Enhanced UV-B radiation could increase crops' flavonoid content but decrease their chlorophyll content and photosynthesis, induce gene change, and result in DNA damage and change of protein content.
The results showed that the proper proportion of B and Mo could increase SOD activity, contends of soluble sugar and chlorophyll, and decrease MDA content.
结果表明：适宜的硼钼配比可使紫花苜蓿超氧化物歧化酶活性、叶绿素和可溶性糖含量提高，丙二醛含量降低。
3
B. campestris content of leaf chlorophyll, leaf area index , leaf area-weight ratio were positive significantly correlated with the PR.