tailieunhanh - Báo cáo lâm nghiệp: "Comparison of nitrogenase and nitrate reductase activities in two nitrogen-fixing tree species: black alder (Alnus glutinosa) and black locust (Robinia pseudoacacia)"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Comparison of nitrogenase and nitrate reductase activities in two nitrogen-fixing tree species: black alder (Alnus glutinosa) and black locust (Robinia pseudoacacia). | 772s Ann. Sci. For. 1989 46 suppl. 772S-776S Forest Tree Physiology E. Dreyer et al. eds. Elsevier INRA Comparison of nitrogenase and nitrate reductase activities in two nitrogen-fixing tree species black alder Alnusglutinosa and black locust Robinia pseudoacacia G. Pizelle1 s. Benamar1 F. Boutekrabt1 and G. Thiéry2 1 Laboratoire de Physiologie Végétale et Forestiere Faculte des Sciences BP 239 54506 Vandceuvre-lès-Nancy Cedex and 2 Physiologie Végétale ENSAIA 54500 Vandoeuvre-lès-Nancy France Introduction Among the symbiotic nitrogen-fixing trees of the temperate zone black alder Alnus glutinosa L. Gaertn. and black locust Robinia pseudoacacia L can be regarded as typical actinorhizal frankial and leguminous rhizobial woody species respectively. Important differences between both species concern their biological ecological and symbiotic characteristics and the greater amount of work recently devoted to A. glutinosa which likely prevails over R. pseudoacacia on the following grounds ubiquity in Europe better sylvicultural qualities absence of spines and suckers easier collection of the nitrogen-fixing organs attraction to the more recently recognized actinorhizal symbiosis Tjepkema et al. 1986 . Nevertheless R. pseudoacacia is also a tree of interest both for its role as symbiont in nitrogen fixation and for its potential value as timber and wood fiber source Moiroud and Capellano 1982 Turvey and Smeth- urst 1983 hence our desire to progress in understanding of its physiology. In an extension of our work on nitrogen nutrition of A. glutinosa . Pizelle and Thiéry 1986 the present paper examines the nitrogenase and nitrate reductase activities measured in vivo in R. pseudoacacia and compares them with the data from A. glutinosa. Materials and Methods Plant material was harvested in the early afternoon from 15-20 yr old black alders naturally growing on sandy alluvium and from black locusts planted for about 10 yr on a sandy and stony bank both sites were located .