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The Symbiotic Relationship Of Am Fungi And The Chenopodiaceae Plant In Saline And Alkaline Land

Posted on:2016-01-14Degree:MasterType:Thesis
Country:ChinaCandidate:H Q YuFull Text:PDF
GTID:2180330464957307Subject:Grass science
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Arbuscular mycorrhizal(Arbuscular mycorrhizae, AM) is the symbionts.of the root of plants and arbuscular mycorrhizal fungi(Arbuscular mycorrhizae fungi, AMF)in the soil.Fungi obtain the necessary carbohydrate and other nutrients, while the plants need nutrition and moisture, etc from fungi, so as to achieve a high degree of unity and mutual benefit. AM fungi widely exists in various types of soil and there are vast majority of symbionts mycorrhizal formation in terrestrial plants. They can significantly improve the ability of resistance to salt stress, drought stress and nutrient poor stress in plants.Jilin province in the west songnen plain is one of the famous soda saline soil concentrated area in the world. For a long time,by the influence of excessive reclamation,overgrazing, drought and flood, the increasing soil salinization seriously damage the sustainable development of animal husbandry and human survival environment.Therefore, to explore the biological mechanisms of saline-alkali land vegetation restoration on the local farming and animal husbandry production and ecological environment protection has important scientific and practical significance.Chenopodiaceae plants is one of the important groups in salinization area recovery and they have good economic value.But chenopodiaceae plants are usually considered mycorrhizal plants, in recent years, some studies have found that the roots of the chenopodiaceae plants also have AM mycorrhizal structure, and AM fungi can promote chenopodiaceae plant growth, improve its resistance to salt, drought resistance, nutrient poor,etc. Therefore, the purpose of this experimental study has the following three aspects:Firstly. To prove the situation of AMF infection in chenopodiaceae plants and screen the species of chenopodiaceae plants which have mycorrhizal;Secondly. To prove the AMF capability of chenopodiaceae plants resistance to salt stress;Thirdly. To prove the AMF capability of chenopodiaceae plants resistance to nutrient poor.The species of chenopodiaceae plants and soil are collected from xinjiang grassland,Tibetan plateau and songnen plains.To observe the situation of mycorrhizal infection in chenopodiaceae plants with microscopic morphology and to determinate the relationship between PH and conductivity and mycorrhizal infection rate.Screening the species of chenopodiaceae plant which have mycorrhizal.The experimental results show that 60% of chenopodiaceae plants with mycorrhizal structure, some types of chenopodiaceae plants mycorrhizal infection rates as high as 97% and p H and conductivity of soil and mycorrhizal infection rate showed a negative correlation; In a certain of salt concentration, with the increase of salt concentration, the biomass of chenopodiaceae plants will also increase. At thesame time, the mycorrhizal infection rate is also a trend of increase, under the same salt concentration,the plants which inoculated by AMF grow better than control. The malondialdehyde content and hydrogen peroxide content in chenopodiaceae plants decreased significantly after inoculated by AMF, while the peroxidase activity increased significantly;Under different nutrient conditions, the higher of phosphorus content,the plants grow better and the phosphorus content of plants are increased.But the mycorrhizal infection rate, the number of the spore and hyphae density are all decreased, under the same phosphorus content,the chenopodiaceae plants inoculation of AM fungi grow better than control.This study can be concluded that most of the chenopodiaceae plants have the phenomenon of mycorrhizal infection, and mycorrhizal infection rate is negative correlation with soil PH and conductivity; AM fungi can significantly increase the biomass of chenopodiaceae plants, and can improve its resistance to salt stress and poor nutrient stress.At the same time, in a certain of salt concent,and with the increase of salt content, AM mycorrhizal infection rate and spore number and hyphae density will increase too.with the increase of phosphorus content, AM mycorrhizal infection rate and spore number and hyphae density will decrease.Therefore,this research has significant value to to reveal the symbiotic mechanism of AM fungi and chenopodiaceae plants and to help us deeply understand the role of AM fungi in the salinization grassland vegetation restoration process.
Keywords/Search Tags:Arbuscular mycorrhizal fungi(AMF), salinity, Chenopodiaceae plants, Mycorrhizal coloniztion
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