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Interspecific Variation and Phylogenic Architecture of pinus densata and the Hybrid of pinus tabuliformis×pinus Yunnanensis in the pinus densata Habitat:an Electrical Impedance Spectra Perspective

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Journal of Botanical Research 2021年第1期3卷 1-15页

作者： Fengxiang Ma Xiaoyang Chen Yue Li School of Sciences Beijing Forestry UniversityBeijing 100083China College of Forestry and Landscape Architecture South China Agricultural UniversityGuangzhouGuangdong 510642China National Engineering Laboratory for Forest Tree Breeding Key Laboratory for Genetics and Breeding of Forest Trees and Ornamental Plants of Ministry of EducationBeijing Forestry UniversityBeijing 100083China

We evaluated a novel and non-destructive method of the electrical impedance spectroscopy(EIS)to elucidate the genetic and evolutionary relationship of homoploid hybrid conifer of pinus densata(P.d)and its parental species pinus tabuliformis(P.t)and pinus yunnanensis(P.y),as well as the artificial hybrids of the P.t and P.y.Field common garden tests of96 trees sampled from 760 seedlings and 480 EIS records of 1,440 needles assessed the interspecific variation of the P.d,P.t,P.y and the artificial hybrids.We found that(1)EIS at different frequencies diverged significantly among germplasms;P.y was the highest,P.t was the lowest,and their artificial hybrids were within the range of P.t and P.y;(2)maternal species effect of EIS magnitudes in the hybrids and P.d was stronger than the paternal species characteristics;(3)EIS of the artificial hybrid confirmed the mid-parent and partial maternal species characteristics;(4)unified exponential model of EIS for the interspecific and hybrids can be constructed as|Z|=Af^(-B);(5)cluster analysis for species and hybrid combinations in total corroborated with the previous hybrid model of pinus densata.Our non-destructive EIS method complemented the previous finding that pinus densata was originated from P.t and P.y.We conclude that the impedance would be a viable indicator to investigate the interspecific genetic variations of conifers.

关键词： pinus densata Artificial hybrid Electrical impedance Interspecific genetic variation Homoploid hybrid

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Capacitance Characteristics of pinus densata,pinus tabuliformis,pinus yunnanensis and the hybrids pinus tabuliformis×pinus Yunnanensis

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Journal of Botanical Research 2020年第3期2卷 41-47页

作者： Fengxiang Ma Kangyi Lou Xiaoyang Chen Yue Li College of Science Beijing Forestry UniversityBeijing100083China Department of Renewable Resources 442 Earth Sciences BuildingUniversity of AlbertaEdmontonAlbertaT6G 2E3Canada College of Biological Science and Biotechnology Beijing Forestry UniversityBeijing 100083China College of Forestry South China Agricultural UniversityGuangzhou510642China

We employed capacitance to evaluate the kinship and interspecific variation of homoploid hybrid conifer pinus densata,P.tabuliformis,P.yunnanensis and artificial hybrids of P.tabuliformis(maternal parent)and P.yunnanensis(paternal parent)which were cultivated and selected in the common garden experiment.By measuring capacitance spectra under different voltage frequencies,we could differentiate different germplasms based on the electrical response.We aims to demonstrate that P.densata as the hybrid of P.tabuliformis and P.yunnanensis based on the capacitance values of the species,and to provide new evidence to the previously known biological evidence,as well as and the parental effect on the hybrids.Our results revealed that capacitance values between the species are significantly different in the spectra where P.yunnanensis positioned at the lowest and P.densata was much higher than all other species,indicating that P.densata had possessed a great capacity to store electrical energy.The capacitance spectra of P.densata and the artificial hybrid are not similar,which rejected our hypothesis.Both of the capacitance values of P.densata and the hybrids were closer to P.tabuliformis than to P.yunnanensis,which shows that the maternal influence was stronger than the paternal influence.Correlation analysis on the relationship between capacitance and fitnessrelated characteristics showed that capacitance is negatively correlated to mortality rate,and positively correlated with second-year survival rate.High capacitance values of P.densata and some of the hybrids reveal their superior adaptability to harsh environment in the Tibet Plateau.We concluded that capacitance as a new indicator for plant fitness and evolution evidence of homoploid hybrid conifers.

关键词： pinus densata pinus yunnanensis pinus tabuliformis Hybrid Kinship Capacitance

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Influence of ammonium and nitrate supply on growth, nitrate reductase activity and N-use efficiency in a natural hybrid pine and its parents

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Journal of Plant Ecology 2011年第4期4卷 275-282页

作者： Buqing Yao Jing Cao Changming Zhao Zed Rengel Key Laboratory of Arid and Grassland Ecology Ministry of EducationSchool of Life SciencesLanzhou UniversityLanzhou 730000GansuPeople’s Republic of China School of Earth and Environment The University of Western Australia35 Stirling HighwayCrawleyWA 6009Australia

Selection of tree species with a high capacity to assimilate N and efficiently utilize N resources would facilitate the success of initial tree seedling establishment in infertile soils.The preference for N forms was tested using three pine species(pinus densata,pinus tabuliformis and pinus yunnanensis).pinus densata is a natural diploid hybrid between P.tabuliformis and P.yunnanensis.Methods Seedlings of three pine species were supplied with nitrate-N,ammonium-N(at two different pH regimes)or combined ammonium and nitrate as a nitrogen source in perlite culture in a controlled environment.Important Findings Seedlings of P.densata had higher total biomass and net photosynthesis when supplied with nitrate-N and ammonium nitrate than with ammonium-N.In parental species,total biomass and net photosynthesis for P.yunnanensis seedlings was higher in ammonium-N than in nitrate-N,whereas the other parental species P.tabuliformis had the highest total biomass among species for all treatments except ammonium with CaCO_(3).Most morphological traits in P.densata seedlings were intermediate between its two parental species.However,N-use efficiency and photosynthetic N-use efficiency of P.densata significantly exceeded both parents when supplied with nitrate-N and ammonium nitrate.The results suggested that the diploid hybrid tree species P.densata has a preference for nitrate and is not well adapted to ammonium-N as a sole nitrogen source regardless of the growth medium pH.Based on changes in environmental conditions,such as predicted future temperature increases in high altitude areas associated with climate change,P.densata is likely to be increasingly competitive and have wide adaptation in high altitude regions.

关键词： diploid hybrid pinus densata N forms rootshoot characteristics photosynthetic N-use efficiency nitrate reductase

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