期刊
PLANTA
卷 249, 期 4, 页码 1073-1085出版社
SPRINGER
DOI: 10.1007/s00425-018-3061-0
关键词
Auxin conjugates; Conjugate hydrolysis; IAA amidohydrolase; Indole-3-acetic acid; Seed auxin precursors; Strawberry achenes; Woodland strawberry
资金
- USDA/ARS CRIS [8042-21220-254-00D]
- Agriculture and Food Research Initiative from the USDA National Institute of Food and Agriculture [2018-67011-28056, 2018-67013-27503]
- NSF Plant Genome Research Program [IOS-1238812]
- Minnesota Agricultural Experiment Station
- Gordon and Margaret Bailey Endowment for Environmental Horticulture
Main conclusionIndole-3-acetylaspartate and indole-3-acetylglutamate are the stored auxin amino acid conjugates of the achene of the diploid strawberry and serve as sources of auxin during seedling growth.The edible part of the strawberry, a pseudocarp, has long been known to enlarge in response to auxin produced by the developing achenes, the botanical true fruit. Auxin homeostasis involves a complex interaction between biosynthesis, conjugate formation and hydrolysis, catabolism and transport. Strawberry tissues are capable of synthesizing auxin conjugates, and transcriptome data support the expression of genes involved in IAA conjugate formation and hydrolysis throughout embryo development and subsequent seedling growth. Using a highly sensitive and selective mass spectrometric method, we identified all the low molecular weight indole-auxin amino acid conjugates in achenes of F. vesca as consisting of indole-3-acetylaspartate (IAasp) and indole-3-acetylglutamate (IAglu). In contrast to what has been proposed to occur in Arabidopsis, we determined that IAasp and IAglu are hydrolyzed by seedlings to provide a source of free IAA for growth.
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