Apr 9, 2018

Genetic control of transition from juvenile to mature wood with respect to microfibril angle (MFA) in Norway spruce (Picea abies) and lodgepole pine (Pinus contorta)

BioRxiv : the Preprint Server for Biology
Haleh HayatgheibiMaria Rosario Garcia Gil

Abstract

Genetic control of microfibril angle (MFA) transition from juvenile to mature was evaluated in Norway spruce and lodgepole pine. Increment cores were collected at breast height from 5,618 trees in two 21 year old Norway spruce progeny trials in southern Sweden, and from 823 trees in two 34 to 35 year old lodgepole pine progeny trials in northern Sweden. Radial variations in MFA from pith to bark were measured for each core using SilviScan. To estimate MFA transition from juvenile to mature, a threshold level of MFA 20 degrees was considered and six different regression functions were fitted to the MFA profile of each tree after exclusion of outliers, following three steps. The narrow-sense heritability estimates obtained for MFA transition were highest based on the slope function, ranging from 0.21 to 0.23 for Norway spruce and from 0.34 to 0.53 for lodgepole pine, while heritabilities were mostly non significant based on the logistic function, under all exclusion methods. Results of this study indicate that it is possible to select for an earlier MFA transition from juvenile to mature in Norway spruce and lodgepole pine selective breeding programs, as the genetic gains obtained in direct selection of this trait were very high ...Continue Reading

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Mentioned in this Paper

Study
Selective Breeding
Trees (plant)
MFAP1 protein, human
Picea excelsa
ADRBK1 wt Allele
Breast
Angular
Pith - plant part
Microfibrils

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