Báo cáo khao học: "Genetic trends in wood density and radial growth with cambial age in a radiata pine progeny test" ppt

... wood density and radial growth with cambial age in a radiata pine progeny test Francisco Zamudio a* , Ricardo Baettyg a , Adriana Vergara a , Fernando Guerra a and Philippe Rozenberg b a Facultad ... density and radial growth with cambial age. 2. MATERIALS AND METHODS 2.1. Progeny test description Data came from a progeny test of ra...

Ngày tải lên: 08/08/2014, 14:20

... heritability values. Identical results were obtained by Vargas-Hernandez and Adams [40, 41] with Pseudotsuga menziesii, but Zhang and Morgenstern [48] and Zhang and Jiang [49] demonstrated that in ... as well as in South Africa, New Zealand and Australia, where it was introduced between 1940–1950. According to Hopkins and Butcher [23], in Western Australia alone, 30 000 ha...

Ngày tải lên: 08/08/2014, 14:20

... which reaction marks a better adaptation to water deficit. In what way are latewood-like cells more adapted to water deficit than earlywood-like cells? A latewood-like cell is a cell with a narrow ... tension strains due to tangential shrinkage that have exceeded fracture limits of wood. Internal cracks are at the same time an important wood qual - ity defect, and a geneti...

Ngày tải lên: 08/08/2014, 14:20

... trees. 2.3. Statistical analysis The following measured and derived characters were included in the statistical analyses: (GA_), grain angle of individual rings in the interval of annual ring numbers ... study, it was possible to analyse grain angle with respect to both cambial age and chronological year. The heritabilities for grain angle of individual rings were similar in b...

Ngày tải lên: 08/08/2014, 14:20

... explaining ring density (D): ring width (W), ring cambial age (CA) and genetic identity (provenance P, family F, clone C). In one case (half-sib progeny) , an additional geographical variable was ... A genetic effect may affect the significance level of a model in at least two ways: either as a main factor, as in analysis of vari- ance (ANOVA), or within an interaction te...

Ngày tải lên: 08/08/2014, 14:21

... covariance between ED and EA was negative at age 2 and positive between ages 3 and 7, which is mainly juve- nile wood (Fig. 6B). This covariance decreased with cambial age after ring 5 and was ... juvenile wood within the stem will increase. In New Zealand, the real- ized genetic gain in stem straightness and stem diameter growth in radiata pine has already p...

Ngày tải lên: 08/08/2014, 00:21

... with a 6, 10 and 13 cambial age. The Average Ring Density is more dependent on the Earlywood components, mainly on Earlywood Density, than Latewood ones. Among all the components analysed, Earlywood ... it has been introduced, such as South Africa, New Zealand and Australia . As an example, in South Africa its position is special with more than 325000 ha [51] because it is p...

Ngày tải lên: 08/08/2014, 01:21

... length Basic density and gradient Microfibril angle Strength and stiffness Dimensional stability Shrinkage and collapse Tension wood Knot size Incidence of decay, spiral grain and end splits Basic density Lignin ... potential assessment (adapted from [15]). Change with age Minimum age Basic density Increase 3 Density variation Constant 5 Microfibril angle Decrease 5 Pu...

Ngày tải lên: 08/08/2014, 14:20

... the diseased animal. They occurred early in lactation, between lambing and the second month of lactation, and on average on day 32 after lambing (Tab. II). Chronic mastitis was detected by mammary palpation ... resistance and milk somatic cell score in French Lacaune dairy sheep Francis B ARILLET a, ∗ , Rachel R UPP b , Sandrine M IGNON -G RASTEAU a, c , Jean-Michel A STRUC d ,...

Ngày tải lên: 09/08/2014, 18:21

... criteria relating to daily characteristics: average feed intake per day (kg), average total eating time per day (min) defined as the total duration of all visits made on ... were larger for average daily gain and food conversion ratio. The two traits predicting carcass lean to fat ratio, ie, live backfat thickness in boars and carcass lean...

Ngày tải lên: 09/08/2014, 18:22