By Prof. Dr. Bruce J. Zobel, Prof. Dr. Jackson B. Jett (auth.)

ISBN-10: 3642795145

ISBN-13: 9783642795145

ISBN-10: 3642795161

ISBN-13: 9783642795169

Over the previous years, greatly has been realized approximately edition in wooden prop­ erties. Genetic keep an eye on is an enormous resource of edition in so much wooden houses. wooden is managed genetically either at once within the developmental or inner seasoned­ cesses of wooden formation and not directly through the regulate of tree shape and progress styles. Emphasis during this booklet could be at the inner keep watch over of wooden construction by means of genetics even if there'll be chapters facing the oblique genetic keep an eye on of wooden, which used to be coated intimately within the past ebook via Zobel and van Buijtenen (1989). The literature at the genetics of wooden is particularly variable, SO'lle really superficial, on which little reliance might be put, and a few from well-designed and properly achieved study. whilst compatible, close to the tip of every bankruptcy, there'll be a precis with the authors' interpretation of crucial details within the bankruptcy. The literature at the genetics of wooden could be very debatable. this is often to be anticipated, considering that either the surroundings and its interplay with the genotype of the tree may have a huge impact on wooden houses, specifically whilst timber of comparable genotypes are grown less than extensively divergent stipulations. including to the confusion, experiences often were designed and analyzed rather another way, leading to conflicting checks of results.

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In fact, there is so much variation in properties like wood density that it is sometimes hard to believe. 85. Woods with such different densities in no way resemble each other and are not suitable for the same end uses even though they are from the same species. 75. 2. What causes the variation? As mentioned in Chapter 1, if the wood differs largely because of varied environmental conditions, a genetics program will not be warranted. For example, provenances within some species have greatly differing woods, but when the seeds of the provenances are planted on one site, the wood can be very similar by provenance source (Zobel and van Buijtenen 1989).

Controls Influencing Wood Development 33 The relative magnitude of variance components due to general combining ability and specific combining ability is the way to show the importance of additive and nonadditive genetic variances. General combining ability was found to be predominant in wood density, tracheid length, cell diameter, and moisture content for black spruce (Picea mariania) (Boyle et al. 1987). These respond well to selection, and this has been true for most species. However, characteristics such as cellulose yield have a low combining ability and cannot be easily improved by standard selection (Jett et al.

These respond well to selection, and this has been true for most species. However, characteristics such as cellulose yield have a low combining ability and cannot be easily improved by standard selection (Jett et al. 1977). b) For nonadditive variance, selection and crossing are not profitable and of little value, since the nonadditive variance is mostly dependent on gene and allele associations that occur randomly when different genotypes are crossed. The ways to use this nonadditive genetic variance are by vegetative propagation, in which both additive and nonadditive variance are transferred by means of the cutting from the donor parent to the new plant, or by making specific crosses that have shown the genetic combinations to produce the desired wood property.

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Genetics of Wood Production by Prof. Dr. Bruce J. Zobel, Prof. Dr. Jackson B. Jett (auth.)

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