TY - JOUR
AU - VARUGHESE,, GRACY
AB - Abstract To quantify the development of the mistletoe Phoradendron juniperinum within the branches of its host, Juniperus occidentalism the growth of longitudinal (cortical) strands was measured. To begin, infections were classified positionally as either lateral (attached along sides of branches) or pseudoterminal (secondarily occurring at ends of branches). For both infection types five shoot dry weight classes were established, allowing comparisons of growth of longitudinal strands to shoot dry weight. For lateral infections of all weight classes longitudinal strands showed greater basipetal than acropetal growth. In early stages of seedling establishment endophytic system spread is emphasized over shoot growth while in older plants shoot growth is emphasized; this feature is reflected in the dramatic decrease in spread/weight values over time. Comparisons between lateral and pseudoterminal infections of all weight classes revealed that lateral infections extend greater distances within host bark. The significantly lesser growth shown by the endophytic system of pseudoterminal infections suggests that they occupy positions providing better access to host water and minerals. Absorptive efficiency values were calculated by dividing shoot mass by the length and number of longitudinal strands. Viewed in this manner, the absorptive units (longitudinal strands with sinkers) of pseudoterminal infections are nearly three times as efficient as those of lateral infections. The determination of spread/weight and absorptive efficiency values represents a novel approach to endophytic system study that has applicability in physiological and ecological studies as well as in mistletoe-control methods. Phorandendron juniperinum Engelm. ex A. Gray subsp. juniperinum, mistletoe, endophytic system, growth rate This content is only available as a PDF. Author notes * This is Environmental Sciences and Resources Program Publication No. 235 © 1991 Annals of Botany Company
TI - Growth of Longitudinal Strands of Phoradendron juniperinum (Viscaceae) in Shoots of Juniperus occidentalism
JO - Annals of Botany
DO - 10.1093/oxfordjournals.aob.a088114
DA - 1991-02-01
UR - https://www.deepdyve.com/lp/oxford-university-press/growth-of-longitudinal-strands-of-phoradendron-juniperinum-viscaceae-L01q908N7m
SP - 153
EP - 161
VL - 67
IS - 2
DP - DeepDyve
ER -