Differences in shoot size and allometry between two evergreen broad-leaved shrubs, Aucuba japonica varieties in two contrasting snowfall habitats

Atsushi Kume, Yoshio Ino

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Causes of plant size differences were investigated between two varieties of Aucuba japonica, an evergreen broad-leaved shrub. Aucuba japonica var. borealis is widely distributed in heavy snowfall areas in Japan and is covered, shaded and physically pressured by snow for more than four months of the year. On the other hand, var. japonica is widely distributed in light snowfall areas. The sizes of new shoots and leaves were significantly different between the two varieties with different critical shoot sizes for flowering. The average new shoot dry mass of var. borealis was about one third of that of var. japonica. Despite the differences in growing conditions and shoot size, no significant differences were observed in the allometry of their shoot organs between the two varieties. Large new shoots had thicker and longer stems per biomass than small shoots because of their larger pith volume. The large shoots showed higher efficiency of stem growth per invested biomass and had a higher rate of annual height increase than small shoots. When the size of new shoot rapidly increased from year to year, i.e. the plants are growing well, initiation of flowering was postponed and vegetative growth continued. Small new shoots were tolerant of low productivity conditions but traded vertical gro.wth for an increase in matter allocation to leaves.

Original languageEnglish
Pages (from-to)353-363
Number of pages11
JournalJournal of Plant Research
Volume113
Issue number1112
Publication statusPublished - Dec 2000

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Aucuba japonica
allometry
snow
shrubs
shoots
habitats
flowering
biomass
pith
stem elongation

All Science Journal Classification (ASJC) codes

  • Plant Science

Cite this

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title = "Differences in shoot size and allometry between two evergreen broad-leaved shrubs, Aucuba japonica varieties in two contrasting snowfall habitats",
abstract = "Causes of plant size differences were investigated between two varieties of Aucuba japonica, an evergreen broad-leaved shrub. Aucuba japonica var. borealis is widely distributed in heavy snowfall areas in Japan and is covered, shaded and physically pressured by snow for more than four months of the year. On the other hand, var. japonica is widely distributed in light snowfall areas. The sizes of new shoots and leaves were significantly different between the two varieties with different critical shoot sizes for flowering. The average new shoot dry mass of var. borealis was about one third of that of var. japonica. Despite the differences in growing conditions and shoot size, no significant differences were observed in the allometry of their shoot organs between the two varieties. Large new shoots had thicker and longer stems per biomass than small shoots because of their larger pith volume. The large shoots showed higher efficiency of stem growth per invested biomass and had a higher rate of annual height increase than small shoots. When the size of new shoot rapidly increased from year to year, i.e. the plants are growing well, initiation of flowering was postponed and vegetative growth continued. Small new shoots were tolerant of low productivity conditions but traded vertical gro.wth for an increase in matter allocation to leaves.",
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AU - Ino, Yoshio

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N2 - Causes of plant size differences were investigated between two varieties of Aucuba japonica, an evergreen broad-leaved shrub. Aucuba japonica var. borealis is widely distributed in heavy snowfall areas in Japan and is covered, shaded and physically pressured by snow for more than four months of the year. On the other hand, var. japonica is widely distributed in light snowfall areas. The sizes of new shoots and leaves were significantly different between the two varieties with different critical shoot sizes for flowering. The average new shoot dry mass of var. borealis was about one third of that of var. japonica. Despite the differences in growing conditions and shoot size, no significant differences were observed in the allometry of their shoot organs between the two varieties. Large new shoots had thicker and longer stems per biomass than small shoots because of their larger pith volume. The large shoots showed higher efficiency of stem growth per invested biomass and had a higher rate of annual height increase than small shoots. When the size of new shoot rapidly increased from year to year, i.e. the plants are growing well, initiation of flowering was postponed and vegetative growth continued. Small new shoots were tolerant of low productivity conditions but traded vertical gro.wth for an increase in matter allocation to leaves.

AB - Causes of plant size differences were investigated between two varieties of Aucuba japonica, an evergreen broad-leaved shrub. Aucuba japonica var. borealis is widely distributed in heavy snowfall areas in Japan and is covered, shaded and physically pressured by snow for more than four months of the year. On the other hand, var. japonica is widely distributed in light snowfall areas. The sizes of new shoots and leaves were significantly different between the two varieties with different critical shoot sizes for flowering. The average new shoot dry mass of var. borealis was about one third of that of var. japonica. Despite the differences in growing conditions and shoot size, no significant differences were observed in the allometry of their shoot organs between the two varieties. Large new shoots had thicker and longer stems per biomass than small shoots because of their larger pith volume. The large shoots showed higher efficiency of stem growth per invested biomass and had a higher rate of annual height increase than small shoots. When the size of new shoot rapidly increased from year to year, i.e. the plants are growing well, initiation of flowering was postponed and vegetative growth continued. Small new shoots were tolerant of low productivity conditions but traded vertical gro.wth for an increase in matter allocation to leaves.

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