RRC ID 33184
Author Koshio A, Hasegawa T, Okada R, Takeno K.
Title Endogenous factors regulating poor-nutrition stress-induced flowering in pharbitis: The involvement of metabolic pathways regulated by aminooxyacetic acid.
Journal J. Plant Physiol.
Abstract The short-day plant pharbitis (also called Japanese morning glory), Ipomoea nil (formerly Pharbitis nil), was induced to flower by poor-nutrition stress. This stress-induced flowering was inhibited by aminooxyacetic acid (AOA), which is a known inhibitor of phenylalanine ammonia-lyase (PAL) and the synthesis of indole-3-acetic acid (IAA) and 1-aminocycropropane-1-carboxylic acid (ACC) and thus regulates endogenous levels of salicylic acid (SA), IAA and polyamine (PA). Stress treatment increased PAL activity in cotyledons, and AOA suppressed this increase. The observed PAL activity and flowering response correlate positively, indicating that AOA functions as a PAL inhibitor. The inhibition of stress-induced flowering by AOA was also overcome by IAA. An antiauxin, 4-chlorophenoxy isobutyric acid, inhibited stress-induced flowering. Both SA and IAA promoted flowering induced by stress. PA also promoted flowering, and the effective PA was found to be putrescine (Put). These results suggest that all of the pathways leading to the synthesis of SA, IAA and Put are responsive to the flowering inhibition by AOA and that these endogenous factors may be involved in the regulation of stress-induced flowering. However, as none of them induced flowering under non-stress conditions, they may function cooperatively to promote flowering.
Volume 173
Pages 82-8
Published 2015-1-15
DOI 10.1016/j.jplph.2014.09.004
PII S0176-1617(14)00261-2
PMID 25462081
MeSH Amino Acids, Cyclic / metabolism Aminooxyacetic Acid / pharmacology* Cotyledon / drug effects Cotyledon / enzymology Cotyledon / physiology Flowers / drug effects Flowers / enzymology Flowers / physiology Gene Expression Regulation, Plant / drug effects Indoleacetic Acids / metabolism Ipomoea nil / drug effects Ipomoea nil / enzymology Ipomoea nil / physiology* Metabolic Networks and Pathways / drug effects Phenylalanine Ammonia-Lyase / antagonists & inhibitors* Phenylalanine Ammonia-Lyase / metabolism Plant Growth Regulators / metabolism* Plant Proteins / antagonists & inhibitors Plant Proteins / metabolism Polyamines / metabolism Putrescine / metabolism Salicylic Acid / metabolism Stress, Physiological
IF 2.825
Times Cited 3
Morning Glory Q0079