NR activity was higher in early stage and then lower.
灌浆前期硝酸还原酶活性较高，后期迅速降低。
Examines the NR activity of leaves from 39 clones of eucommia plus.
本文对39个杜仲优树无性系叶片的硝酸还原酶活力进行了测定。
The results showed that the growth, nitrate absorption and NR activity are much lower in the deficiency calcium callus than the normal callus.
结果表明，缺钙后，愈伤组织生长、硝酸盐吸收、NR活性等都比正常钙培养下的愈伤组织降低。
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