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D.J. Norman, R.J. Henny, J.M.F. Yuen and T.A. Mellich

Commercially grown cultivars of Syngonium (Araceae) are very susceptible to Myrothecium leaf spot (incited by Myrothecium roridum Tode ex Fr.). Therefore, cultivation of Syngonium requires rigorous sanitation and frequent applications of fungicides for disease control. The goal of this research was to identify species and noncultivated accessions of Syngonium resistant to Myrothecium leaf spot. Five commercial cultivars and 30 accessions, comprising 16 different Syngonium species, were screened for resistance to M. roridum. All five commercial cultivars were susceptible to M. roridum. However, seven species (S. neglectum, S. wendlandii, S. dodsonianum, S. erythrophyllum, S. chiapense, S. dodsonianum, and S. angustatum) showed the highest resistance, as did two noncultivated accessions of S. podophyllum. The information on disease resistance for these species and accessions will be useful in future breeding work.

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Mung Hwa Yoo, Youn Jung Kwon, Ki-Cheol Son and Stanley J. Kays

Foliage plants of Hedera helix L. (english ivy), Spathiphyllum wallisii Regal (peace lily), Syngonium podophyllum Schott. (nephthytis), and Cissus rhombifolia Vahl. (grape ivy) were evaluated for their ability to remove two indoor volatile organic air pollutants, benzene and toluene. Removal was monitored when the aerial portion of plants was exposed singly to 1 μL·L-1 or to 0.5 μL·L-1 of each gas in a closed environment over 6-hour periods during the day and the night. Selected physiological processes were assessed before and immediately after treatment to determine the effect of the gases on the plants. The effectiveness of plants in the removal of air pollutant(s) varied with species, time of day, and whether the gases were present singly or as a mixture. When exposed to a single gas, S. wallisii, S. podophyllum, and H. helix displayed higher removal efficiencies (ng·m-3·h-1·cm-2 leaf area) of either gas than C. rhombifolia during the day. The efficiency of removal changed when both gases were present; H. helix was substantially more effective in the removal of either benzene or toluene than the other species, with the removal of toluene more than double that of benzene. When exposed singly, the removal of both compounds was generally higher during the day than during the night for all species; however, when present simultaneously, H. helix removal efficiency during the night was similar to the day indicating that stomatal diffusion for english ivy was not a major factor. The results indicated an interaction between gases in uptake by the plant, the presence of different avenues for uptake, and the response of a single gas was not necessarily indicative of the response when other gases are present. Changes in the rates of photosynthesis, stomatal conductance, and transpiration before and after exposure indicated that the volatiles adversely affected the plants and the effects were not consistent across species and gases. Deleterious effects of volatile pollutants on indoor plants may be critical in their efficacy in improving indoor air quality and warrant further study.

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Arianna Bozzolo and Michael R. Evans

such as in industrial components, various fillers, insulators, or as compounds to be mixed with other materials. Limited research has been reported regarding granulated cork in substrates. Bazzocchi and Giorgioni (1987) reported that nephthytis

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Jin Cui, Juanxu Liu, Min Deng, Jianjun Chen and Richard J. Henny

Syngonium podophyllum Schott, commonly known as arrowhead vine, goosefoot plant, or nephthytis, belongs to the family Araceae and occurs indigenously on humid forest floors of Central and South America ( Croat, 1982 ). As a result of their

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Min Deng, Jianjun Chen, Richard J. Henny and Qiansheng Li

encyclopedia: Crotons of the world Valkaria Tropical Garden Valkaria, FL Chen, J. Henny, R.J. Devanand, P.S. Chao, C.T. 2006 AFLP analysis of nephthytis ( Syngonium podophyllum Schott) selected from

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Zhanao Deng, Fahrettin Goktepe, Brent K. Harbaugh and Jinguo Hu

81 87 Chen, J. Henny, R.J. Devanand, P.S. Chao, C.T. 2006 AFLP analysis of nephthytis ( Syngonium podophyllum Schott) selected from somaclonal variants Plant Cell Rep. 24 743 749