Studies on the main nitrogen assimilation enzymes activities and nodule cell ultrastructure in the nodule of Alnus cremastogyne

• Published in: Forest research (Beijing) Vol. 7; no. 6; pp. 629 - 633
• Main Authors: Zuhong, Wu, Guozhang, Zhou
• Format: Journal Article
• Language: Chinese
• Published: 01.01.1994
• ISSN: 1001-1498

The activities of nodule average nitrogen-fixing and NR of 1-year-old Alnus cremastogyne seedlings reached its maximum in late May, which were 11.03 mu mol C sub(2)H sub(4)/(gFw*h) and 0.89 mu mol NO super(-) sub(2)/(gFw*h) respectively. When the nodule began senescence in June, both of them decreased rapidly, but the nodule average GS activity increased. The weight of the adult nodule and the old nodule of the 2-year-old seedling was 70% more than its total nodule weight. The ratio of the adult nodule weight to the total nodule weight per seedling was the highest in late May and that of old nodule was the highest in June, they were 51.4% and 82.1% respectively. When the nodule developed from the juvenile to the adult and then to the old, the nitrogenfixing activity decreased with the increase of the GS activity. The NR activity was the highest in the adult, middle in the old and lowest in the juvenile. With the development of nodule, the mitochondria of the host cell decreased, and finally disappeared in the