Physiological and Biochemical Responses of Foxtail Millet to Low Temperature Stress at Seedling Stage
This study investigated the physiological response mechanism of foxtail millet seedlings to low temperature stress,screening of cold-tolerant germplasm,and provided theoretical basis for the selection and breeding of cold-tolerant cultivar.The cold-tolerant foxtail millet cultivar Jingu 21 and the cold-sensitive foxtail millet cultivar Changnong 48 were used as test materials,and two treatments of low temperature(8 ℃)and control(25 ℃)were set up,and height,fresh and dry weights,antioxidant enzyme activities and osmoregulatory substances of seedlings under each treatment were determined before the low temperature treatment,after three days of the low temperature treatment and after three days of the recovery treatment,respectively.The results showed that,compared with control,after three days of low-temperature stress treatment in foxtail millet,all the indicators of seedling agronomic traits were significantly reduced,and the reduction of cold-sensitive cultivar was higher than that of cold-tolerant cultivar.After three days of low-temperature stress treatment,SOD,POD and CAT activities of seedling leaves of cold-tolerant cultivar showed increasing trend,and MDA contents increased significantly.The MDA content of cold-sensitive cultivar was significantly higher than that of cold-tolerant cultivar(P＜0.05),and they had stronger protective enzyme activities.
Foxtail milletSeedling stageLow temperature stressPhysiological and biochemical responses
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