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Kristin L. Getter and Bridget K. Behe

Impatiens walleriana (bedding impatiens) is a colorful shade-tolerant annual that is widely used in the landscape and in hanging baskets. This species flowers in shade during most summer months (June to August) and is among the more affordable

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Weining Wang, Yanhong He, Zhe Cao, and Zhanao Deng

Garden impatiens ( I. walleriana , Balsaminaceae) has been a top-selling bedding plant in the United States, generating an estimated wholesale value of 150 million dollars in 2005 ( USDA/NASS, 2006 ). This plant’s popularity in the floriculture and

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Rebecca A. Schnelle and James E. Barrett

designed to further investigate the impacts of these environmental and cultural factors on the efficacy of paclobutrazol liner dips. Three vegetatively propagated bedding plants were used: ‘Suncatcher Plum’ petunia, ‘Double Fiesta Rose’ impatiens, and

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Bejie Herrin and Daniel Warnock

a thesis submitted by Bejie Herrin. The authors gratefully acknowledge PanAmerican Seed Co., Express Seed Co., and Sandoz Seeds of Novartis Co. for the donation of impatiens seed.

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Nicholas P. Howard, Dennis Stimart, Natalia de Leon, Michael J. Havey, and William Martin

Impatiens currently are among the most valuable and widely cultivated floriculture crops in the world ( Uchneat, 2006 ). Its popularity is attributed to its wide array of available colors, preference for growing in shade, and ease of use as a

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Kimberly A. Cochran and Craig S. Rothrock

important crops for commercial production. R. solani AG4 causes crown and root rots on ornamentals including petunia ( Wright et al., 2004 ) and impatiens ( Diab et al., 2003 ; Honeycutt and Benson, 2001 ). The high cost of chemical treatments and label

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David Cross and Roger Styer

Impatiens (Impatiens wallerana Hook.f.) flower seeds are believed to be sensitive to storage temperature and humidity conditions. A study was conducted to evaluate seed quality changes occurring during a 1-year period of storage under various temperature and humidity combinations. Four seed lots of `Super Elfin Red' and `Super Elfin White' impatiens were studied. Constant humidity treatments were obtained using saturated salt solutions; 15% relative humidity (RH) with LiCI, 25% RH with KAc, 33% RH with MgCl2, and 43% RH with K2CO3. Constant temperature treatments were 5, 15, and 22C. At 3-month intervals, replicate samples were sown in plug flats in the greenhouse. Seed quality was evaluated as the percentage of usable seedlings 21 days from sowing. Rapid deterioration of seed quality was seen under high temperature and high humidity storage conditions. Seeds became less sensitive to humidity at 5C. Conditions of 20% to 25% RH and 5C are recommended for impatiens seed storage.

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Nicole L. Waterland and Richard J. Gladon

Bedding plants account for ≈50% of the wholesale value of greenhouse crops in the United States ( Miller, 2004 ; USDA, 2007 ). Virtually all bedding plants, including impatiens, are produced from plugs, and the use of plug trays has caused an

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Daniel F. Warnock

1 Assistant Professor. This research was supported in part by funds from USDA CRIS Hatch Project ILLU-65-0308. The author gratefully acknowledges PanAmerican Seed Co. for the donation of impatiens seed.

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Maryke A. Cleland, Cynthia Jones, and Mark H. Brand

An interspecific hybridization program involving five species of Impatiens was initiated to delineate incompatibility barriers. With the exception of one cross, no viable hybrid seed was recovered. Fluorescence microscopy revealed foreign pollen tubes to reach ovules in all crosses, although not all ovules were approached. A histological study involving I. auricoma Baill. and I. walleriana Hook f. ensued to confirm the presence of hybrid embryos. Developing I. walleriana × I. auricoma and reciprocal hybrid embryos were compared to self embryos. Development of hybrid embryos was delayed as early as five days post-pollination. I. walleriana × I. auricoma embryos continued to develop for 8 days post-pollination, but did not reach a size greater than a 5-day self embryo. Excessive endosperm was observed in the hybrid. I. auricoma × I. walleriana embryos continued to enlarge up to ovary abortion but did not reach a size greater than a 7-day self embryo and little to no endosperm developed. Disintegration of ovules included disorganization and collapse of the endosperm, and vacuolization and loss of turgidity of the embryo.