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Related Applied Researches Of The Plant Life Cycle Form And Its Spectrum Characteristics

Posted on:2009-02-02Degree:MasterType:Thesis
Country:ChinaCandidate:W X LiFull Text:PDF
GTID:2190360275967177Subject:Botany
Abstract/Summary:PDF Full Text Request
Applying the theory of plant life cycle form in assessing the health condition of forests and directing the artificially directive breeding of wild plants,the spectrum characteristics of life cycle form of urban forest community,the life cycle form characteristics of Chelidonium majus in different habitats and its relationship with the contents of tannins,flavonoids and alkanoids in different organs were studied.The photosynthesis which provides material foundation for plant life cycle form was investigated in-depth from the aspects of different habitats and organs.The results will enrich the theory system of plant life cycle form and offer scientific foundations and references for the applications of the theory in forest health assessment and directive breeding.1,The artificial community of an urban forest in the botanical garden of Northeast Forestry University was studied.The plant life cycle form of 24 different plant populations from this community were classified by PCA(principal component analysis) method,and vegetative growth(V),sexual growth(S) and Clone growth(C) of each population and the whole community were quantitatively described.Based on this mathematical classification,the succession status and health condition of this community were assessed.For the arbor layer plants(Picea meyeri,Larix gmelini,Pinus svlvestris var.mongolica,Pterocarya stenoptera, Amorpha fruticosa,Acer negundo and Taxus cuspidate),the V proportion accounted for 50%, the S proportion accounted for 24%,while the C proportion accounted for the rest 26%.For the shrub layer plants(Syringa reticulata,Syringa microphylla,Rubus crataegifolius,Lonicera maackii,Magnolia parviflora,Viburnum sargenti,Spiraea trilobata and Spiraea trichocarpa), V proportion accounted for over 50%,and S proportion accounted for a little higher than the C proportion.For the herb layer plants(Carduus crispus,Brylkinia caudata,Chelidonium majus, Inula lineariifolia,Draba nemorosa,Taraxacum mongolicum,Plantago asiatica,Lagopsis supine and Capsella bursa-pastoris),V proportion accounted for nearly 55%,S proportion accounted for 38%,while C proportion only accounted for 7%.These findings showed most plants in this community mainly devoted to the growth of their vegetative body,thus the plant life cycle form of arbor layer,shrub layer and herb layer plants were VS transition type with V form as the main type.Of the 24 species studied in this paper,about one third species were V form,38%of species were VS or VC transition type with V form as the main type,17%of species were VS or SV transition type and 13%of species were VCS transition type.At the viewpoint of community,the life cycle form can be described as V0.54S0.29C0.17,a typical VS transition type,indicating that most of the species in this community are in a healthy status with the V form.Moreover,the relative high(29%) percentage in the S form indicates that the community also tends to sexual reproduction,but it will keep at a steady status within a period of coming future.2,By using the Principal Component Analysis(PCA) method,the characteristic parameters of the plant life cycle forms,i.e.PCA scores and proportions of Vegetative growth (V),Sexual growth(S) and Clonal growth(C) of Chelidonium majus populations at different habitats(including open land,a Ulmus pumila plantation and a Picea meyeri plantation) were quantitatively calculated,then the correlations between these characteristic parameters and the contents of alkaloids,tannin and flavonoids were analyzed in this paper.The results were as follows.1) The plant life cycle forms of Chelidonium majus differed between habitats,when grown at full sun light at the open land was characterized as V0.34 S0.41 C0.25,which was a SV sub-form of the plant life cycle form,showing the habitat here was a DE(Disturbed but still Excellent) habitat for the growth of this herb;when grown in the Ulmus pumila and Picea meyeri plantations were characterized as V0.28 S0.38 C0.34 and V0.27 S0.40 C0.33,which were SC sub-form of the plant life cycle form,showing the habitat here were DF(Disturbed and Fragile) habitats for the growth of this herb.2) The contents of secondary metabolites including tannin, flavonoids and alkaloids in Chelidonium majus in the open land were all lower than those in in the Ulmus pumila and Picea meyeri plantations.The contents of tannin in different organs were leaves>seeds>roots>stems;the contents of flavonoids were seeds>leaves>roots>stems; the contents of alkaloids were leaves>roots>stems.There are no significant differences in the contents of alkaloids in stems and roots of Chelidonium majus in different habitats,the content of alkaloids in Chelidonium majus leaves in the open land was,respectively,59%and 56.7%lower than those in the Ulmus pumila and Picea meyeri plantations.3) There appeared significant linear correlation relationship between the plant life cycle forms of Chelidonium majus and the contents of tannin,flavonoids and alkaloids.The contents of secondary metabolites(tannin,flavonoids and alkaloids) of Chelidonium majus were negatively correlated with the Vegetative and Sexual growth,and positively correlated with the Clone growth.The results indicated the DF habitats in the Ulmus pumila and Picea meyeri plantations were poor comparing to DE habitat in the open land,which changed Chelidonium majus to C form and improved the accumulation of secondary metabolites(tannin,flavonoids and alkaloids),all these results can provide morphological methods and theory on evaluation for the habitat selection and directional accumulation of objective active components in the artificially directive breeding of wild plants.3,The photosynthesis which provides material foundation for plant life cycle form was studied from the aspects of different habitats and organs,the results were as follows.The variances of photosynthetic-related parameters in stems were less sensitive than leaves under temperature stress,which made the photosynthesis of stems were more active than leaves.This photosynthetic feature may benefit its adaptability to the changes of environment.The photosynthetic capacities of both non-photosynthetic and assimilated organs were relatively strong.This character makes plants utilize light energy effectively to convert light energy into energy of their need to serve themselves.
Keywords/Search Tags:plant life cycle form, spectrum of plant life cycle form, health assessment, directive breeding, photosynthesis
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