that changes seasonally and with external events (e.g., weather patterns, pest outbreaks, and trends). Materials and methods The workshop was held at the Annual Conference of the American Society for Horticultural Science on 22 July 2013 in Palm Desert
Ellen M. Bauske, Gary R. Bachman, Lucy Bradley, Karen Jeannette, Alison Stoven O’Connor and Pamela J. Bennett
Haiying Liang, Bing-Qing Hao, Guo-Chen Chen, Hang Ye and Jinlin Ma
China, as well as in Japan, however, to a lesser extent. Camellia is one of the four main oil-bearing trees along with olive, palm, and coconut in the world ( Robards et al., 2009 ). Oil from camellia seeds is also known as “Eastern Olive Oil,” because
John Erwin, Ken Altman and Fran Esqueda
increased from 10 to 22 °C on mescal agave, ‘Firebird’ aloe, Sunrise anacampseros, ponytail palm, subsessilis echeveria, zebra plant, prostrate rainbow bush, burro’s tail, and ‘Sir William Lawrence’ houseleek ( Table 2 ). ‘Arizona Snowcap’ mammillaria
Mohammed Aziz Elhoumaizi, Panchanoor S. Devanand, Jinggui Fang and Chih-Cheng T. Chao
We studied 66 `Medjool' date palm (Phoenix dactylifera L.) accessions from Morocco, six varieties of dates from Egypt, and four `Medjool' accessions and one `Deglet Noor' accession from California to investigate the hypothesis that `Medjool' is a landrace variety in Morocco. We used four sets of fluorescent-labeled amplified fragment length polymorphism (AFLP) markers to examine these accessions. A total of 402 bands were generated, of which 217 were polymorphic (54.0%). The 66 `Medjool' accessions from Morocco shared a minimum of 79% genetic similarity. These results support the hypothesis that `Medjool' is a landrace variety in Morocco and it is not genetically uniform. `Medjool' is the first confirmed landrace variety of date palm in the world. This finding raises the possibility that other date palms may be landrace varieties in different growing areas. Confirmation of a landrace variety in date palm has significant implication for future date palm germplasm collection and preservation. The mechanism(s) generating the genetic variation within `Medjool' accessions remains unknown. One possibility is that spontaneous genetic changes could occur frequently within vegetative tissues like offshoots under high temperature and drought stress.
Kimberly A. Klock-Moore and Timothy K. Broschat
In this study, areca palm (Dypsis lutescens), crossandra (Crossandra infundibuliformis), pentas (Pentas lanceolat), and philodendron (Philodendron) `Hope' plants were transplanted into containers filled with four growing substrates and watered daily, every 2 days, or every 3 days using subirrigation or overhead irrigation. Plants were grown in either a pine bark/sedge peat/sand substrate (BSS), Metro-mix 500 (MM), Pro-mix GSX (PM), or a 60% biosolid substrate (SYT). For both irrigation systems, final shoot dry weight of pentas, crossandra, philodendron, and areca palm plants in each substrate was greatest for plants watered every day and least for plants watered every 3 days. At all three irrigation frequencies, pentas, crossandra, and philodendron shoot dry weight in subirrigated pots filled with PM was greater than in overhead watered pots filled with PM. PM had the highest total pore space and moisture content of the four substrates examined. There was no difference in pentas, crossandra, or philodendron shoot dry weight between the irrigation systems, at all three irrigation frequencies, when plants were grown in BSS, MM, or SYT. However, for all four substrates and at all three irrigation frequencies, areca palm shoot dry weight was greater in overhead watered pots than in subirrigated pots. The final substrate electrical conductivity (EC) in all four subirrigated palm substrates was more than double the concentrations in overhead watered palm substrates. In this study, largest pentas, crossandra, and philodendron plants were grown in pots filled with PM and subirrigated daily, while largest areca palm plants were grown in pots filled with MM or SYT and watered overhead daily.
Robert H. Stamps, Seenivasan Natarajan, Lawrence R. Parsons and Jianjun Chen
same polyethylene film used in the ORM-heated shadehouse. Among-plants fog 2 details. This 206 m × 139 m × 3.3-m shadehouse was located in Wauchula, FL, and was filled with chamaedoreas, ctenanthes, dracaenas, jungle drum “palm” ( Carludovica ‘Jungle
Alan W. Meerow
Growth of Ravenea rivularis Jumelle and Perrier (majesty palm) and `Lady Jane' Anthurium Schott was compared in container media, using as a primary organic component sphagnum peat, sedge peat, or coir dust. Growth index and shoot and root dry weights of majesty palm were significantly higher in the coir than the sedge peat medium. Growth index and shoot dry weight were only marginally higher for the anthurium in the coir vs. sedge peat medium, and root dry weights were comparable. Both crops grew equally well in the coir and the sphagnum peat medium. The sedge peat medium had the most air porosity and the least water-holding capacity of the three media at the initiation of the trials, but at termination showed a reversal of these parameters. The coir medium showed the least change in these parameters over 8 months. High-quality coir dust appears to be an acceptable substitute for sphagnum or sedge peat in soilless container media.
Asad Tavakkoli and Enayat Tafazoli
Hand pollinated pistilate date palm flowers were removed 2, 6, 10, 16, 20 hours after pollination, fixed. cleared with 8N NaOH and stained with aniline blue. The Fluoresced pollen tubes were abserved under ultra violet microscope. It was noted that under natural conditions with mean temperature of 19C pollen tube reached the ovary after 16 hours.
Viability test of fresh and stored pollen grains using Brewbaker & Kwack's media at room temperature was 85 and 52.5%. respectively.
Timothy K. Broschat
Downy jasmines [Jasminum multiflorum (Burm. f.) Andr.] and areca palms [Dypsis lutescens (H. Wendl.) Beentje & J. Dransf.] were grown in containers filled with a fine sand soil (SS) or with a pine bark-based potting substrate (PS). Each of these substrates was amended with 0%, 10%, or 20% clinoptilolitic zeolite (CZ) by volume. Plants were fertilized monthly with a water-nonsoluble 20N-4.3P-16.6K granular fertilizer. Downy jasmines were larger and had darker color in CZ-amended PS and were larger in CZ-amended SS than in nonamended SS or PS. Areca palms, which tend to be limited by K in SS had better color and larger size when the SS was amended with CZ. In PS, where K is seldom limiting, areca palms did not respond to CZ amendment of the PS. Both ammonium (NH4)-N and potassium (K) were retained against leaching by CZ, but some of the NH4-N adsorbed to CZ was subject to nitrification, either before or after its release into the soil solution. Some phosphate (PO4)-P was also retained by CZ.
George E. Fitzpatrick and Wagner A. Vendrame
One of the largest horticultural trade shows in the United States, the Tropical Plant Industry Exhibition, takes place each January in Fort Lauderdale, Fla. The timing of this show coincides with the offering, during the spring semester, of an undergraduate horticulture course, Palm Production and Culture (ORH 4321C, 3 credits). We have developed a guided activity in which we assign the students to visit several preselected exhibits in this show, so that each exhibit in the show is visited by at least one student. The students complete a questionnaire for each exhibit in which they note the identity of the palm species present, the number of species present, the number of individuals of each species, and the total number of palms in each exhibit. Data in the questionnaires are compiled and used to augment and reinforce class discussions on morphology, cultural requirements, interiorscape management, species richness, species diversity, and field laboratory work in morphology and taxonomy. Procedures used have the potential for adaptation to other types of horticultural trade shows and other types of horticultural crops, as well as for other courses in horticulture.