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Effects of Chilling Stress on the Root Characteristics of 5 Alfalfa Varieties

WANG Yun-tao;YU Lin-qing;LI Jing-zhu;SUN Juan-juan;XIE Ji-hong;Zhangjiakou University;Grassland Research Institute of CAAS;  
The effects of chilling stress on alfalfa root morphology were studied using 5alfalfa varieties as material.The survival rates and related root morphology of tested varieties were observed and compared by variance analysis,correlation analysis and cluster analysis.The results showed that the survival rates and the root characteristics of different alfalfa varieties were obvious difference after low temperature stress.The survival rate was significant or extremely significant positive correlated with the diameters of taproot and lateral root,negative correlated with lateral root position,not correlated with lateral root number.The biological production was extremely significant positive correlated with taproot length,taproot diameter,lateral root diameter and lateral root number,was significantly negative correlated with lateral root position.The survival rate decreased as the time of chilling stress increasing.Therefore,‘Gongnong No.1'and‘Longmu 801'can be used as popularized varieties in cold area.
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