Studies On Drought Resistance About Seeds And Seedlings Of Three Wild Ground Cover Plant

In this paper, Volia yedoensis、Papaver naudicaule and Limonium bicolor as the research object. Mainly on the drought resistance of the three kinds of wild groundcover plants were studied. At seed germination stage, solution with different concentration of polyethylene glycol (PEG-6000) was simulated drought stress, the seed germination rate, germination index, the drought index of indexes are determined, and by comparing these indicators compared to the three kinds of plant seeds during germination drought resistance strength; In seedling stage, through natural normal irrigation and drought control, measure its physiological and biochemical indexes, thus obtains three kinds of plant drought resistance strength and the capability of the three kinds of plant drought resistance index.The conclusion is as follows:1、In the seed germination stage, it has different results about germination of using different concentrations of PEG-6000solution to treat seeds. Low concentration of treatment fluid can promote the germination of Limonium bicolor in a certain extent,5%concentrations have the best comprehensive results, germination rate is78%, droughtindex is1.56. High concentrations of PEG-6000solution has a certain inhibition toLimonium bicolor seed germination.2、In the growth of seedling stage, in the earlier middle drought stress, along with the time extension, the soil water of Limonium bicolor decreased slowly, and its leaves’ POD、SOD and content of soluble protein increased more slowly, as well as the MDA content increased more slowly too, which showed the weaker drought stress less to Limonium bicolor. With the drought degree increasing, the plants gradually lose their ability to coordinate in the middle and later periods of the drought stress, and the leaf blade wilt and death. Corresponding Volia yedoensis did slightly worse than Limonium bicolor, and Papaver naudicaule worst.3、Through a comprehensive analysis of three plants in the seed germination and seedling stage, the drought-resistant ability from big to small in turn is Limonium bicolor>Volia yedoensis> Papaver naudicaule.