Results 261 to 270 of about 4,087 (281)
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Biotechnology and Clonal Forestry
1993Traditionally, forests have been regenerated from seedlings derived from bulked seed collected in nature, or more recently from seeds collected from randomly pollinated plus-trees. In most of these forests there is a large variation in growth, form, and vigor. Besides, there are forest tree species that are characterized by poor and irregular seed set,
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Estimating genetic gains from alternative breeding strategies for clonal forestry
Canadian Journal of Forest Research, 1992Concepts and procedures are presented for the analysis of progeny trials that incorporate clonal replication as a means to resolve variance arising from nonadditive gene effects. Components of variance from the linear model may be expressed in terms of expected covariances among relatives, and these, in turn, may be used to derive approximations of ...
T.J. Mullin, Y.S. Park
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Comparison of Experimental Designs for Clonal Forestry Using Simulated Data
Forest Science, 2006Abstract Various alternatives for the design of clonal field trials in forestry were studied using simulated data to identify “optimal𠇍 or “near-optimal𠇍 scenarios for the estimation of genetic parameters. The simulated field site consisted of a rectangular grid on which 256 clones with 8 ramets each were installed.
Salvador A. Gezan +2 more
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Clonal Forestry with Yellow-Cedar
1993Stecklings have been the major propagule type for the reforestation of yellow-cedar [Chamaecyparis nootkatensis (D. Don) Spach] over the past 15 years in British Columbia. Over 70% of the planting stock since 1975 has been Stecklings, and currently, one-half to three-quarters of a million Stecklings are planted annually.
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Strategies for Clonal Forestry with Poplars, Aspens, and Willows
1993Poplars (species and interspecific hybrids of sections Aigeiros and Tacamahaca), aspens (Leuce poplars) and willows (Salix) exhibit a variety of useful morphological, anatomical, and physiological characteristics. Due to their fast growth and the fact that they may be planted on many and varied sites both in and out of forests, poplars, aspens, and ...
L. Zsuffa +3 more
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Conifer Somatic Embryogenesis and Clonal Forestry
1993Somatic embryogenesis, the formation and development of embryos from somatic (vegetative) tissues under in vitro conditions, was first demonstrated with carrot (Steward et al. 1958). The list of plants that can be regenerated by somatic embryogenesis continues to grow (Tisserat et al. 1979; Ammirato 1983; see references in this chapter).
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Strategies for Clonal Forestry with Norway Spruce
1993Norway spruce [Picea abies (L.) Karst.] is the most extensively used forest-tree species in Europe. Recently, increased interest in its use in northeastern USA and eastern Canada has been expressed; in some areas of this region, its growth and other qualities exceed the indigenous species (Fowler 1979).
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Clonal Forestry with Sugi (Cryptomeria japonica)
1993Since ancient times, sugi (Cryptomeria japonica D. Don) has been one of the most important conifer species in Japan. In the People’s Republic of China, descriptions of Cryptomeria foriunei Hooibrenk ex Otto et Dietr, are also found, however, it is not so popular in Chinese forestry (cf. Hashimoto 1983). In Taiwan, in 1896, the seeds of C. japonica were
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Policies, Regulations, and Laws Affecting Clonal Forestry
1993The task on regulation of forest reproductive material was initiated around 1925 in Germany and other Central European Countries. By that time the international seed trade was expanding and it was realized that there should be regulation to protect forest regeneration from unsuitable seed sources.
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Cryopreservation of Embryogenic Cultures of Conifers and Its Application to Clonal Forestry
1999Cryopreservation, by providing physico-chemical stability of germplasm, offers the potential for economically and reliably providing long-term storage of genetic resources (Blakesley et al. 1996). It has become a cornerstone of conifer somatic embryogenesis (Adams et al. 1994; Gupta et al. 1994, Smith et al. 1994, Handley et al.
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