抄録
Changes in leaf and trunk characteristics related to the starch yield with age of representative early- and late-flowering sago folk varieties, Rondo and Para, were compared around Lake Sentani near Japapura, Papua, Indonesia. Both folk varieties showed the same patterns of change in leaf and trunk characteristics, which were categorized into four and five patterns, respectively. The patterns for leaf growth are Type A: an increase until trunk formation (TF) after sucker emergence (SE) and then gradual decline (leaf length); Type B: an increase until TF after SE and then maintaining a definite value (stomatal density); Type C: an increase until TF after SE and then maintaining a definite value for some period of time, then a decrease after flower-bud formation (FBF) (number of leaflets; the longest leaflet; length, width and SPAD value; and leaflet area, leaf area, and leaf area per plant); and Type D: an increase until some trunk elongation after SE occurred and then maintaining a definite value (number of leaves and the longest leaflet thickness). Those for trunk growth are Type A: hardly a change after TF (trunk diameter); Type B: an increase until FBF after TF and then maintaining a definite value (trunk length, weight, and volume); Type C: a sharp increase over a certain period of time after TF and then maintaining a definite value until FBF (pith dry matter and starch percentage); Type D: a sharp decrease for a certain period of time after TF and then maintaining a definite value until FBF (pith total sugar percentage); and Type E: no clear change for some period of time after TF and an increase until FBF (pith starch content).
