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KMID : 0368419840270040253
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Journal of Plant Biology
1984 Volume.27 No. 4 p.253 ~ p.261
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Effect of Inorganic Nitrogen on Photorespiration of Pea Leaves
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Lee In-Cheol
Lee Sun-Hi
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Abstract
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Leaf discs isolated from the pea seedling grown in nutrient solution conatining 5 mM ammonia or nitrate exhibited a half level of photorespiration as compared with the nitrogen free control. The manifestation of the ammonia effect appeared somewhat earlier than that of nitrate effect, but this difference subsided as the culture periods was extended. The total amount of CO_2 fixed by leaves from nitrogen-supplemented seedlings showed approximately 1.5 fold increase over the control with the ammonia effect being manifested earlier than the nitrate effect. The activities of peroxisomal serine: gloxylate amino-transferase were always higher with ammonia than nitrate, the two types of nitrogen source, however, had similar effect on conversion rate of glyoxylate into glycine. These results indicate that exogenous ammonia does not act directly as an effector of this aminotransferase in vivo. But changes in the level of the pool size of glycine and serine, both of which are the intermediates of photorespiratory process, suggest that exogenous ammonia inhibit the transformation of serine from glycine metabolically.
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