NDLI: Low oxygen sensing and balancing in plant seeds: a role for nitric oxide

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Low oxygen sensing and balancing in plant seeds: a role for nitric oxide

Content Provider	Semantic Scholar
Author	Borisjuk, Ljudmilla Macherel, David Benamar, Abdelilah Wobus, U. Rolletschek, Hardy
Copyright Year	2007
Abstract	Storage product accumulation in seeds of major crop species is limited by their low internal oxygen concentration. Adjustment of energy and storage metabolism to oxygen deficiency (hypoxia) in seeds is highly relevant for agriculture and biotechnology. However, the mechanisms of low-oxygen sensing and balancing remain a mystery. Here, it is shown that normal hypoxia in seeds of soybean (Glycine max) and pea (Pisum sativum) triggers a nitrite-dependent increase in endogenous nitric oxide (NO) concentrations. NO, in turn, reduces the oxygen consumption of seeds, generating a localized decrease in both ATP availability and biosynthetic activity. Increasing oxygen availability reduces endogenous NO concentrations, thereby abolishing mitochondrial and metabolic inhibition. This auto-regulatory and reversible oxygen balancing, via NO, avoids seed anoxia and suggests a key role for NO in regulating storage activity. This hypothesis is reinforced by changes in energy status (ATP:ADP ratio), steady-state metabolite concentrations and biosynthetic fluxes under NO treatment. The proposed mechanism of low-oxygen sensing and balancing in plants offers the prospect of a new field of study in crop biotechnology.
Starting Page	813
Ending Page	823
Page Count	11
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://www.presens.de/fileadmin/user_upload/publications_abs/ABS_2007_Low_oxygen_sensing_and_balancing_in_Rolletschek.pdf
PubMed reference number	17937762
Volume Number	176
Journal	The New phytologist
Language	English
Access Restriction	Open
Subject Keyword	Adenosine Diphosphate Adenosine Triphosphate Anabolism Anoxia Biotechnology Equilibrium Glycine Hypoxia Nitric Oxide Oxygen Consumption Peas - dietary Plant Physiological Phenomena Plant seeds Precipitating Factors Soybeans nitrite ion
Content Type	Text
Resource Type	Article

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