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Dong Sik Yang, Ki-Cheol Son, and Stanley J. Kays

indoor concentration of benzene and toluene was reduced by Hedera helix L., Spathiphyllum wallisii Regal, Syngonium podophyllum Schott., and Cissus rhombifolia Vahl. ( Yoo et al., 2006 ). There are substantial differences in the rate of removal

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Alicia Rihn, Hayk Khachatryan, Benjamin Campbell, Charles Hall, and Bridget Behe

A rating-based conjoint experiment combined with eye-tracking analysis was used to investigate the effect of plant attributes on consumer purchase likelihood for indoor foliage plants. The experiment assessed the effects of plant type (Dracaena marginata Lam., Guzmania lingulata, or Spathiphyllum wallisii Regel), volatile organic compound (VOC) removal capacity (high, low, or none specified), price ($10.98–14.98/plant), production method [certified organic, organic production (not certified), or conventional], and origin (in-state, domestic, or imported) on consumer preferences. An ordered logit model was used to analyze the data. Organic production methods, in-state origin, domestic origin, and high VOC removal increased participants’ purchase likelihood. Visually attending to the highest price point ($14.98) increased consumers’ purchase likelihood. Age, gender, child (<12 years), pet, relationship status, education, and ethnicity affected participants’ purchase likelihood for indoor foliage plants. Purchasing barriers for indoor foliage plants are also discussed. Results have implications for indoor foliage plant growers and retailers as they produce, promote, and sell their products.

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M.Y.C. Goo and B.S. Sipes

Fourteen tropical ornamental plants were evaluated for their host status to a population of Radopholus citrophilus isolated from anthurium. No nematodes were recovered from the roots of Aglaonema commutatum, Caryota mitis, Cycas revoluta, Dracaena deremensis, Neodypsis decaryii, Ravenea spp., or Spathiphyllum wallisii 5 months after inoculation, making these plants nonhosts. Low numbers of R. citrophilus were recovered from the roots of Phoenix roebellinii, Rhapis excelsa, and Howea forsteriana, suggesting that they were poor hosts to this nematode population. Anthurium trifidum, Chamaedorea neathebella, Chamaedorea seifrizii, and Calathea variegata were hosts for the nematode, allowing population increases of 2.47 to 29.92 times the inoculation density. C. seifrizii and C. variegata represent new hosts of R. citrophilus.

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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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Richard J. Henny, James R. Holm, Jianjun Chen, and Michelle Scheiber

Spathiphyllum wallisii Regal ( Eeckhaut et al., 2004 ). However, chemical induction of polyploidy has not been reported in Dieffenbachia . The objectives of this study were to use colchicine to induce tetraploids of Dieffenbachia × ‘Star Bright M-1’ in vitro

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Jin-Hu Wu, A. Ross Ferguson, Brian G. Murray, Alison M. Duffy, Yilin Jia, Canhong Cheng, and Philip J. Martin

al., 2012 ), and in Spathiphyllum wallisii, biomass production of tetraploids was less than that of their diploid progenitors ( Van Laere et al., 2011 ). In other cases, however, doubling the chromosome number tended to improve fruit quality

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Dong Sik Yang, Svoboda V. Pennisi, Ki-Cheol Son, and Stanley J. Kays

deremensis and Spathiphyllum wallisii ( Wood et al., 2002 ). Trichloroethylene. The six species that effectively removed toluene also had superior TCE removal efficiencies: H. alternata (11.08 μg·m −3 ·m −2 ·h −1 ), H. helix (8.07), T. pallida

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Hamidou F. Sakhanokho, Kanniah Rajasekaran, Rowena Y. Kelley, and Nurul Islam-Faridi

, E.J. Debergh, P.C. 2004 Chemically induced polyploidization in Spathiphyllum wallisii Regel through somatic embryogenesis Plant Cell Tiss. Org. Cult. 78 241 246 Eigsti, D.I. Dustin, P. 1995

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Jennifer S. Doxey, Tina Marie Waliczek, and Jayne M. Zajicek

obtusifolia (Baby Rubber Tree Peperomia) were used. An assortment of foliage of various colors, sizes, and textures such as Spathiphyllum wallisii ‘Mauna Loa’ (Peace Lily), small Kalanchoe blossfeldiana (Kalanchoe), and Epipremnum aureum (Pothos) were

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Mingxiu Liu, Peng Wang, Xu Wei, Qing Liu, Xiaolin Li, Guolu Liang, and Qigao Guo

Huylenbroeck, J. Steppe, K. Van Labeke, M.C. 2011 Influence of ploidy level on morphology, growth and drought susceptibility in Spathiphyllum wallisii Acta Physiol. Plant. 33 1149 1156 Wang, W.X. Guo, Q.G. Xiang, S.Q. Li, L.X. Liang, G.L. 2003 Study on the