, and an increase in

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Christopher S. Imler, Camila I. Arzola, and Gerardo H. Nunez

., 1987 ). Cells have a basal level of H + -ATPase activity, but several stimuli—such as cation uptake—can enhance this activity ( Haynes, 1990 ). P and Fe deficiencies also increase H + -ATPase activity in some plants, as roots acidify the rhizosphere to

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Timothy K. Broschat

), symptomatic leaves may green up as they mature. Leaf spot diseases such as exserohilum leaf spot (caused by Exserohilum rostratum ) on foxtail palm ( Wodyetia bifurcata ) often are associated with Fe deficiency ( Broschat and Elliott, 2005a ) and cannot be