Effects Of Exogenous Selenium On Seed Germination, Seedling Growth And Quality Of Sugar Bee

Selenium is a necessary micronutrient for animals and plants.Both deficiency and excess of selenium will have adverse effects.Sugar beet,an important Cash crop,is not only used in sugar production,but also has high nutritional and pharmacological value as a by-product,so it is very important to study the effect of exogenous selenium on sugar beet.In this study,two different sugarbeet cultivars were used as experimental materials.The methods of seed soaking,hydroponic and field spraying with nano-selenium and disodium selenite were used,the response mechanism of sugar beet to exogenous selenium was studied by measuring seed germination parameters,seedling physiological and biochemical indexes,root quality and nutrient elements.The main findings of the paper are as follows:In sugarbeet seed germination test,with the increase of nano-selenium treatment concentration,the germination rate and germination potential showed an upward trend.When the treatment concentration reached 20 mg/L,the germination rate and germination potential of sugarbeet seeds reached the maximum,and when the treatment concentration reached 400 mg/L,the germination rate and germination potential of sugarbeet seeds were inhibited.With the increase of disodium selenite concentration,the germination rate and germination potential of seeds showed a trend of first increasing and then decreasing.When the concentration of sugar beet reached 20 mg/L,the germination rate and germination potential reached the maximum,and at 400 mg/L,there was a significant difference with the control group.After nano-se treatment,the content of MDA in sugar beet seedlings was increased,the activity of SOD increased first and then decreased,and reached the highest value at100 mg/L,which was significantly different from the control group,and the activity of CAT decreased,the POD activity of red beet increased first and then decreased,while that of sugar beet decreased first and then increased.The content of MDA in sugarbeet seedlings increased with the increase of disodium selenite concentration,while the activity of SOD increased at first and then decreased,reaching the peak at 20mg/L,the activities of POD and CAT increased.Spraying SE on the leaf increased the content of K,Cu,Mo in the root tuber of edible red beet,decreased the content of Zn,Mn at low concentration and increased the content of Co at high concentration,and nano-se increased the content of K,Na,Cu,Mo,Co in sugar beet,the content of Zn was inhibited at low concentration and promoted at high concentration.With the increase of nano-se concentration,the content of SE increased first and then decreased,and reached the highest at 80mg/L,which was significantly different from the control group.The content of SE in the root tuber of sugarbeet has negative correlation with Ca,Mn,Fe,Zn and positive correlation with K,Mo.When the concentration of nano-se was 20mg/L,the protein content of edible red beet increased,while that of sugar beet decreased.Spraying nano-se on the leaf could inhibit the content of beta-carotene in edible red beet,and the content of beta-carotene decreased first and then increased with the increase of nano-se concentration.Compared with the control,the sugar content of sugar beet decreased and the content of K,Na andα-N increased as a whole.To sum up,the optimum seed germination concentration was determined to be 20 mgl by soaking beet seeds with nano-selenium and disodium selenite Hydroponic experiments showed that nano-selenium and disodium selenite had different effects on the growth and antioxidant capacity of sugar beet The field experiment showed that spraying nano-se on the leaf could effectively increase the content of se in the root tuber of sugarbeet.