Affiliation:
1. Section of Cell and Developmental Biology, Division of Biological Sciences, University of California at San Diego, La Jolla, CA 92093–0116, USA.
Abstract
Nitric oxide (NO) serves as a signal in plants. An
Arabidopsis
mutant (
Atnos1
) was identified that had impaired NO production, organ growth, and abscisic acid–induced stomatal movements. Expression of
AtNOS1
with a viral promoter in
Atnos1
mutant plants resulted in overproduction of NO. Purified AtNOS1 protein used the substrates arginine and nicotinamide adenine dinucleotide phosphate and was activated by Ca
2+
and calmodulin-like mammalian endothelial nitric oxide synthase and neuronal nitric oxide synthase, yet it is a distinct enzyme with no sequence similarities to any mammalian isoform. Thus,
AtNOS1
encodes a distinct nitric oxide synthase that regulates growth and hormonal signaling in plants.
Publisher
American Association for the Advancement of Science (AAAS)
Cited by
753 articles.
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