ibclogo XVI International Botanical Congess


Abstract Number: 2747
Poster No. = 2247


EFFECTS OF TISSUE TYPE AND DEVELOPMENT ON DARK RESPIRATION IN TWO PERENNIALS


Cheryl Plumb and Russell K. Monson. University of Colorado, Dept. of EPO Biology, Boulder CO, 80309-0334.


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.


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