title: Comparative analysis of growth and photosynthetic characteristics of (Populus simonii × P. nigra) × (P. nigra × P. simonii) hybrid clones of different ploidides.
abstract: To evaluate differences among poplar clones of various ploidies, 12 hybrid poplar clones (P. simonii × P. nigra) × (P. nigra × P. simonii) with different ploidies were used to study phenotypic variation in growth traits and photosynthetic characteristics. Analysis of variance showed remarkable differences for each of the investigated traits among these clones (P < 0.01). Coefficients of phenotypic variation (PCV) ranged from 2.38% to 56.71%, and repeatability ranged from 0.656 to 0.987. The Pn (photosynthetic rate) photosynthetic photon flux density (PPFD) curves of the 12 clones were S-shaped, but the Pn-ambient CO2 (Ca) curves were shaped like an inverted "V". The stomatal conductance (Gs)-PPFD and transpiration rate (Tr)-PPFD curves had an upward tendency; however, with increasing PFFD, the intercellular CO2 concentration (Ci)-PPFD curves had a downward tendency in all of the clones. The Pn-PPFD and Pn-Ca curves followed the pattern of a quadratic equation. The average light saturation point and light compensation point of the triploid clones were the highest and lowest, respectively, among the three types of clones. For Pn-Ca curves, diploid clones had a higher average CO2 saturation point and average CO2 compensation point compared with triploid and tetraploid clones. Correlation analyses indicated that all investigated traits were strongly correlated with each other. In future studies, molecular methods should be used to analyze poplar clones of different ploidies to improve our understanding of the growth and development mechanisms of polyploidy.
authors: State Key Laboratory of Tree Genetics and Breeding (Northeast Forestry University), Northeast Forestry University, Harbin, 150040, China; Seed Orchard of Siping, Siping, 136000, China.
authors: Xiyang
authors: X
authors: Zhao
authors: State Key Laboratory of Tree Genetics and Breeding (Northeast Forestry University), Northeast Forestry University, Harbin, 150040, China.
authors: Ying
authors: Y
authors: Li
authors: State Key Laboratory of Tree Genetics and Breeding (Northeast Forestry University), Northeast Forestry University, Harbin, 150040, China.
authors: Mi
authors: M
authors: Zheng
authors: State Key Laboratory of Tree Genetics and Breeding (Northeast Forestry University), Northeast Forestry University, Harbin, 150040, China.
authors: Xiuyan
authors: X
authors: Bian
authors: State Key Laboratory of Tree Genetics and Breeding (Northeast Forestry University), Northeast Forestry University, Harbin, 150040, China.
authors: Mengran
authors: M
authors: Liu
authors: State Key Laboratory of Tree Genetics and Breeding (Northeast Forestry University), Northeast Forestry University, Harbin, 150040, China.
authors: Yanshuang
authors: Y
authors: Sun
authors: State Key Laboratory of Tree Genetics and Breeding (Northeast Forestry University), Northeast Forestry University, Harbin, 150040, China.
authors: Jing
authors: J
authors: Jiang
authors: Tree Seedling Management Station, Forestry Department of Jilin Province, Changchun, 130000, China.
authors: Fuwei
authors: F
authors: Wang
authors: Tree Seedling Management Station, Forestry Department of Jilin Province, Changchun, 130000, China.
authors: Shuchun
authors: S
authors: Li
authors: Seed Orchard of Siping, Siping, 136000, China.
authors: Yonghong
authors: Y
authors: Cui
authors: State Key Laboratory of Tree Genetics and Breeding (Northeast Forestry University), Northeast Forestry University, Harbin, 150040, China.
authors: Guifeng
authors: G
authors: Liu
authors: State Key Laboratory of Tree Genetics and Breeding (Northeast Forestry University), Northeast Forestry University, Harbin, 150040, China.
authors: Chuanping
authors: C
authors: Yang
mesh_terms: D002734:Chlorophyll / Q000502:physiology; D005453:Fluorescence; D006824:Hybridization, Genetic; D008954:Models, Biological; D010788:Photosynthesis; D011003:Ploidies; D032107:Populus / Q000235:genetics / Q000254:growth & development* / Q000502:physiology*
chemical_list: D002734:Chlorophyll