Dissertation
Dissertation > Agricultural Sciences > Forestry > Forest tree species > Broad-leaved shrubs

Influence of Varied Temperature, Salinity and Moisture on Seed Germination and Seedling Growth of Four Species of Caragana L. in Xinjiang

Author SongBin
Tutor HuangJunHua
School Xinjiang Agricultural University
Course Ornamental Plants and Horticulture
Keywords The golden pheasant children genus Seed germination Break dormancy Salt tolerance Drought resistance
CLC S793
Type Master's thesis
Year 2011
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The golden pheasant children genus (Caragana Fabr.) Plants belonging to the legume (Leguminosae), Xinjiang is the largest area of ??the Chinese the golden pheasant children genus species diversity, the world microphylla children is one of the most concentrated areas of species has the obvious advantage of the type. Xinjiang grassland the golden pheasant child the (of Caragana pumila Pojark.), Narrow-leaf golden pheasant (?) L of Caragana stenophylla Pojark (.), Desert golden pheasant (?) L (Caragana roborovskyi Kom.), Spinosa microphylla children (of Caragana acanthophylla Kom.) The study, to seed germination and break dormancy, seed and seedling salt tolerance, drought resistance research content, explore four microphylla children seed germination and seedling characteristics and stress resistance. After a field investigation, outdoor potted plants, indoor experiments and experimental analysis, data processing, the following conclusions: (1) seed germination experiments show that: grassland the golden pheasant child, narrow leaves the golden pheasant children seed cumulative germination performance prairie microphylla children with narrow leaves the golden pheasant children seed germination rate and concentration; the desert the golden pheasant children with barbed leaves the golden pheasant children seed cumulative germination rate and index were lower. (2) break seed dormancy experiment: the desert the golden pheasant children with barbed leaves the golden pheasant children in higher germination rate under the concentration of sulfuric acid treatment to break dormancy satisfactory results; warm water treatment and mechanical treatment method is conducive to break dormancy, while gibberellin treatment effect. unobvious obvious; stratification, ethylene treatment, lye, liquid nitrogen, comprehensive treatment approach. Observed by scanning electron microscope, the seed coat are important factors affect the desert the golden pheasant children with spinosa microphylla children seed germination. (3) salt stress experiment: different concentrations of NaCl stress on the grasslands the golden pheasant children with narrow leaves microphylla children seed germination was inhibited, the general trend are reduced with the NaCl concentration increased, unsalted processing germination rate; prairie the golden pheasant children with narrow leaf microphylla child habitat soil salt content reflects the two kinds of plants the seed germination characteristics of each habitat adaptability; different concentrations of NaCl stress on the prairie microphylla children, narrow leaves microphylla children, desert microphylla children and thorn leaves the golden pheasant children plant seedlings leaf cell membrane permeability, MDA content, free proline content have different effects on these physiological indicators showed narrow leaves the golden pheasant children than thorn leaves microphylla children more salt-tolerant. (4) water stress experiments: different PEG concentration stress of grassland microphylla children, the stenophylla the golden pheasant children, desert microphylla children and thorn leaves microphylla children seed germination was inhibited, the general trend of decrease with the increase in the concentration of PEG stress maximum germination rate in the control treatment; different times of drought stress of prairie the golden pheasant children, narrow leaves microphylla children, the desert microphylla children and thorn leaf microphylla children plant seedlings leaf cell membrane permeability, MDA content, free prolyl acid content have different effects; four kinds of the golden pheasant children root, stem relative water content, and the habitat soil moisture and drought stress related and comprehensive three physiological indicators, results show that the narrow leaves the golden pheasant children than thorn leaves the golden pheasant children Drought strong.

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