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Seed germination characters of Euphorbia heterophylla Linn.

Su Yinling;Yang Zixiang;Institute of Tropical Eco-agricultural Sciences of Yunnan Academy of Agricultural Sciences;  
Euphorbia heterophylla has been causing serious threats to orchard fruit production and crop production,including corn and sweet potatoes in dry and hot valleys of Sichuan and Yunnan.This study investigated the effects of various environmental factors,including light,temperature and soil moisture,on the seed germination of E.heterophylla.Our results revealed that the optimum temperature for seed germination was between 25-30℃,and seeds could not germinate when temperature was below5℃ or above 45℃;the seeds could germinate when soil relative water content(SRWC)was no less than10%and the germination rate reached the maximum of 71.3% at SRWC of 20%;the germination rate reached to 80.7% when the soil depth was 0cm,while a covered soil of 6 cm in thickness or more effectively inhibited seed germinating;aphotoperiod of 12 h was shown to be advantageous for seed germination;and the neutral or weakly acidic conditions,and low salinity(0.02 mol/L NaCl) environment also favored seed germination.In conclusion,this study would provide scientific evidence for controlling E.heterophylla spreading.
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