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Permanent link (DOI): https://doi.org/10.7939/R34T6F59M

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Amino Acid Utilization in Seeds of Loblolly Pine during Germination and Early Seedling Growth: I. Arginine and Arginase Activity Open Access

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Author or creator
King, J. E.
Gifford, D. J.
Additional contributors
Subject/Keyword
Embryonic axis
Developmental biochemistry
Megagametophyte
Metabolism
Fir seeds
Developing soybean cotyledons
Scots pine
Food mobilization
Cucumis-sativus L
Storage proteins
Type of item
Journal Article (Published)
Language
English
Place
Time
Description
Abstract: The mobilization and utilization of the major storage proteins in loblolly pine (Pinus taeda L.) seeds following imbibition were investigated. Most of the seed protein reserves were contained within the megagametophyte. Breakdown of these proteins occurred primarily following radicle emergence and correlated with a substantial increase in the free amino acid pool in the seedling; the majority of this increase appeared to be the result of export from the megagametophyte. The megagametophyte was able to break down storage proteins and export free amino acids in the absence of the seedling. Arginine (Arg) was the most abundant amino acid among the principal storage proteins of the megagametophyte and was a major component of the free amino acid pools in both the seedling and the megagametophyte. The increase in free Arg coincided with a marked increase in arginase activity, mainly localized within the cotyledons and epicotyl of the seedling. Arginase activity was negligible in isolated seedlings. Experiments with phenylphosphorodiamidate, a urease inhibitor, supported the hypothesis that arginase participates in Arg metabolism in the seedling. The results of this study indicate that Arg could play an important role in the nutrition of loblolly pine during early seedling growth.
Date created
1997
DOI
doi:10.7939/R34T6F59M
License information
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© 1997 American Society of Plant Biologists. This version of this article is open access and can be downloaded and shared. The original author(s) and source must be cited.
Citation for previous publication
King, J. E., & Gifford, D. J. (1997). Amino Acid Utilization in Seeds of Loblolly Pine during Germination and Early Seedling Growth: I. Arginine and Arginase Activity. Plant Physiology, 113(4), 1125-1135.
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File title: Amino Acid Utilization in Seeds of Loblolly Pine during Germination and Early Seedling Growth: I. Arginine and Arginase Activity
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