Wang, YH , Ludidi, N , Cahill, DM , Gehring, CA , Irving, HR .
Interactions between plant natriuretic peptide and abscisic acid.
The peptide hormone plant natriuretic peptide (PNP), which is recognised by the antibody to human atrial natriuretic peptide (hANP), is involved in the regulation of sodium and water balance in plants. PNP is up-regulated under salt and drought conditions as is the classical plant hormone abscisic acid (ABA). PNP is able to reduce and delay the effect of ABA on guard cell movement. However, ABA does not influence PNP-induced protoplast volume increases. During this process, cyclic guanosine monophosphate (cGMP) levels are elevated rapidly and transiently. Our preliminary protoplast transient expression assays indicate that ABA has no impact on PNP expression (AtPNP-A promoter-GUS); while PNP is able to suppress an ABA responsive promoter (RD29A promoter-LUC) for a short period of time. PNP appears to act transiently and is not directly modulated by ABA. PNP may modulate some ABA induced responses so as to benefit the growth and survival of stressed plants.
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1 - Monash University, Department of Pharmaceutical Biology, 381 Royal Parade, Parkville, Melbourne, Victoria, 3052, Australia
2 - Stellenbosch University, Institute for Plant Biotechnology
3 - Deakin University, School of Biological and Chemical Sciences
4 - University of the Western Cape, Department of Biotechnology
5 - Monash University, Department of Pharmaceutical Biology
Presentation Type: Plant Biology Abstract
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM