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Nicole L. Waterland, Youyoun Moon, Janet C. Tou, Moo Jung Kim, Eugenia M. Pena-Yewtukhiw, and Suejin Park

leaves. In some plant cultivars, pigmentation has been related to mineral content. Previously, we demonstrated that romaine and crisphead lettuces grown under greenhouse conditions showed significantly higher K and P concentrations in red leaf cultivars

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Robert E. Rouse

The Minolta chlorophyll meter SPAD-502 (Minolta Camera Company, 101 Williams Drive, NJ 07446, USA) has been found to be a quick, accurate, simple, and nondestructive way to determine chlorophyll content in citrus leaves and a standard curve had been developed. The SPAD-502 chlorophyll meter was used to measure chlorophyll content in citrus leaves of ten varieties on three rootstocks. Leaf mineral analysis was then determined on these leaves for N, P, K, Mg, Mn, Zn, Fe, Cu and Ca. Correlation r values were generally low and not significant for most nutrient elements but were highest for Fe and Ca. The relationship of leaf nutrient levels and chlorophyll meter readings are not understood. The usefulness of the SPAD chlorophyll meter for determining mineral content in citrus leaves is not yet known.

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Martin M. Maboko, Christian Phillipus Du Plooy, and Silence Chiloane

mineral content with the exception of N. Fruit were sliced and oven-dried for 72 h at 70 °C. Nitrogen was determined on dry-milled material using a Carlo Erba NA 1500 C/N/S analyzer (Thermo Scientific, Milan, Italy) according to Jimenez and Ladha (1993

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Shirin Shahkoomahally, Jose X. Chaparro, Thomas G. Beckman, and Ali Sarkhosh

crops Front. Plant Sci. 7 1457 North, M. Cook, N. 2006 Effect of six rootstocks on ‘Forelle’ pear tree growth, production, fruit quality and leaf mineral content Acta Hort 772 97 103 Reighard, G. Bridges, W. Rauh, B. Mayer, N. 2012 Prunus rootstocks

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Metin Turan, Ertan Yildirim, Melek Ekinci, and Sanem Argin

treatments also affected the mineral content of tomato leaves, fruits, and roots compared with the control ( Figs. 3 and 4 ). Plants in soil I generally had a higher plant nutrient content than those grown in soil II. The RE and FU treatments increased the

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Larry R. Parsons and T. Adair Wheaton

Highly treated sewage effluent water increasingly is being used for agricultural irrigation. This reclaimed water is presently being used in a large citrus irrigation project in central Florida. The purpose of this study was to determine the effects of high application rates of reclaimed water on growth and leaf mineral content of young citrus trees. High application rates (1270 and 2540 mm per year) of reclaimed wastewater were compared to a normal recommended rate of 406 mm per year of either reclaimed or well water. Tree growth was greater at the higher application rates, but these rates also promoted greater weed growth. With reclaimed water, leaf Na, Cl, and K contents generally increased with increasing irrigation rate, but these levels remained well below levels that would cause plant damage. Leaf Cl accumulation was much higher in `Hamlin' orange than `Orlando' tangelo. Rootstock also affected leaf Na and Cl accumulation. Reclaimed water appears to be a useful alternative to well water for citrus irrigation.

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Carl E. Niedziela Jr., Mary A. Depa, Paul V. Nelson, Daniel H. Willits, Mary M. Peet, David A. Dickey, and Nancy C. Mingis

, 11 pages Overdieck, D. 1993 Elevated CO 2 and the mineral content of herbaceous and woody plants Vegetatio 104/105 402 411 Patterson, D.T. Flint, E.P. 1982 Interacting effects of CO 2 and nutrient concentration Weed Sci. 30 389 394 Peet, M

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Martin Makgose Maboko, Isa Bertling, and Christian Phillipus Du Plooy

influenced fruit mineral content, with TC conditions significantly improving fruit macro- and microelement concentrations ( Table 4 ). Table 4. Effect of treatment on nutrient content of tomato fruits (dry mass) harvested from the fifth truss. Fruit from

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Melek Ekinci, Ertan Yildirim, Atilla Dursun, and Metin Turan

, chlorophyll and mineral content of cucumber ( Cucumis sativus L.) grown under salt stress J. Plant Nutr. 31 593 612 Yu, J.Q. Huang, L.F. Hu, W.H. Zhou, Y.H. Mao, W.H. Ye, S.F. Nogues, S. 2004 A role for brassinosteroids in regulation of photosynthesis in

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Michael V. Mickelbart and Thomas E. Marler

Sapodilla [Manilkara zapota (L.) Royen], reportedly tolerant of saline conditions relative to other tropical fruit species, was studied in sand culture under greenhouse conditions to examine the physiology of sapodilla trees exposed to NaCl and to aid in determining the basis for this apparent tolerance. Treatments, consisting of a complete nutrient solution of 1 dS·m–1 (control) or this solution amended to 12 or 20 dS·m–1 with NaCl, were administered from 16 Nov. 1991 until 29 Jan. 1992. Net CO2 assimilation (A) of plants receiving NaCl gradually decreased relative to that of the control plants. At the end of 8 weeks of salinity, A of plants receiving 12 or 20 dS·m–1 was 72% or 31% of control plants, respectively. Substrate NaCl reduced apparent quantum yield, photosynthetic CO2-use efficiency, leaf osmotic potential, and predawn xylem potential of sapodilla leaves. Dark respiration and the variable: maximal chlorophyll fluorescence ratio were not influenced by NaCl. Exposure to NaCl also increased leaf tissue Na+ and Cl concentrations and the Na+: K+ ratio. These results indicate that gas exchange of sapodilla is relatively low for woody evergreen species. Moreover, sapodilla may not be as tolerant of salt stress as previously reported. The responses of sapodilla to root zone NaCl were consistent with other woody perennial glycophyte species. Photochemical efficiency of leaves on plants receiving NaCl was not different from that of leaves on control plants for >8 weeks after NaCl reduced gas exchange.