Four Kinds Of Garden Plants Research Drought Resistance

In the shortage of water resources and the urban atmospheric pollution and urban landscaping requirements for increasing pressure, water-saving garden concept emerged, and the basic elements for landscape garden plants were also reached a new high, it also become the world garden workers research hotspots. This appreciation of 4 kinds of garden plant in water stress under the environment of multiple physiological and biochemical index for future research and analysis in water-saving garden plants provide theoretical basis and reference for the research results obtained as follows:1 As the degree of water stress caused by various varieties, the relative water content of drop off, the greatest reduction of Sorbaria kirilowii (Reqel) Maxim,next is Fontanesia fortunei Carr and Amygdalus triloba, Syringa oblata is least, especially in the final sampling,The Sorbaria kirilowii (Reqel) Maxim relative water content of drop off sharply, adjust the water Sorbaria kirilowii (Reqel) Maxim,remain poor ability, especially to the stress of water, this could dramatically with Sorbaria kirilowii (Reqel) Maxim in severe drought stress keep moisture, i.e. Sorbaria kirilowii (Reqel) Maxim about long-term drought stress can endure, And Amygdalus triloba Fontanesia fortunei Carr. under severe drought stress can through the adjustment mechanism, such as closing pores and reduce metabolism to resist drought stress, etc, in order to maintain their relative water content, the strong ability to drought, the adjustment, the lilac keep moisture ability is the strongest.2 Water saturation of change and the relative water content change instead, rising trend.4 the water saturation kept by plant of prolonged stress deficit with a rise of the trend of rising very slow lilac, Sorbaria kirilowii (Reqel) Maxim rise, and Amygdalus triloba between middle thousand-willow. This trend and leaf relative content changes inversely related. From the amount of water saturation deficit, compared to the other three kinds of lilac significantly below the plant, it is easy to see in the same water conditions, four kinds of plants in the Syringa oblata moisture deficit minimum, keep the water and endurance arid is stronger than the other three varieties, and Amygdalus triloba Fontanesia fortunei Carr., Sorbaria kirilowii (Reqel) Maxim is the worst.3 To a certain extent in the hydraulic resistance, also reflect the blade and hydraulic fluid from the body of the slower rate, leaf that keep moisture, namely the stronger ability to drought, conversely, the weak. So by the experimental results indicate that the worst drought, pearl mei, lilac, from strong drought best drought to Syringa oblata Lindl> Fontanesiafortunei Carr> Prunnus triloba Lindl> Sorbaria sorbifolia(L.)A.Br 4 Different species to drought stress, water level, the stress response each are not identical, different species of water with different regulating mode, in order to adapt to the different degree of water stress.5 Every species of mild stress and chlorophyll b vitamin chlorophyll content of most no shows significant decline of stress, can be used as a species of appraisal index is sensitive. Each species in severe water stress chla CHLB and the content of the drought, water stress, the tree with constrictive, chlorophyll content decrease.6 In the MDA content of the single index to see four garden plants were weak order: Syringa oblata Lindl> Fontanesiafortunei Carr> Prunnus triloba Lindl> Sorbaria sorbifolia(L.)A.Br. The comprehensive judgment and the result shows that the same as plants were MDA can a weak.7 Each species, protective enzyme aspects of SOD under water stress is increased and the basic rule of each species, SOD activity of up and down, it may be different species of drought tolerance and weak. Under water stress, in light of the species, with the POD activity, each species under water stress were the POD activity have different level.8 All species of proline under water stress, and the general trend is changing for mild stress and moderate, severe stress under stress. Each species under severe water stress proline content has dropped substantially, explain in severe water stress proline had not as infiltration protection substances. This study9 All species soluble sugar content rise fall of different species, this law and the relevant regulation mechanism of itself. Each species under water stress soluble sugar content has different rate was increased, indicating the soluble sugar content increased moisture deficit is one of the protective reaction, can be used as a species of physiological indexes of drought resistance.10 Subordinate function method to use multiple evaluation indexes of drought resistance of various physical and adaptability evaluation, four kinds of garden plant resistance from high to low ranking for the lilacs:Syringa oblata Lindl> Fontanesiafortunei Carr>Prunnus triloba Lindl> Sorbaria sorbifolia(L.)A.Br various species of physiology reaction of drought and adaptability and moisture conditions are basically the same.