Study On Root System Growth Character And Their Correlation With The Yield Of Alfalfa

A study was conducted to determine root system characteristics , the correlation analysis of index in root system, cluster analysis of the root system morphology among alfalfa cultivars, Cluster analysis of the yield among alfalfa cultivars,root system growth character and their correlation with the yield of alfalfa for different alfalfa varieties,etc,of thirteen alfalfa with different origins.The results were shown as follow:Study on the growth character of root system among alfalfa cultivars which were seeded in autumn was carried out and the results indicated that there were significant difference in root system biomass and the number of secondary root among alfalfa cultivars (P﹤0.05), the cultivars, Prime and WL323, had the best performance in root system biomass and reached above 32 gram, Meanwhile, WL323 had the most secondary root was17.8, Cao yuan2,ramble had the best perimeter of root system,WL323 had the best volume of root system,Tian shui,陇东,WL323 had the best crown root .the comprehensive evaluation of root system , Prime, WL323, Super7 and L90 were the better than other cultivars; In 3 produces for a year, the overground growth of alfalfa promoted root system growth oneself in the 1st-time and the 2nd-time produce, however, bated root system growth oneself in the 3rd-time produce, the growth character of root system before got into winter restricted the produce of next year, especially the 3rd-time produce in next year.Correlation analysis indicated that,except for crown root,other indexes of root including perimeter of root system, volume of root system, height of root system, lateral root number, was significantly or high significantly positive correlation.Cluster analysis of the yield among alfalfa cultivars indicated that t he frist yield similar, including Long dong,Cao yuan2,Defy,Long zhong, the second includingL90, Super7,L33, WL323,Tian shui,the third including Sitel,Rambler,Prime,Xin jiang da ye。The eight plant were selfed. multi-leaves type and Erect type had the best selfed percent, selfed percent reached 61.54% and 68.04%. S1of multi-leaves and S1of Erect type becames threes type,They are Erect type ,Grivel type, half erect type.Yield of the grivel type is the best high. Our study revealed that plant surviving are likely to have been subjected to a wide array of natural selection pressures and may represent a valuable source of genes for trait related to persistence.Their eventual utilization in breeding programmes depends on the genetic potential of respective individuals for other equally important traits,for example,forage yield.Our study revealed that research involving a wider range of cultivars and plant introduction can be grounped based on root system characteristics.Taking all these factors into consideration, ,forage yield and root system characteristics was significantly or high significantly positive.Forage yield potential of plants was determined with correlation. root system characteristics and cultivars characteristics.