Preliminary Explanation Of The Mechanism About Stimulation Of Selenium In Rice Seed Germination

Effect of selenium on the germination of rice seed was studied and the results showed that selenium stimulated rice seed germination significantly. Difference in stimulation existed in different cultivars. Selenium stimulated seed germination at lower levels but inhibited at higher levels. Also, difference in sensitivity existed between root and sprout. Selenium stimulated root much more than sprout. Na₂SeO₃ treatment increased amylase activity and root activity, stimulated root growth, improved the content of soluble sugar, free amino acid and soluble protein. Na₂SeO₄ treatment stimulated root growth and root activity, but exsisted little effect on amylase activity and the content of soluble sugar, free amino acid and soluble protein. Na₂SeO₄ and Na₂SeO₃ significantly improve rice seeds phosphorus, zinc, manganese, boron, magnesium transit and rice seedlings, the absorption of these elements significantly inhibit the absorption of rice seedling to copper Na₂SeO₄ has halted, rice grain to shoot and root of copper in transit, but in Na₂SeO₃ promoted rice seed of bronze and iron Na₂SeO₄ inhibit transhipment, outside of iron transshipment. Accordling to these results as above, it was proposed that selenite stimulation in rice seed germination contributed much more to the translocation of nutrients from rice seeds than increasing amylase activity.