Changes in carbohydrate and nitrogen relationships during episodic growth of Ligustrum japonicum Thunb

Jeff S. Kuehny, William B. Miller, Dennis R. Decoteau

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Abstract

Rooted cuttings of Ligustrum japonicum Thunb., an episodically growing species, were grown hydroponically in a controlled-environment growth chamber to determine allocation of glucose, mannitol, total soluble sugars, and total protein in mature leaves, flush leaves, steins, and roots. During the 65 days of episodic growth, 43% of the total soluble sugars was glucose and 33% mannitol. Glucose concentrations of mature leaves decreased during the first root growth episode, increased in almost all plant tissue during a shoot growth episode and decreased in all plant tissue at initiation of a second font growth episode. Mannitol concentrations in the roots and stems decreased during episodes of root growth and increased during a shout growth episode when leaf flush mannitol concentrations increased. Radiolabeled C applied to leaves before the initiation of the first period of shoot elongation was translocated to the roots. After shoot elongation, just before a root growth episode, most labeled C was translocated to new shoots and mots. Autoradiographs indicated that subsequent episodes of shoot growth were supported by photosynthate from the previous shoot flush. Protein concentrations decreased in all plant tissues during shoot growth but increased in mots and mature leaves during root growth. Concentrations of 15N in leaf and stem tissue indicated retranslocated N supported each episode of shoot growth. Changes in endogenous C and N concentrations and allocation patterns in ligustrum were linked to the control of episodic shoot and rout growth.

Original languageEnglish (US)
Pages (from-to)634-641
Number of pages8
JournalJournal of the American Society for Horticultural Science
Volume122
Issue number5
Publication statusPublished - Sep 1 1997

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All Science Journal Classification (ASJC) codes

  • Genetics
  • Horticulture

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