Spring Germination Of Different Varieties Of Milk Vetch And The Comparative Study Of Drought Resistance At Seedling Stage

Astragalus sinicus L. is an excellent legume, it is in many aspects of social life are irreplaceable important role. Generally milk vetch in early to mid-October sowing in September, the second year of harvest in late May early-May, but due to the growth habits of milk vetch unlimited, as long as light, temperature, water, fertilizer and suitable conditions In the longer season will continue to budding, flowering and fruiting. The current drought resistance of milk vetch does not form a complete system to study the drought resistance of spring Chinese milk vetch milk vetch drought on improving the comprehensive evaluation system, the development of Chinese milk vetch annual grass, breeding drought yield Ziyun new varieties and for the British season, winning a very important high value. This study climatic conditions in Hunan province, the two high-quality milk vetch varieties and drought resistance were compared using the test evaluation of drought resistance were analyzed, the main research results are as follows:1. In the room temperature conditions, respectively, using the concentration of 5%, 10%,15%,20%,25% PEG hypertonic solution on the two high-quality milk vetch to water stress, comprehensive evaluation of the Germination Stage The results showed that: Purple glamorous and drought tolerance at the germination stage was stronger than in Ningbo Bridge.2. Legume drought by drawing a number of aspects of research, and Chang, "received early sowing as early as the biological characteristics of milk vetch" conclusion (April, May, June respectively the milk vetch seed to April 8 plus conventional sowing fertilization+irrigation treatment of various physiological indicators of the best milk vetch) on April 8 Chinese milk vetch sowing, drought stress using the pot method, set of four moisture gradient, the two high-quality Chinese milk vetch varieties seedling evaluation results show that:with milk vetch Germination Stage is consistent comparison, purple milk vetch glamorous and Drought Resistance at better than Ningbo Bridge Chinese milk vetch.3. On the Comparative Study of Chinese milk vetch seedling drought resistance evaluation was analyzed, results showed that:soluble sugar content, proline content, MDA content and biomass of four most sensitive indicators of drought stress, Drought can be used directly as milk vetch comprehensive index; relative conductivity, plant height, growth rate, relative growth rate, an increase of volume, root length, root to shoot ratio of seven indicators are more sensitive to drought stress, when the stress intensity is high Astragalus can be used as the evaluation index of drought resistance; and below-ground biomass of this indicator is not sensitive to drought stress in most, can be used as the reference for the evaluation of drought resistance.