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He Li and Donglin Zhang

. Unfortunately, seed germination of mountain laurel has been challenging for breeders. Mountain laurel seeds generally become fully mature in 5 months after fertilization ( Jaynes, 1988 ). Mature seeds only yield ≈30% to 40% of germination and often require up to

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Yung-I. Lee, Chia-Fu Lu, Mei-Chu Chung, Edward C. Yeung, and Nean Lee

Debergh, 1986a ), ultrasound ( Miyoshi and Mii, 1988 ), and chilling ( Chu and Mudge, 1994 ; Shimura and Koda, 2005 ). However, it is not clear whether the improvement in seed germination after various pretreatments is the result of a reduction in the

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Haiyan Zhang

to solve supply and demand, protect germplasm resource, and enrich genetic diversity of this species. Environmental factors such as light and temperature are known to affect seed germination in Asclepiadaceae family. Seeds of Calotropis procera and

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W. Roland Leatherwood, D. Mason Pharr, Lisa O. Dean, and John D. Williamson

concentration (to 40% and 5% at 50 and 100 m m NaCl, respectively) than Florida (to 60% and 25% at 50 and 100 m m NaCl, respectively). Fig. 1. Seed germination percentages of salt-tolerant species (‘Florida’ celery, ‘Ventura’ celery, and cabbage) and

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Michael W. Bairu, Manoj G. Kulkarni, Renée A. Street, Rofhiwa B. Mulaudzi, and Johannes Van Staden

-promoting substances, and watering frequencies on seed germination and seedling growth of A. ferox ; and 2) to assess the applicability of an in vitro propagation protocol developed for other Aloe spp. Materials and Methods Seed collection. Dried seeds of A. ferox

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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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Matthew D. Madsen, Michael A. Fidanza, Nicholas S. Barney, Stanley J. Kostka, Turmandakh Badrakh, and Mica F. McMillan

repellency within the seeds’ microsite ( Madsen et al., 2012 ). With hydrologic function restored around the seed, soil water infiltration, percolation, and retention is improved, which enhances seed germination and plant survival ( Moore et al., 2010

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Xiuli Shen and Myeong-Je Cho

contamination than using vegetative parts of plants. However, sugar pine seeds are difficult to germinate and are characterized by irregular germination from diverse sources ( Baron, 1978 ; Krugman, 1966 ). Seed germination is a complex process governed by

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Qi Zhang, Kevin Rue, and Jeanna Mueller

Plant growth and development is affected by various environmental stresses such as drought, salinity, and suboptimal temperatures. During the seed germination and seedling growth stages, plants are the most vulnerable to stresses ( Almansouri et al

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J. Ryan Stewart and Irene McGary

, ecosystems in which several congeners of new jersey tea are native, are dependent on fire for renewal and regeneration ( Keeley, 1991 ; McMillan Browse, 1994 ), which is reflected in the observation that seed germination of several ceanothus ( Ceanothus spp