Genetic control of coppice and lignotuber development in Eucalyptus globulus

2003 ◽  
Vol 51 (1) ◽  
pp. 57 ◽  
Author(s):  
S. P. Whittock ◽  
L. A. Apiolaza ◽  
C. M. Kelly ◽  
B. M. Potts
Keyword(s):  
Genetic Diversity ◽  
Tree Growth ◽  
Artificial Selection ◽  
Eucalyptus Globulus ◽  
Cotyledonary Node ◽  
Subsequent Growth ◽  
Seedling Traits ◽  
Short Rotation ◽  
Vigorous Growth ◽  
Number Of Stems

The economics of short-rotation pulpwood plantations of Eucalyptus globulus as a coppice crop are influenced by stump survival and subsequent coppice growth rates. This study revealed significant genetic diversity in coppicing traits, both within and between subraces, following felling in a progeny trial after 9 years of growth. A total of 67% of trees coppiced after 14 months, but subraces varied from 43 to 73%. Heritabilities for coppice success (0.07) and subsequent growth (0.16–0.17) were low but statistically significant. Strong genetic correlation between presence/absence of coppice, the number of stems coppicing from the stump and modal coppice height, indicate that selection is possible by using the binary trait. The ability of a tree to coppice was genetically correlated with tree growth prior to felling (rg = 0.61) and with nursery-grown seedling traits, where large genetic differences were observed in the development of lignotubers. Coppicing was genetically correlated with the number of nodes with lignotubers (rg = 0.66) and seedling stem diameter at the cotyledonary node (rg = 0.91). These traits were uncorrelated with later age growth and with each other. The results suggest that coppicing is influenced by three independent mechanisms—lignotuber development, enlargement of the seedling stem at the cotyledonary node and vigorous growth—which enhance ability to survive catastrophic damage, and indicate that both lignotuber and coppice development can be altered by both natural and artificial selection.

Impact of Teratosphaeria nubilosa over tree growth and survival of Eucalyptus globulus and Eucalyptus maidenii in Uruguay

New Forests ◽  
2016 ◽  
Vol 47 (6) ◽  
pp. 829-843 ◽  
Author(s):  
Gustavo Balmelli ◽  
Sofía Simeto ◽  
Diego Torres ◽  
Andrés Hirigoyen ◽  
Alicia Castillo ◽  
...  
Keyword(s):  
Tree Growth ◽  
Eucalyptus Globulus ◽  
Growth And Survival

scholarly journals Biomass Losses Caused by Teratosphaeria Leaf Disease in Eucalyptus globulus Short Rotation Forestry

Forests ◽  
2017 ◽  
Vol 8 (11) ◽  
pp. 447 ◽  
Author(s):  
Severiano Pérez ◽  
Carlos Renedo ◽  
Alfredo Ortiz ◽  
Félix Ortiz ◽  
Agustín Santisteban
Keyword(s):  
Eucalyptus Globulus ◽  
Leaf Disease ◽  
Short Rotation

WITHIN AND BETWEEN-TREE VARIATION OF BARK CONTENT AND WOOD DENSITY OF EUCALYPTUS GLOBULUS IN COMMERCIAL PLANTATIONS

IAWA Journal ◽  
2001 ◽  
Vol 22 (3) ◽  
pp. 255-265 ◽  
Author(s):  
Teresa Quilhó ◽  
Helena Pereira
Keyword(s):  
Wood Density ◽  
Tree Growth ◽  
Eucalyptus Globulus ◽  
Basic Density ◽  
Dry Weight ◽  
Bark Thickness ◽  
Reasonable Accuracy ◽  
Wood Basic Density ◽  
Breast Height ◽  
Coefficients Of Variation

Eucalyptus globulus trees, 15 years old, were sampled at different heights from commercial pulpwood plantations in two sites in Portugal. Bark thickness was higher in the site with better growth and always decreased from the tree base to the top. Bark content was site independent and on average 11% of stem dry weight, higher at the base and top, and lower at 35% height level.Tree mean wood basic density averaged 600 kg /m3 and 568 kg /m3 for best and worst site, respectively, and was not correlated with tree growth. Wood density increased from base to top of the tree. Between-tree variation was low with coefficients of variation of site mean below 10%. Bark density (374 kg /m3 and 454 kg /m3 for best and worst site, respectively) did not show significant within tree variation. Average tree wood density could not be predicted with reasonable accuracy using a breast height sampling and better results were obtained using a sampling as a percentage of total height (e.g. 15%).

scholarly journals The effects of artificial selection on genetic variation of some immune genes in <i>Gallus gallus</i>

2013 ◽  
Vol 56 (1) ◽  
pp. 691-699
Author(s):  
T. Zhang ◽  
N. Zhao ◽  
Q. Liu
Keyword(s):  
Genetic Diversity ◽  
Artificial Selection ◽  
Nucleotide Diversity ◽  
Gene Evolution ◽  
Gallus Gallus ◽  
Immune Gene ◽  
Selection Efficiency ◽  
Data Set ◽  
Immune Genes ◽  
Minimum Number

Abstract. To research effects of the artificial selection of Gallus gallus on G. domesticus' nucleotide diversity of immune genes, sequence polymorphisms of G. domesticus (23 genes), G. gallus (23 genes), G. lafayetti (17 genes), and G. sonneratii (17 genes) were obtained from GenBank. The data set included 819 polymorphisms. Immune gene polymorphism and selection efficiency in the data from those four species of Gallus were calculated. By calculating the qw (Watterson's estimator) of each site, an average qw for each species and the minimum number of re-combinations in each species and by estimating the selection efficiency for G. domesticus and G. gallus, neither significant nucleotide diversity nor genetic-diversity-qw- difference was found between G. domesticus and G. gallus. The results indicated that the patterns of genetic diversity in G. domesticus were strongly influenced by recombination and, because Tajima's D has a negative value, recombination was the main mechanism responsible for the immune gene evolution of G. gallus.

Genetic control of Eucalyptus globulus harvest traits

2015 ◽  
Vol 45 (6) ◽  
pp. 615-624 ◽  
Author(s):  
Matthew G. Hamilton ◽  
Mauricio Acuna ◽  
John C. Wiedemann ◽  
Rick Mitchell ◽  
David J. Pilbeam ◽  
...  
Keyword(s):  
Genetic Variation ◽  
Eucalyptus Globulus ◽  
Genetic Correlations ◽  
Basal Area ◽  
Field Trials ◽  
Slight Reduction ◽  
Growth And Survival ◽  
Short Rotation ◽  
Stem Straightness ◽  
Tree Genetics

The cost of harvesting short-rotation plantation eucalypts can be in excess of AU$2500·ha−1. Despite this high cost, the extent to which harvesting productivity is affected by tree genetics is not well understood. We address this issue in a study of two 10-year-old genetic field trials of Eucalyptus globulus Labill. in Australia. Standing-tree traits analysed were survival, diameter at breast height, basal area, and stem straightness and forking. Harvest traits analysed were volume, time, and productivity. Genetic group and within-group genetic variation (additive and dominance), stand-level family variation, phenotypic and genetic correlations, and the effects of inbreeding were estimated for these traits. The different scenarios studied showed that plantation harvest productivity was affected by tree genetics to some degree but was mainly affected through positive covariation with stem diameter. Harvest productivity is thus unlikely to have been adversely affected by past selection. Although no significant additive or dominance genetic variation in stem forking or straightness was detected, weak phenotypic correlations were consistent with harvest productivity being higher in straighter trees with no forking. High inbreeding depression was evident for growth and survival; however, in open-pollinated progeny, this resulted in only a slight reduction in harvest productivity (5.5%) compared with out-crossed progeny.

Influence of previous frost damage on tree growth and insect herbivory of Eucalyptus globulus globulus

2001 ◽  
Vol 26 (5) ◽  
pp. 489-499 ◽  
Author(s):  
Vivien P. Thomson ◽  
Adrienne B. Nicotra ◽  
Martin J. Steinbauer
Keyword(s):  
Tree Growth ◽  
Eucalyptus Globulus ◽  
Insect Herbivory ◽  
Frost Damage

Growth responses to thinning and pruning in Eucalyptus globulus, Eucalyptus nitens, and Eucalyptus grandis plantations in southeastern Australia

2012 ◽  
Vol 42 (1) ◽  
pp. 75-87 ◽  
Author(s):  
David I. Forrester ◽  
Thomas G. Baker
Keyword(s):  
Tree Growth ◽  
Eucalyptus Globulus ◽  
Eucalyptus Grandis ◽  
Eucalyptus Nitens ◽  
Growth Responses ◽  
Southeastern Australia ◽  
Crown Length

Growth responses to pruning or thinning are well documented but their interactions are not, even though they are sometimes performed simultaneously. Growth responses to thinning and pruning were examined in nine plantation silvicultural experiments at five sites in southeastern mainland Australia. The species studied were Eucalyptus globulus Labill., Eucalyptus nitens (Deane and Maiden) Maiden, and Eucalyptus grandis Hill ex Maiden. Thinning from about 1100–1300 trees·ha–1 to about 300 or 500 trees·ha–1 at either age 3–4 years or 7–10 years increased the volume of sawlog crop trees in all species. Multiple lift pruning to 6.5 m height on the sawlog crop trees that retained at least 70% of the live crown length at any lift significantly reduced tree growth at only one of the six site–species combinations where both thinning and pruning were studied. And here, thinning interacted with pruning such that the pruning effects were not significant in unthinned stands because only shaded and inefficient foliage was removed. This study shows that thinning and pruning can interact to influence sawlog crop tree growth and this interaction is influenced by site.

scholarly journals New Clone of Sesenduk (FRIMsrp001)

2021 ◽  
Vol 3 (1) ◽  
pp. 135-138
Author(s):  
Khairul Masseat ◽  
Mohd Noor Mahat ◽  
Izran Kamal ◽  
Abdul Hamid Saleh ◽  
Yanti Abdul Kadir
Keyword(s):  
Selection Process ◽  
Physical And Mechanical Properties ◽  
Glass Container ◽  
Botanical Garden ◽  
Raw Material ◽  
Indigenous Species ◽  
Short Rotation ◽  
Breeding Attempt ◽  
Vigorous Growth ◽  
White Colour

The clone was produced from a breeding attempt on pioneer indigenous species of Endospermum diadenum. Seeds from the tree were collected and then were propagate and germinated in FRIM’s nursery. The selection process continued for the progeny which has possessed vigorous growth among others. A bud from the plant was successfully tissue-cultured, which multiplied and developed roots in glass container. The clone was planted in year 1996 at Kepong Botanical Garden (FRIM’s KBG) and Kampung Jawa plantation plots in FRIM. The seedlings of the clone were able to grow and survive at open site. Several trees of the planted clone from these areas have been cut for timber testing for its basic properties as well as for product development. The wood of the clone trees possessed good physical and mechanical properties and acceptable wood colour (yellow to white colour). The trees were able to achieve 30cm in diameter and 24m in height of straight bole in 10 years after planting provided that the soil at the plantation site is well-nurtured. Short rotation of planting, practiced for the clone is suitable for forest plantation and sustainable supply of raw material either for solid furniture industry or wood-based industry.

scholarly journals Artificial selection with traditional or genomic relationships: consequences in coancestry and genetic diversity

2015 ◽  
Vol 6 ◽  
Author(s):  
Silvia Teresa Rodríguez-Ramilo ◽  
Luis Alberto García-Cortés ◽  
María Ángeles Rodríguez de Cara
Keyword(s):  
Genetic Diversity ◽  
Artificial Selection ◽  
Genomic Relationships
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