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本项研究表明,在两种生长速率不同的杉木无性系间,硝酸还原酶活力存在显差异。一般硝酸还原酶活力高的无性系生长快,新梢平均生长为59cm和76cm。两类无性系植株的硝酸还原酶活力分别为0.08和0.236μmolNO_2~-·h~(-1)·g鲜重~(-1)。硝酸还原酶活力随生长时期变化,生长旺盛时期(8月)硝酸还原酶活力最高。一年生枝条上叶片的硝酸还原酶活力要比二年生枝条上叶片的硝酸还原酶高。当年生主干的新生枝上的成龄叶片,其硝酸还原酶活力高于去年和前年生主干的新生枝上的成龄叶片。当年生枝条中部的成龄叶硝酸还原酶活力明显高于枝顶的未成龄叶片和枝条基部角质化老叶的硝酸还原酶活力。试验结果,认为硝酸还原酶活力作为生长速率的生化指标是可能的。
This study shows that there is a significant difference in nitrate reductase activity between two clones of Chinese fir with different growth rates. In general, the nitrate reductase activity of clones grow fast, the average shoot growth of 59cm and 76cm. The nitrate reductase activities of two clonal plants were 0.08 and 0.236μmolNO_2 ~ - · h -1 g · kg -1, respectively. Nitrate reductase activity with the growth of the period of change, vigorous growth period (August) nitrate reductase activity of the highest. Nitrate reductase activity in leaves of annual shoots is higher than nitrate reductase in leaves of biennial shoots. The annual growth of new leaves in adult leaves, the nitrate reductase activity higher than the regenerative branches last year and previous years, the aging branches of the leaves. The nitrate reductase activity of aged leaves in the middle part of the annual shoots was significantly higher than that of the young leaves at the shoots and the keratinized old leaves at the base of shoots. As a result of the test, it is considered that the nitrate reductase activity is a biochemical indicator of the growth rate.