Growth variations and stability analyses of seven poplar clones at three sites in northeast China
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ORIGINAL PAPER
Growth variations and stability analyses of seven poplar clones at three sites in northeast China Xiaona Pei1,2 · Luping Jiang3 · Ammar khalil Mohamed Ahmed4 · Hongying Yu1,2 · Rizheng Chong1,2 · Xiangling You3 · Xiyang Zhao3
Received: 12 April 2020 / Accepted: 13 July 2020 © Northeast Forestry University 2020
Abstract Growth characteristics have complex inheritance patterns and genotype (G) by environment (E) interaction make predicting tree response to environmental changes difficult. In this study, the growth of seven poplar clones at three different sites was taken as the research focus, and heights and basal diameters were investigated in the second growing season. An ANOVA showed that all main effects, site, clone number and their interactions were highly significant in the overall F-tests. The coefficients of variation and repeatability of different traits ranged from 15.5 to 43.9% and from 0.549 to 0.912, respectively. AMMI (Additive Main Effects and Multiplicative Interaction) analysis results showed that genotype, environment and G × E interaction were significantly highly correlated. The stability analysis indicated that different clones showed different growth traits on different sites, which suggests that elite clones should be selected separately for different sites. Based on the growth Xiaona Pei, Luping Jiang, and Ammar khalil Mohamed Ahmed contributed equally to this work. Project funding: This work was supported by the National Key Research and Development Program of China (Grant No. 2016YFD0600404) and the Fundamental Research Funds for the Central Universities (Grant No. 2572017DA02). The online version is available at http://www.springerlink.com. Corresponding editor: Yanbo Hu.
traits, under a 10% selection rate, three clones were selected for different sites and the genetic gains of growth traits ranged from 4.7 to 11.2%. The three selected clones could be used to establish plantations in the future in different sites. Keywords Poplar · Hybrid clone · Genotype · Environmental interaction · Stability · Repeatability
Introduction Estimating growth and productivity of different sites is a central element of tree breeding and subsequent forest management (Berrill and O’Hara 2014). These estimates provide information for the potential production of biomass under different management prescriptions (Duan et al. 2018). Productivity is dependent on site conditions such as the environment and soil (Duan et al. 2018). Poplar (Populus spp.) plantations in favorable environments can produce large amounts of biomass in a relatively short time, maintaining their yield capacity over many years (Makeschin 1999; Hu et al. 2019). However, productivity varies greatly in the first rotation on different sites (Facciotto et al. 2005). This wide variability in productivity suggests that the importance of genetic characteristics of the planting material, such as site characteristics that affect growth under local climate and soils, has been underestimated (Bergante et al. 2010). Therefore,
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