Methionine Sulfoximine Effects on C4 Plant Leaf Discs: Comparison with C3 Species |
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| Authors: | Platt, Steven G. Rand, Laura |
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| Affiliation: | Western Regional Research Center, Agricultural Research Service, United States Department of Agriculture 800 Buchanan Street, Berkeley, California 94710, U. S. A. |
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| Abstract: | Methionine sulfoximine caused ammonia accumulation and photosyntheticrate inhibition in leaf discs from two C4 species, Zea maysL. cv. F. M. Cross (Hybrid) and Sorghum bicolor L. Moench cv.NC-70X, as well as one C3 plant species, Datura stramonium L.cv. stramonium. Similar results were obtained earlier with theC3 species Spinacia oleracea L. The effect occurred in the absenceof inorganic nitrogen reduction and was light dependent. Ammoniaaccumulation rates were similar in all four species examined.The results support a role for glutamine synthetase in leafammonia recycling in both C4 and C3 leaves. 1 Current address: Cetus Madison Corporation, 2208 Parview Road,Middleton, WI 53562, U.S.A. (Received November 2, 1981; Accepted April 28, 1982) |
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