scholarly journals Effect of Initial Planting Density on Growth Traits and Wood Properties of Triploid Chinese White Poplar (Populus tometosa) Plantation

Forests ◽  
2021 ◽  
Vol 12 (12) ◽  
pp. 1676
Author(s):  
Yaru Sang ◽  
Peng Gao ◽  
Xiangyang Kang ◽  
Pingdong Zhang
Keyword(s):  
Fiber Length ◽  
Growth Traits ◽  
Wood Properties ◽  
Planting Density ◽  
Stem Volume ◽  
Triploid Hybrid ◽  
White Poplar ◽  
Chinese White ◽  
Hybrid Clones ◽  
Chinese White Poplar

Planting density primarily affects the yield and wood quality of plantations. There are multiple reports on the effects of planting density on growth traits and wood properties in young triploid Chinese white poplar (Populus tomentosa) plantations. Nevertheless, assessment of the effects of initial planting density is lacking for plantations older than ten years. Here, an 11-year-old plant density trial (2490, 1665, 1110, 832, 624, 499, and 416 trees/hm2) established with four hybrid clones (S86, B301, B331 and 1316) in northern China was used to determine the effect of initial planting density on growth traits (diameter at breast height (DBH), tree height (H), stem volume (SV) and stand wood volume (SWV)), basic wood density (BWD), and fiber properties (fiber length (FL), fiber width (FW), and the ratio of fiber length to width (FL/FW)). A total of 84 trees from four clones were sampled. In this study, the initial planting density had a highly significant effect on growth traits (p < 0.001) and had a moderate effect on FL. Overall, the reduction in initial planting density led to the increase in DBH, H, SV, and FL/FW. Triploid hybrid clones planted at 416 trees/hm2 had the largest DBH, H, SV, FL/FW and the smallest SWV and FW. Clonal effects were also significant (p < 0.05) for all studied traits except for FL. Clone S86 had a higher growth rate and the largest BWD and FW. Clones–initial planting densities interaction was insignificant for all growth traits and wood properties. A weak and positive estimated correlation between BWD and growth traits (H, SV, SWV) within each planting density was seen. Our results demonstrate that an appropriate reduction in initial density in triploid Chinese white poplar plantations with long rotation is a suitable strategy to promote tree growth and retain excellent wood processing characteristics.

scholarly journals Genotype-environment interaction and stability of fiber properties and growth traits in triploid hybrid clones of Populus tomentosa

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Jian Wu ◽  
Qing Zhou ◽  
Yaru Sang ◽  
Xiangyang Kang ◽  
Pingdong Zhang
Keyword(s):  
Fiber Length ◽  
Growth Traits ◽  
Accurate Estimation ◽  
Triploid Hybrid ◽  
Stability Parameters ◽  
Fiber Properties ◽  
Quantitative Parameters ◽  
Clonal Testing ◽  
Triploid Hybrid Clones ◽  
Hybrid Clones

Abstract Background Clones provide a sensitive method for evaluating genotypic stability and detecting genotype-environment (G × E) interactions because of non-additive genetic effects among clones and there being no genetic effect among ramets of an ortet. With this study, we aimed to confirm and expand earlier findings, estimate stability parameters, and provide accurate estimates of clonal repeatabilities and genetic gains for a triploid breeding program of P. tomentosa Carr. Results Six 5-year-old clonal trials established in Northern China were used to determine the clonal variation, clone × site interactions, and the stability parameters of fiber properties of wood and growth traits. 360 trees from ten hybrid clones were collected from six sites. The clonal and site effects had a highly significant effect (P < 0.001) for all studied traits. While the clone × site interactions had a highly significant effect (P < 0.001) on fiber length (FL), coarseness (C), and tree growth (tree height [H], diameter at breast height [DBH] and stem volume [SV]), and a moderate effect (P < 0.05) on fiber width (FW) and fiber length/width (FL/W). For FL and SV, most of the triploid hybrid clones had higher reaction norms to the improvement in growth conditions and higher phenotypic plasticity. The estimated clonal repeatability of FW (0.93) was slightly higher than for FL (0.89), FL/W (0.83), C (0.91), DBH (0.76), H (0.85), and SV (0.80). Three clonal testing sites were sufficient to estimate quantitative parameters of fiber properties, however, more clonal testing sites would help improve the accuracy of quantitative parameters of the growth traits. Conclusions Our results highlight that accurate estimation of quantitative parameters for growth traits in triploid hybrid clones of P. tomentosa requires more clonal testing sites than the fiber properties.

scholarly journals Genotype-Environment Interaction and Stability of Fiber Properties and Growth Traits in Triploid Hybrid Clones of Populus Tomentosa

2020 ◽  
Author(s):  
Jian Wu ◽  
Qing Zhou ◽  
Yaru Sang ◽  
Xiangyang Kang ◽  
Pingdong Zhang
Keyword(s):  
Fiber Length ◽  
Growth Traits ◽  
Populus Tomentosa ◽  
Triploid Hybrid ◽  
Stability Parameters ◽  
Fiber Properties ◽  
Quantitative Parameters ◽  
Clonal Testing ◽  
Triploid Hybrid Clones ◽  
Hybrid Clones

Abstract Background: Clones provide a sensitive method for evaluating genotypic stability and detecting genotype-environment (G × E) interactions because of non-additive genetic effects among clones and no genetic effect among ramets of an ortet. The experiments aimed at confirming and expanding the earlier findings, estimating stability parameters, and providing accurate estimates of clonal repeatabilities and genetic gains for an triploid breeding programme of Populus tomentosa Carr. Results: Six 5-year-old clonal trials established in Northern China were used to determine the clonal variation, clone × site interactions and the stability parameters of fiber properties of wood and growth traits. Three hundred sixty trees from ten hybrid clones were collected in the six sites. The clonal and site effects had a highly significant effect (P < 0.001) for all studied traits. The clone × site interactions had a highly significant effect (P < 0.001) on fiber length (FL), coarseness (C), and tree growth (tree height [H], diameter at breast height [DBH] and stem volume [SV]), and a moderate effect (P < 0.05) on fiber width (FW) and fiber length/width (FL/W). For FL and SV, most of the triploid hybrid clones had higher reaction norms to the improvement in growth conditions and higher phenotypic plasticity. The estimated clonal repeatability of FW (0.93) was slightly higher than for FL (0.89), FL/W (0.83), C (0.91), DBH (0.76), H (0.85), and SV (0.80). Three clonal testing sites were sufficient to estimate quantitative parameters of fiber properties. However, more than three clonal testing sites will help improve the accuracy of quantitative parameters of growth traits.Conclusions: Our results unraveled that accurate estimation of quantitative parameters for growth traits in triploid hybrid clones of Populus tomentosa required more clonal testing sites than fiber properties.

A comparative study of the stomata and PM2.5particles on the leaf surface of Chinese white poplar (Populus tomentosa Carr.) in different polluted places

2015 ◽  
Vol 35 (22) ◽  
Author(s):  
石婕 SHI Jie ◽  
刘庆倩 LIU Qingqian ◽  
安海龙 AN Hailong ◽  
曹学慧 CAO Xuehui ◽  
刘超 LIU Chao ◽  
...  
Keyword(s):  
Comparative Study ◽  
Leaf Surface ◽  
Populus Tomentosa ◽  
White Poplar ◽  
Chinese White ◽  
Populus Tomentosa Carr ◽  
Chinese White Poplar

Insect-resistant mechanism of transgenic triploid of Chinese white poplar

2006 ◽  
Vol 1 (2) ◽  
pp. 196-200 ◽  
Author(s):  
Shengliang Yuan ◽  
Baojia Gao ◽  
Na Zhang
Keyword(s):  
White Poplar ◽  
Chinese White ◽  
Insect Resistant ◽  
Chinese White Poplar

Variation in growth, leaf, and wood property traits of Chinese white poplar (Populus tomentosa), a major industrial tree species in Northern China

2014 ◽  
Vol 44 (4) ◽  
pp. 326-339 ◽  
Author(s):  
Qingzhang Du ◽  
Baohua Xu ◽  
Chenrui Gong ◽  
Xiaohui Yang ◽  
Wei Pan ◽  
...  
Keyword(s):  
Phenotypic Variation ◽  
Northern China ◽  
Populus Tomentosa ◽  
Phenotypic Traits ◽  
Genome Wide Association Studies ◽  
White Poplar ◽  
Chinese White ◽  
Starting Point ◽  
Populus Tomentosa Carr ◽  
Chinese White Poplar

The natural phenotypic variation in Chinese white poplar (Populus tomentosa Carr.), which is distributed across a wide geographical area of northern China (30°N–40°N, 105°E–125°E), is a potential source of beneficial variation for poplar breeding. Thirteen traits related to growth, leaf, and wood properties were quantified in 460 P. tomentosa individuals grown in a common garden plot. There was considerable range-wide phenotypic variation in all traits across individuals according to the patterns of ANOVA among hierarchical groups (populations and regions, respectively). A clear sexual dimorphism for seven traits was examined. In total, 32 trait–trait phenotypic correlations (P ≤ 0.05), 10 trait–geographical factor correlations (P ≤ 0.05), and a highly interrelated structure network were identified, which was further supported by principal component analysis (PCA). These associations can be used in multiple-trait selective breeding programs for advantageous phenotypic traits. A hierarchical cluster analysis was used to classify four groups (southeastern, central, northeastern, and southwestern populations) among the natural populations using these 13 phenotypic traits. This study provides important perspectives into the use of direct breeding to potentially improve economic traits and provides a starting point for genome-wide association studies in P. tomentosa in the near future.

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