Plant Physiol. EPICENTRE Biotechnologies
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The Relationship between Photosynthesis and a Mastoparan-Induced Hypersensitive Response in Isolated Mesophyll Cells1

Lisa J. Allen, Kennaway B. MacGregor, Randall S. Koop, Doug H. Bruce, Julie Karner, and Alan W. Bown*

Department of Biological Sciences, Brock University, St. Catharines, Ontario, Canada L2S 3A1

The G-protein activator mastoparan (MP) was found to elicit the hypersensitive response (HR) in isolated Asparagus sprengeri mesophyll cells at micromolar concentrations. The HR was characterized by cell death, extracellular alkalinization, and an oxidative burst, indicated by the reduction of molecular O2 to O2·. To our knowledge, this study was the first to monitor photosynthesis during the HR. MP had rapid and dramatic effects on photosynthetic electron transport and excitation energy transfer as determined by variable chlorophyll a fluorescence measurements. A large increase in nonphotochemical quenching of chlorophyll a fluorescence accompanied the initial stages of the oxidative burst. The minimal level of fluorescence was also quenched, which suggests the origin of this nonphotochemical quenching to be a decrease in the antenna size of photosystem II. In contrast, photochemical quenching of fluorescence decreased dramatically during the latter stages of the oxidative burst, indicating a somewhat slower inhibition of photosystem II electron transport. The net consumption of O2 and the initial rate of O2 uptake, elicited by MP, were higher in the light than in the dark. These data indicate that light enhances the oxidative burst and suggest a complex relationship between photosynthesis and the HR.

1   This work was supported by operating grants from the Natural Sciences and Engineering Research Council (NSERC) of Canada to A.W.B. and D.H.B. L.J.A. and R.S.K. were the recipients of NSERC postgraduate scholarships.
*   Corresponding author; e-mail bown{at}spartan.ac.brocku.ca; fax 1-905-688-1855.

Plant Physiol. (1999) 119: 1233-1242
Copyright Clearance Center:   0032-0889/99/119//10
© 1999 American Society of Plant Physiologists




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