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Annals of Botany 81: 535-543, 1998
© 1998 Annals of Botany Company

Intermittent Shoot Growth in Saplings ofAcanthopanax sciadophylloides(Araliaceae)

TATSUYUKI SEINO+,

Graduate School of Environmental Earth Science, Hokkaido University, Sapporo, 060 0810, Japan

July 16, 1997 ; August 21, 1997 . December 25, 1997 .

Annual shoot growth on a monopodial orthotropic stem of saplings ofAcanthopanax sciadophylloidesin a deciduous mixed forest in northern Japan was classified into two distinct phases: stagnant (S-phase) and extension phase (E-phase). Both S- and E-phases were observed in an intermittent manner on the same stem. S-phase growth was repeated more on stems in closed canopies than in canopy gaps. S- and E-phase shoots differed in morphological and phenological performance. S-phase shoots flushed and stopped elongation by mid-spring, while E-phase shoots continued elongating until mid-summer with expansion of new leaves. S-phase shoots also allocated less biomass to stems than E-phase shoots. These results suggest that the intermittent sequence of the two growth phases corresponds to time-differentiation of adaptive performance in this species. Saplings ofA. sciadophylloidesare distributed over a wide range of environments as a result of this temporal adjustment.Copyright 1998 Annals of Botany Company

shoot growth,Acanthopanax sciadophylloides, growth periodicity, tree architecture, allocation, net production, shade adaptation, Araliaceae


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