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Judy Harrington and Scott Reid

Distichlis spicata var. stricta (Torrey) Beetle is a native grass that tolerates salt, high pH, and some heavy metals. It has been proposed for use in several challenging environments, including mine spoils and salt-impacted areas of golf courses, but its widespread use has been hindered by several factors, one of which is seed dormancy. Dormancy appears to be coat-imposed and can be overcome by scarification in relatively young seed lots. Thirteen-year-old seeds germinated better without scarification. Seeds were tested at several constant and alternating temperatures. Temperatures around 30 °C seemed to give the highest percentage germination, approaching the viability that was shown by tetrazolium chloride tests for each seed lot. Alternating temperatures increased the germination of unscarified seeds but not as much as scarification did. Light appears to be unnecessary for germination.

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Edward W. Bush, Paul Wilson, Dennis P. Shepard, and Gloria McClure

Priming or presoaking seed of common carpetgrass (Axonopus affinis Chase) and centipedegrass [Eremochloa ophiuroides Munro. (Kunz)] increased germination percentage and decreased mean time of germination (MTG) at 20, 25, and 30 °C. The effect of presoaking and priming was dependent on grass species and temperature. The optimum seed germination temperature for both of these warm-season species was 30 °C. Maximum effect on common carpetgrass or centipedegrass seeds was achieved by priming in 2% KNO3; higher concentrations did not improve germination percentage or MTG, and 4% was in some cases detrimental. Germination was higher and MTG lower at 20 and 30 °C than at 15 °C. Presoaking common carpetgrass and centipedegrass seeds was the most efficient seed enhancement treatment for germination at 30 °C.

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Konstantinos F. Bertsouklis and Maria Papafotiou

; Mostafa et al., 2010 ). In the horticultural and forestry practice, the plants are propagated mainly by seed. However, there is rather confusing information concerning the ecophysiology of Arbutus sp. seed germination. Mesléard and Lepart (1991

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Bob Maloney

The successful germination of triploid watermelon seeds depends largely upon three factors; moisture control, planting depth, and temperature control. The planting medium must be moistened until it is humid, but not wet enough for free water to be squeezed from a handful. This level of humidity must be maintained until germination is complete. The planting depth should be 1.25 to 2.5 cm. This reduces the number of seeds that “push” themselves from the medium and also facilitates correct moisture maintenance. Seeded trays should be placed in a germination room and held 48–72 hours at a temperature of 30 to 32 °C and a relative humidity of 90% to 95% until germination begins. When germination is complete, the plants can be watered normally.

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Orville C. Baldos, Joseph DeFrank, and Glenn S. Sakamoto

communication). A major hindrance to the immediate and large-scale use of tanglehead is its seed dormancy. Freshly harvested seeds exhibit poor to no germination. To remove dormancy and improve seed germination, an after-ripening period (i.e., dry storage) of 6

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Angela M. Madeiras, Thomas H. Boyle, and Wesley R. Autio

( Milstein, 2005 ). Phlox pilosa is potentially useful in these situations. This species is found in all states from North Dakota to Texas and eastward into Florida and New York ( Barkley, 1986 ). Germination of P. pilosa seeds is erratic ( Specialty

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Carol C. Baskin and Jerry M. Baskin

Five kinds (classes) of seed dormancy are known: physiological (PD), morphological (MD), morphophysiological (MPD), physical (PY), and combinational (PY+PD). PD is the most common class in the major vegetation zones of the world followed by PY, MPD, MD, and (PY+PD). Each class is described, and a dichotomous key to identify them is presented. The environmental conditions required to break PD, MD, MPD, PY, and (PY + PD) and promote germination are discussed. To help determine which treatments to use for breaking dormancy in seeds with water-permeable seedcoats (PD, MD, MPD), a “move-along experiment” is recommended. Little or no convincing evidence for the role of microbes or mechanical abrasion by soil particles in breaking PY can be found in the literature. However, there is good evidence that the water plug or gap in the seed or fruit coat of seeds with PY responds to environmental cues that permit timing of imbibition and germination to be well controlled in nature. Seeds of many species remain viable after passing through the digestive tracts of animals, with varying effects on germination.

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Mohamad-Hossein Sheikh-Mohamadi, Nematollah Etemadi, Ali Nikbakht, Mostafa Farajpour, Mostafa Arab, and Mohammad Mahdi Majidi

becoming a main environmental factor limiting seed germination and seedling growth in arid and semiarid regions ( Sekmen et al., 2012 ). Different levels of salinity stress can affect turfgrass adversely. These may include a series of morphological

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Roel Rabara, Samuel Contreras, David Tay, Mark A. Bennett, and Miller B. McDonald

Poster Session 34—Seed and Stand Establishment 30 July 2006, 12:00–12:45 p.m.

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Jacob S. Bravo, Thomas Okada Green, James R. Crum, John N. Rogers III, Sasha Kravchenko, and Charles A. Silcox

previous research with dazomet was conducted based on the product’s initial label, which was focused more on production agriculture fields. The goal of current research is to optimize weed seed germination control when dazomet is used as per the current