XVI International Botanical Congess
The purposes of this study were to quantify the pattern of respiration (R) over the growing season, to examine differences in R among aboveground tissues, and to describe differences in the seasonal pattern of R among aboveground tissues of Bistorta bistortoides (Pursh) Small and Campanula rotundifolia L. Rate of R differed among aboveground tissues and decreased over the growing season in each tissue. In both species, rates of R were highest in reproductive structures and decreased by 80-90% over the season. Rates of R were lower in leaves than in reproductive structure and decreased by 17 and 35% in C. rotundifolia and B. bistortoides, respectively. Rates of R in stems were lowest and decreased by approximately 50% over the growing season. In addition, tissue type significantly affected the seasonal pattern of R.